Univation Technologies, LLC Patent applications |
Patent application number | Title | Published |
20160122270 | PROTECTING PHENOL GROUPS - A method for protecting a phenol group on a precursor compound is provided. The method includes reacting the phenol group with dihydropyran in an acid catalyzed protection reaction and quenching the protection reaction with a strong base within less than about 60 seconds to form a protected precursor compound. | 05-05-2016 |
20160032034 | HAFNOCENE CATALYZED POLYETHYLENE FILMS HAVING RAPID CLING DEVELOPMENT - Polyethylene films may include a polyethylene copolymer polymerized in the presence of a hafnium-based metallocene catalyst, wherein the polyethylene comprises a solubility distribution breadth index (SDBI) less than or equal to 23° C.; a melt index (12) less than 1.5; a flow index (121) of from about 16 to about 28; and a melt flow ratio (121/12) of from about 18 to about 23. The film has a cling value that is at least 60% of a cling value the film has at 48 hours after time zero, and wherein time zero is equal to less than 24 hours. | 02-04-2016 |
20160032025 | LIGANDS FOR CATALYSTS - Catalyst systems and methods for making and using the same. A catalyst system can include a non-metallocene catalyst having the structure: wherein M is a group 4 element, each of R | 02-04-2016 |
20160024238 | MULTIPLE CATALYST SYSTEM COMPRISING METALLOCENES AND TRIDENTATE NITROGEN BASED LIGAND COMPLEXES FOR OLEFIN POLYMERISATION - Catalyst systems and methods for making and using the same are described herein. A catalyst system can include at least three catalysts. The three catalysts include a metallocene catalyst, a first non-metallocene including a ligand complexed to a metal through two or more nitrogen atoms, and a second non-metallocene including a ligand complexed to a metal through one or more nitrogen atoms and an oxygen atom. | 01-28-2016 |
20160024237 | TRIDENTATE NITROGEN BASED LIGANDS FOR OLEFIN POLYMERISATION CATALYSTS - Catalyst systems and methods for making and using the same are provided. A method for forming a polymer catalyst includes reacting a bromoketone compound with an aryl amine compound to form an amide compound. The amide compound is reacted with an ethylene diamine compound, to form a terminal primary amine compound. The terminal primary amine compound is reacted with a bromoaryl compound to form a ligand. | 01-28-2016 |
20150368377 | PREPARATION OF POLYOLEFIN - Catalyst systems and methods for making and using the same are provided. The catalyst systems can include a plurality of silica particles and a metallocene catalyst and an activator supported on the plurality of silica particles. The polymerization catalysts have a particle size distribution in which about 10% of the particles have a size less than about 17 to about 23 micrometers, about 50% of the particles have a size less than about 40 to about 45 micrometers, and about 90% of the particles have a size less than about 72 to about 77 micrometers. | 12-24-2015 |
20150361192 | METHODS FOR PREPARING CATALYST SYSTEMS WITH INCREASED PRODUCTIVITY - Methods for producing catalyst systems with increased productivity are disclosed. The methods may comprise providing a catalyst composition comprising a solvent and a single-site catalyst component, heating an inert gas to a temperature in a range of from about 100° C. to about 150° C., and spray drying the catalyst composition in the presence of the inert gas to form a spray-dried catalyst system. Additionally, the methods may comprise providing a catalyst composition comprising a solvent, an activator, a filler material, a metallocene catalyst, and a Group 15-containing catalyst; heating an inert gas to a temperature in a range of from about 100° C. to about 150° C.; and spray drying the catalyst composition in the presence of the inert gas to form a spray-dried catalyst system. | 12-17-2015 |
20150353651 | PROCESSES FOR MAKING CATALYST COMPOSITIONS HAVING IMPROVED FLOW - This disclosure is directed to processes for producing catalyst compositions having more consistent properties and improved flowability. The processes may involve combining, at a controlled temperature of 30° C. or higher, a metal carboxylate salt with an organic solvent having a dielectric constant at 25° C. of greater than or equal to 3.0 to produce an extracted metal carboxylate salt that is essentially free of carboxylic acids. The extracted metal carboxylate salt may then be combined with a catalyst. | 12-10-2015 |
20150284481 | Recycle Gas Cooler Systems for Gas-Phase Polymerization Processes - Disclosed herein are improvements in recycle gas cooler systems in gas-phase polymerization processes that reduce the tendency for cooler fouling, including a recycle gas cooler system comprising a shell-and-tube heat exchanger. One or more of the tubes of the shell-and-tube heat exchanger may have a flared tube inlet at the tube sheet. The shell-and-tube heat exchanger may also be coupled to a straight inlet pipe having a length that is either at least about 5 times the inner diameter of the straight inlet pipe or at least about 15 feet, whichever is greater. | 10-08-2015 |
20150274859 | Mixed Compatible Ziegler-Natta / Chromium Catalysts for Improved Polymer Products - A catalyst system for polymerizing olefin-based polymers and interpolymers is disclosed. The catalyst system may include a supported chromium catalyst and a Ziegler-Natta catalyst comprising a bulking agent, Mg, and Ti. The Ziegler-Natta catalysts in catalyst systems disclosed herein run exceptionally well without addition of excessive amounts of co-catalyst, thus allowing for use of chromium based supported catalysts that would otherwise be overwhelmed by aluminum alkyl. Further, embodiments disclosed herein may be run without an internal electron donor, and the lack of an internal electron donor in the system also prevents poisoning of the chromium catalysts by the internal electron donor. By including or co-feeding a chromium based catalyst with these Ziegler-Natta catalysts, it has been found that the molecular architecture of the resulting polyolefins, such as polyethylenes, may provide for resins with excellent processing properties. | 10-01-2015 |
20150217949 | Systems and Processes for Storing Resin - Improved systems and processes for storing resins are disclosed herein. These systems and processes are especially useful for reducing the tendency of resins to sinter. In polymerization processes, the improvements disclosed herein can reduce the tendency of resins to sinter while also allowing downstream operations to continue. | 08-06-2015 |
20150210782 | Controlling a Polyolefin Reaction - Methods and systems for controlling a polymerization reaction in a non-sticking regime are disclosed. An exemplary method includes measuring parameters for the polymerization reaction including a reactor temperature and a concentration of an induced condensing agent (ICA) in a polymerization reactor. An equivalent partial pressure ((P | 07-30-2015 |
20150209751 | Method for Determining a Stickiness Temperature of a Resin - Methods and systems for controlling a polymerization reactor in a non-sticking regime are disclosed. An exemplary method includes measuring parameters for the polymerization reaction including a reactor temperature and a concentration of an induced condensing agent (ICA) in a polymerization reactor. An equivalent partial pressure ((PICA)equiv) of the ICA is calculated. The polymerization reactor operation is located in a two dimension space defined by a reactor temperature dimension and a ((PICA)equiv) dimension. The location in the two dimensional space is compared to an non-sticking regime, defined as the space between an upper temperature limit (UTL) curve and a lower temperature limit (LTL) curve. Parameters of the polymerization reactor are adjusted to keep the reactor within the non-sticking regime. | 07-30-2015 |
20150183905 | Methods and Systems for Olefin Polymerization - Methods and systems for olefin polymerization are provided. The method for olefin polymerization can include flowing a catalyst through an injection nozzle and into a fluidized bed disposed within a reactor. The method can also include flowing a feed comprising one or more monomers, one or more inert fluids, or a combination thereof through the injection nozzle and into the fluidized bed. The feed can be at a temperature greater than ambient temperature. The method can also include contacting one or more olefins with the catalyst within the fluidized bed at conditions sufficient to produce a polyolefin. | 07-02-2015 |
20150133615 | Spray-Dried Catalyst Compositions and Polymerization Processes Employing the Same - Spray-dried catalyst compositions comprising a transition metal complex and polymerization processes employing the same are disclosed herein. An embodiment provides a spray-dried catalyst composition comprising a transition metal catalyst component represented by the following formula: (I) and polymerization process employing the same. | 05-14-2015 |
20150133614 | Increased Polymer Melt Flow Ratio Via Feed of a Supported Catalyst Saturated With a Selected Liquid Agent - A process for the production of ethylene alpha-olefin copolymers is disclosed. The process may include feeding a catalyst system comprising a supported metallocene, such as a hafnocene, having pores saturated with a selected liquid agent, to a gas phase polymerization reactor. Ethylene and an alpha-olefin may then be contacted with the supported metallocene in the gas phase polymerization reactor to produce an ethylene alpha-olefin copolymer. The copolymer may have a density of less than 0.93 g/cm | 05-14-2015 |
20150011719 | Methods for Making Catalyst Compositions and Polymer Products Produced Therefrom - Methods for making olefin polymerization catalysts and methods for making polymers using the catalysts are provided. The method for making the catalyst can include combining one or more supports with one or more magnesium-containing compounds under reaction conditions to form a first reacted product. One or more chlorinating compounds selected from the group consisting of aluminum alkyl chlorides and chloro substituted silanes can be combined with the first reacted product under reaction conditions to form a second reacted product. One or more titanium-containing compounds selected from the group consisting of titanium alkoxides and titanium halides can be combined with the second reacted product under reaction conditions to form a catalyst. | 01-08-2015 |
20140378640 | Methods and Systems for Catalyst Delivery - A method for the delivery of a catalyst to a polymerization reactor is disclosed, comprising: contacting a catalyst with a carrier fluid comprising an inert hydrocarbon in gaseous form, the inert hydrocarbon having a normal boiling point of about −1° C. to about 81° C.; and flowing the carrier fluid to the polymerization reactor such that the carrier fluid transports the catalyst to the polymerization reactor. A catalyst delivery system is disclosed, comprising: a catalyst vessel for containing a catalyst; a catalyst injection line for delivering the catalyst to a polymerization reactor, the catalyst injection line being in fluid communication with the catalyst vessel and the polymerization reactor; and a carrier fluid line in fluid communication with the catalyst injection line for delivering a carrier fluid comprising an inert hydrocarbon to the catalyst injection line, the inert hydrocarbon having a normal boiling point of about −1° C. to about 81° C. | 12-25-2014 |
20140350199 | Continuity Additive for Polyolefin Polymerization Processes - A polymerization process is disclosed, including: polymerizing an olefin to form an olefin-based polymer in a polymerization reactor; and introducing a hindered amine light stabilizer to the polymerization reactor. The process may further comprise monitoring static in the polymerization reactor; maintaining the static at a desired level by use of a hindered amine light stabilizer, the hindered amine light stabilizer present in the reactor in the range from about 0.1 to about 500 ppmw, based on the weight of polymer produced by the process. | 11-27-2014 |
20140288249 | Methods for Producing Polyolefins With Catalyst Systems - Described herein are methods comprising contacting one or more olefins with a catalyst system in a polymerization reactor at conditions sufficient to produce a polyolefin, wherein the catalyst system comprises a first metallocene catalyst compound comprising a first transition metal atom, two cyclopentadienyl ligands bound to the first transition metal atom, and two leaving groups bound to the first transition metal atom, wherein at least one leaving group is selected from the group consisting of a halo-phenoxy and a halo-alkoxy; wherein the first metallocene catalyst compound has a catalyst productivity that is at least 20% greater than a comparative metallocene catalyst compound used to produce the same polyolefin, wherein the comparative metallocene catalyst compound is the same as the first metallocene catalyst compound except neither leaving group is a halo-phenoxy or a halo-alkoxy. | 09-25-2014 |
20140200317 | Methods for Reducing Static Charge of a Catalyst and Methods for Using the Catalyst to Produce Polyolefins - Catalysts and methods for making and using the same are provided. The method for fabricating a catalyst may includes contacting a supported catalyst with a monomer under conditions that reduce an overall charge of the catalyst to less than about 75% of an initial charge of the catalyst. A method for polymerization may include introducing a pre-polymerized catalyst and one or more olefins into a gas phase fluidized bed reactor, operating the reactor at conditions sufficient to produce a polyolefin, wherein the polymerization is carried out in the substantial absence of any continuity additives. | 07-17-2014 |
20140179882 | Systems and Methods for Fabricating Polymers - The present invention is broadly directed to various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as gas phase reactor system or liquid phase reactor system. The invention is also broadly directed to various systems in which polymer properties are manipulated by addition of DEALE directly to a polymerization reactor system. | 06-26-2014 |
20140005429 | Processes for the Preparation of Arylamine Compounds | 01-02-2014 |
20130291720 | Systems and Methods for Recovering Hydrocarbons From a Polyolefin Purge Gas Product - Provided are systems and methods for separating a purge gas recovered from a polyethylene product. The method includes recovering a polyethylene product containing one or more volatile hydrocarbons from a polymerization reactor and contacting the polyethylene product with a purge gas to remove at least a portion of the volatile hydrocarbons to produce a polymer product having a reduced concentration of volatile hydrocarbons and a purge gas product enriched in volatile hydrocarbons. The purge gas product is compressed to a pressure of 2,500 kPaa to 10,000 kPaa, and is then cooled and separated into at least a first product, a second product, and a third product. A portion of one or more of the first, second, or third products is then recycled as a purge gas, to the polymerization reactor, or to the purge gas product enriched in volatile hydrocarbons prior to compression, respectively. | 11-07-2013 |
20130267666 | Additive for Polyolefin Polymerization Processes - A polymerization process is disclosed comprising polymerizing an olefin to form an olefin-based polymer in a polymerization reactor; and introducing a polyetheramine additive to the polymerization reactor. The process may further comprise monitoring static in the polymerization reactor; maintaining the static at a desired level by use of a polyetheramine additive, where the polyetheramine additive is present in the reactor in the range from about 0.1 to about 500 ppmw, based on the weight of polymer produced by the process. | 10-10-2013 |
20130253153 | Processes for the Polymerization of Olefins with Extracted Metal Carboxylate Salts - Processes for the polymerization of olefins with extracted metal carboxylate salts are provided. The polymerization processes have increased productivity and/or increased resin bulk density. | 09-26-2013 |
20130245215 | Catalyst Composition Having Improved Flow Characteristics and Methods of Making and Using the Same - Catalyst compositions for the polymerization of olefins having improved flowability properties are provided. | 09-19-2013 |
20130125581 | Ethylene Expansion for Low Temperature Refrigeration in Polyethylene Vent Recovery - Provided are processes and systems for recovering hydrocarbons in a vent stream from a polymerization process. The methods and systems may include the recovery of an olefin monomer from a polymerization vent gas using ethylene refrigeration to condense and recover the olefin monomers from the vent gas. In some embodiments, the methods and systems may also include compression and condensation of polymerization vent gas, recompression of ethylene refrigerant, and use of an expander compressor turbine device for ethylene refrigeration. | 05-23-2013 |
20130116391 | Method and Apparatus for Monitoring and Restoring Electrical Properties of Polymerization Reactor Wall Film - Described herein are methods for monitoring and restoring electrical properties of polymerization reactor wall films. The method may comprise using a reactor wall monitor to monitor and determine an electrical property, such as the bed voltage or breakdown voltage, of the wall film The method may further comprise adding continuity additive to the reactor and/or adjusting the feed rate of continuity additive being added to the reactor in response to the measured electrical property. | 05-09-2013 |
20130115708 | Systems and Methods for Measuring Particle Accumulation on Reactor Surfaces - Systems and methods for monitoring a particle/fluid mixture are provided. The method can include flowing a mixture comprising charged particles and a fluid past a particle accumulation probe. The method can also include measuring electrical signals detected by the probe as some charged particles pass the probe without contacting the probe while other charged particles contact the probe. The measured electrical signals can be manipulated to provide an output. The method can also include determining from the output if the charged particles contacting the probe have, on average, a different charge than the charged particles that pass the probe without contacting the probe. | 05-09-2013 |
20130085289 | Synthesis of Alkyl Cyclopentadiene Compounds - A method of synthesizing an alkyl cyclopentadiene compound is disclosed. The method includes contacting at least one cyclopentadienyl anion source and at least one alkyl group source to form at least one alkyl cyclopentadiene compound. The method further includes extracting the alkyl cyclopentadiene compound with a hydrocarbon solvent. The alkyl cyclopentadiene compound may be converted to a metallocene catalyst compound. | 04-04-2013 |
20130085245 | Methods for Reducing Static Charge of a Catalyst and Methods for Using the Catalyst to Produce Polyolefins - Catalysts and methods for making and using the same are provided. The method for fabricating a catalyst may includes contacting a supported catalyst with a monomer under conditions that reduce an overall charge of the catalyst to less than about 75% of an initial charge of the catalyst. A method for polymerization may include introducing a pre-polymerized catalyst and one or more olefins into a gas phase fluidized bed reactor, operating the reactor at conditions sufficient to produce a polyolefin, wherein the polymerization is carried out in the substantial absence of any continuity additives. | 04-04-2013 |
20130085231 | Polymer Blends and Films Made Therefrom - Polymer blends and films made therefrom are provided. The polymer blend can include a first polyethylene having a density of less than about 0.940 g/cm | 04-04-2013 |
20130035463 | Catalyst Systems And Methods For Using Same To Produce Polyolefin Products - Catalyst systems and methods for making and using the same. The catalyst system can include a single site catalyst compound, a support comprising fluorinated alumina, and an aluminoxane. The aluminoxane can be present in an amount of about 10 mmol or less per gram of the support. | 02-07-2013 |
20120329962 | Methods for Operating a Polymerization Reactor - Methods for shutting down and restarting polymerization in a gas phase polymerization reactor are provided. The method can include introducing a polymerization neutralizer to the reactor in an amount sufficient to stop polymerization therein. The method can also include stopping recovery of a polymer product from the reactor and stopping introduction of a catalyst feed and a reactor feed to the reactor. The method can also include adjusting a pressure within the reactor from an operating pressure to an idling pressure. The method can also include adjusting a superficial velocity of a cycle fluid through the reactor from an operating superficial velocity to an idling superficial velocity. The method can also include maintaining the reactor in an idled state for a period of time. | 12-27-2012 |
20120311884 | Apparatus and Methods for Separating Volatiles from Particulates - Apparatus and methods for separating volatiles from particulates are provided. The apparatus includes a separator having an internal volume and a fluid discharge outlet, a particulate discharge outlet, a particulate inlet, and a fluid inlet disposed on the separator and in fluid communication with the internal volume. The particulate inlet is disposed toward a first end of the separator and the fluid inlet is disposed toward a second end of the separator. The fluid inlet includes one or more openings disposed through a sidewall of the separator. | 12-13-2012 |
20120277092 | Catalyst Compositions And Methods Of Making And Using The Same - Catalyst compositions for the polymerization of olefins having improved flowability properties are provided. | 11-01-2012 |
20120271017 | Catalyst Systems Having a Tailored Hydrogen Response - A polymerization catalyst system and polymerization processes using the catalyst systems are disclosed. The polymerization catalyst systems may include a) a first catalyst compound, and b) a second catalyst compound, wherein the first catalyst compound comprises a biphenyl phenol compound having essentially no hydrogen response. | 10-25-2012 |
20120271015 | Bimetallic Catalyst, Method of Polymerization and Bimodal Polyolefins Therefrom - Bimetallic catalysts, methods of producing bimetallic catalysts comprising a modified Ziegler-Natta catalyst and a metallocene, and methods of olefin polymerization using such catalysts are provided. The method of producing the bimetallic catalyst may include combining (a) a Ziegler-Natta catalyst comprising a Group 4, 5 or 6 metal halide and/or oxide, optionally including a magnesium compound, with (b) a modifier compound (“modifier”), wherein the modifier compound is a Group 13 alkyl compound, to form a modified Ziegler-Natta catalyst. The modified Ziegler-Natta catalyst is preferably non-activated, that is, it is unreactive towards olefin polymerization alone. The molar ratio of the Group 13 metal (of the modifier) to the Group 4, 5 or 6 metal halide and/or oxide may be less than 10:1. The bimetallic catalysts are useful in producing bimodal polymers, particularly bimodal polyethylene, having a Polydispersity (Mw/Mn) of from 12 to 50, which may be used in pipes and films. | 10-25-2012 |
20120252994 | Methods for Making Polyolefin Products Having Different Shear Thinning Properties and Haze - Provided is a method for making a polyolefin comprising contacting one or more olefins in a reactor containing a catalyst; polymerizing the one or more olefins to produce an olefin polymer characterized by a first melt flow ratio (MFR) and a first haze; and altering the reaction temperature in the reactor to shift the first MFR to a MFR that is different than the first MFR and to shift the first haze to a haze that is different than the first haze. | 10-04-2012 |
20120220747 | BIMODAL POLYETHYLENE COMPOSITIONS FOR BLOW MOLDING APPLICATIONS - Bimodal polyethylene compositions and methods for making the same are provided. In at least one specific embodiment, the bimodal polyethylene composition can include a high molecular weight component having a weight average molecular weight (Mw) of from about 400,000 to about 950,000. The bimodal polyethylene composition can also include a low molecular weight component having a weight average molecular weight (Mw) of from about 3,000 to about 100,000. The high molecular weight component can be present in an amount ranging from about 25 wt % to about 40 wt % of the bimodal polyethylene composition. The bimodal polyethylene composition can also have a percent die swell of less than about 80%. | 08-30-2012 |
20120219463 | Catalyst Feed Systems and Methods for Using the Same - Catalyst feed systems and processes utilizing such systems are described herein. Some embodiments disclosed herein relate to a process for improving the flowability of catalyst in a catalyst feed system, including providing a catalyst feed vessel with at least one heat exchange system for maintaining the catalyst system temperature below a critical flow temperature. Also disclosed is a catalyst feed system for the polymerization of olefins including a catalyst feed vessel; and a heat exchange system for maintaining a temperature of a catalyst within the catalyst feed vessel. Additionally disclosed is a process for polymerization of olefins including maintaining a supported catalyst in a catalyst feed vessel below a critical flow temperature of the catalyst; feeding the catalyst to a polymerization reactor; and contacting the catalyst with an olefin to form a polyolefin. | 08-30-2012 |
20120136127 | Polymerization Reaction System - A process for the polymerization of olefins is disclosed. The process may include: feeding a catalyst, a liquid diluent, and an olefin to a polymerization vessel having, from a polymerization vessel bottom to a polymerization vessel top, a vapor introduction zone, a three-phase reaction zone and a vapor disengagement zone; contacting the catalyst and olefin under conditions of temperature and pressure in the presence of the liquid diluent as a continuous phase in the three-phase reaction zone to form a solid phase polyolefin; withdrawing a gas phase composition from an outlet in fluid communication with the vapor disengagement zone; circulating the gas phase composition through a gas circulation loop to an inlet in fluid communication with the vapor distribution zone at a rate sufficient to agitate the solid and liquid phases within the three-phase reaction zone; and withdrawing a reaction mixture comprising polyolefin and diluents from the three-phase reaction zone. | 05-31-2012 |
20120130032 | POLYMERIZATION PROCESS USING A SUPPORTED CONSTRAINED GEOMETRY CATALYST - A polymerization process includes contacting the following in a gas-phase reactor system under polymerization conditions for making a polymer product: a metallocene-based catalyst system including a supported constrained geometry catalyst, at least one monomer, and an additive selected from a group consisting of an aluminum distearate, an ethoxylated amine, and a mixture thereof. The additive may be selected from a group consisting of an aluminum distearate, an ethoxylated amine, polyethylenimines, and other additives suitable for use in the production of polymers for food contact applications and end products, including a mixture of a polysulfone copolymer, a polymeric polyamine, and oil-soluble sulfonic acid, in a carrier fluid, and mixtures thereof. | 05-24-2012 |
20120070575 | METHODS FOR APPLYING SOLUTION CATALYSTS TO REACTOR SURFACES - A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally (where a catalyst component of the solution catalyst comprises at least one chromium containing compound) oxidizing at least some of the applied chromium containing compound in a controlled manner. | 03-22-2012 |
20120065054 | Catalyst Systems and Polymerization Processes - A method of polymerizing olefins with catalyst systems, such as, for example, a multimodal catalyst system, wherein the catalyst system is stored at a controlled temperature to minimize loss of catalyst system productivity. | 03-15-2012 |
20120046428 | Mixed Metal Catalyst Systems Having a Tailored Hydrogen Response - A polymerization catalyst system and polymerization processes using the catalyst systems are disclosed. The polymerization catalyst systems may include a) a first catalyst compound, and b) a second catalyst compound, wherein the first catalyst compound includes an oxadiazole-containing compound. In some embodiments, the oxadiazole-containing compound has essentially no hydrogen response, thus allowing better and/or tailored control of product properties when producing polymers using the catalyst system. | 02-23-2012 |
20120041164 | Methods of Controlling Polymer Properties - The invention generally provides for methods for controlling polymer properties. In particular, invention provides for methods for controlling the comonomer composition distribution of polyolefins such as ethylene alpha-olefin copolymers by altering at least one or more of the following parameters: the molar ratio of hydrogen to ethylene, the molar ratio of comonomer to ethylene, the partial pressure of ethylene, and the reactor temperature without substantially changing the density and/or the melt index of the copolymer. | 02-16-2012 |
20120041159 | Systems and Methods for Monitoring a Polymerization Reaction - Systems and methods for monitoring a polymerization reactor are provided. The method can include estimating an acoustic condition of a polymer produced in a reactor. The method can also include estimating a stickiness control parameter of the polymer produced in the reactor. The method can further include pairing the acoustic condition with the stickiness control parameter to provide a paired acoustic condition and stickiness control parameter. | 02-16-2012 |
20120039755 | Methods and Devices for Polymerization - A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall. | 02-16-2012 |
20120024324 | Regeneration of Purification Beds with a Jet Compressor in an Open Loop Cycle - Methods and systems for regenerating a purification bed take advantage of inert gas pressure, such as, for example, supplied by a pipeline. The inert gas ( | 02-02-2012 |
20110294973 | Method for Seed Bed Treatment for a Polymerization Reaction - A method for preparing a reactor for performance of a polymerization reaction, the method including providing at least one seed bed into the reactor; wherein the at least one seed bed includes at least one organometallic compound and polymer particles. | 12-01-2011 |
20110275772 | Method for Controlling Bimodal Catalyst Activity During Polymerization - A method of performing a polymerization reaction in a gas phase polymerization reactor to produce a bimodal polymer while controlling activity of a bimodal polymerization catalyst composition in the reactor by controlling concentration of at least one induced condensing agent (‘ICA’) in the reactor is provided. In some embodiments, the ICA is isopentane (or another hydrocarbon compound) and the bimodal catalyst composition includes a Group 15 and metal containing catalyst compound (or other HMW catalyst for catalyzing polymerization of a high molecular weight fraction of the product), and a metallocene catalyst compound (or other LMW catalyst for catalyzing polymerization of a low molecular weight fraction of the product). | 11-10-2011 |
20110256632 | Additive for Polyolefin Polymerization Processes - A polymerization process is disclosed, including: polymerizing at least one olefin to form an olefin based polymer in a polymerization reactor; and feeding at least one ethyleneimine additive to the polymerization reactor. The ethyleneimine additive may comprise a polyethyleneimine, an ethyleneimine copolymer, or a mixture thereof. The process may further comprise monitoring static in the polymerization reactor; maintaining the static at a desired level by use of at least one ethyleneimine additive, the at least one ethyleneimine additive present in said reactor in the range from about 0.1 to about 50 ppm, based on the weight of polymer produced by said combining. | 10-20-2011 |
20110237855 | Integrated Hydrocarbons Feed Stripper and Method of Using the Same - Systems and methods for removing a volatile catalyst poison from a liquid hydrocarbon are provided. In one embodiment, a process vent ( | 09-29-2011 |
20110237763 | Systems and Methods for Fabricating Polymers - Disclosed herein are various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods comprise manipulating properties of polymers produced by adjusting the hydrogen feed rate. | 09-29-2011 |
20110232768 | Slurry Catalyst Flow Splitters and Methods of Using the Same - A system for feeding a slurry catalyst composition including: a primary slurry feed system comprising a primary slurry flow meter and a primary catalyst injection device, wherein the primary slurry flow meter measures a primary slurry catalyst composition flow rate to the primary catalyst injection device; and a secondary slurry feed system comprising a secondary slurry flow meter, a secondary carrier liquid, a secondary carrier liquid control device, and a secondary catalyst injection device, wherein the secondary slurry flow meter measures a secondary slurry catalyst composition flow rate to the secondary catalyst injection device, wherein the secondary carrier liquid control device controls a process parameter of the secondary slurry feed system based a ratio of the primary slurry catalyst composition flow rate to the secondary slurry catalyst composition flow rate. | 09-29-2011 |
20110219952 | Systems Using Mass Flow Promoting Insert with Gas Purging and Methods Thereof - A system in one embodiment includes a barrier; an inverted cone in the barrier; and a member under the inverted cone and having dimensions that cause solids passing therealong between the member and the barrier to have about a constant velocity profile thereacross. A method for purging a gas from a solid/gas mixture according to one embodiment includes adding solids to a barrier having an inverted cone therein and a member under the inverted cone, wherein the solids passing along the member have about a constant vertical velocity profile thereacross; and injecting a purge gas into the solids from at least one point adjacent the member. | 09-15-2011 |
20110218307 | Systems and Methods for Fabricating Polymers - The present invention is broadly directed to various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as gas phase reactor system or liquid phase reactor system. The invention is also broadly directed to various systems in which polymer properties are manipulated by addition of DEALE directly to a polymerization reactor system. | 09-08-2011 |
20110207599 | Processes for the Preparation of Arylamine Compounds - A process for the preparation of N-arylamine compounds, the process including: reacting a compound having an amino group with an acylating compound in the presence of a base and a transition metal catalyst under reaction conditions effective to form an N-arylamine compound; wherein the transition metal catalyst comprises a complex of a Group 8-10 metal and at least one chelating ligand comprising (R)-(−)-1-[(S)-2-dicyclohexylphosphino]-ferrocenyl]ethyldi-t-butylphosphine. | 08-25-2011 |
20110198197 | Polymer Finishing Process - A polymer finishing process including: recovering polymer powder from a polymerization reactor; feeding the polymer powder to an inlet of a mass flow screw conveyor and one or more mass measuring devices for determining a mass of polymer powder within at least a portion of the mass flow screw conveyor; measuring at least one of a mass of the polymer powder in the screw conveyor and a combined mass of the screw conveyor and the polymer powder within the screw conveyor with the one or more mass measuring devices; and determining a mass flowrate of polymer powder through the mass flow screw conveyor based on the at least one of the measured mass of the polymer powder in the mass flow screw conveyor and the measured combined mass. A method of controlling a polymerization process using a mass flow screw conveyor is also disclosed. | 08-18-2011 |
20110196112 | Methods for Cleaning the Distributor Plate in a Fluidized Bed Reactor System - A method for cleaning a distributor plate in a fluidized bed polymerization reactor system according to one embodiment includes, in a first mode, operating with about a normal, baseline value of superficial gas velocity in a fluidized bed polymerization reactor system having a reactor vessel, a recycle line, and a distributor plate in the reactor vessel near an inlet of the reactor vessel. In a second mode, the superficial gas velocity is increased above the baseline value of the first mode to a level sufficient to raise the temperature of the cycle gas at the inlet above an average temperature of the cycle gas at the inlet in the first mode, and to a level sufficient to dislodge foulant from holes in the distributor plate. | 08-11-2011 |
20110184138 | Catalyst and Compositions and Methods of Making and Using the Same - Catalyst compositions for the polymerization of olefins having improved flowability properties are provided. | 07-28-2011 |
20110184132 | Catalyst Compositions Comprising Support Materials Having an Improved Particle-Size Distribution - A catalyst composition that includes a support material having an improved particle-size distribution is provided. Processes for producing polyolefin composition also are provided. Polymers and films also are provided. An example of a catalyst composition is a supported multi-transition-metal catalyst composition that includes: (a) at least two catalyst components selected from the group consisting of: a nonmetallocene catalyst component and a metallocene catalyst component; (b) a support material that has a D | 07-28-2011 |
20110184131 | Circulating Fluidized Bed Reactor - A continuous gas phase circulating bed reactor, including: a riser for contacting a catalyst and a first gas composition comprising an olefin to form a polyolefin under fast-fluidization regime or a dilute-phase pneumatic conveying regime conditions; a downer for contacting the catalyst and a second gas composition comprising an olefin to form additional polyolefin under fast fluidization regime or a dilute-phase pneumatic conveying regime conditions; and a transport section for conveying at least a portion of the catalyst, polyolefin, and additional polyolefin from the downer to the riser. Also disclosed is a polymerization process using such a circulating bed reactor. | 07-28-2011 |
20110124826 | METHOD OF USING AN UPPER DISCHARGE IN A FLUIDIZED BED REACTOR AND SYSTEM THEREOF - A method according to one embodiment includes operating a reactor or providing a reactor after operation, wherein the reactor includes a bottom section, a bed section above the bottom section, a distributor plate between the bottom section and the bed section, an expanded section above the bed section, and an upper section above the bed section, wherein the bed section has a height H measured from the distributor plate to the expanded section; measuring a concentration of particulates in the upper section of the reactor to obtain a first determined level of particulates in the upper section; and discharging at least some of the particulates from the reactor at an upper discharge point located above 0.55H as measured vertically from the distributor plate based on the first determined level. Additional systems and methods are also provided. | 05-26-2011 |
20110118417 | Polyethylene Compositions - Provided are various compositions, including but not limited to a bimodal polyethylene composition having a density of 0.940 g/cc or more, the composition comprising a high molecular weight polyethylene component and a low molecular weight polyethylene component, wherein the composition qualifies as a PE 100 material such that in accordance with ISO 1167 a pipe formed from the composition that is subjected to internal pipe resistance has an extrapolated stress of 10 MPa or more when the internal pipe resistance curve is extrapolated to 50 or 100 years in accordance with ISO 9080:2003(E), and wherein the melt strength is greater than 18 cN. | 05-19-2011 |
20110098422 | POLYETHYLENE COMPOSITIONS HAVING IMPROVED PROPERTIES - Polyethylene compositions having improved properties are provided. In one aspect, a polyethylene composition having a long chain branching index (g′ | 04-28-2011 |
20110088787 | Slurry Catalyst Flow Splitters and Methods of Using the Same - A system for feeding a slurry catalyst composition including: a primary slurry feed system comprising a primary slurry flow meter and a primary catalyst injection device, wherein the primary slurry flow meter measures a primary slurry catalyst composition flow rate to the primary catalyst injection device; and a secondary slurry feed system comprising a secondary slurry flow meter, a secondary carrier liquid, a secondary carrier liquid control device, and a secondary catalyst injection device, wherein the secondary slurry flow meter measures a secondary slurry catalyst composition flow rate to the secondary catalyst injection device, wherein the secondary carrier liquid control device controls a process parameter of the secondary slurry feed system based a ratio of the primary slurry catalyst composition flow rate to the secondary slurry catalyst composition flow rate. | 04-21-2011 |
20110086990 | Ethylene-Alpha Olefin Copolymers and Polymerization Processes for Making the Same - A process for the production of an ethylene alpha-olefin copolymer is disclosed. The process includes polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure of from 0.7 to 70 bar and a reactor temperature of from 20° C. to 150° C. to form an ethylene alpha-olefin copolymer. The resulting ethylene alpha-olefin copolymer may have a density of 0.927 g/cc or greater and environmental stress crack resistance (ESCR) of 500 hr or more when measured according to ASTM 1693/B in 10% Igepal. | 04-14-2011 |
20110085408 | High Speed and Direct Driven Rotating Equipment for Polyolefin Manufacturing - An apparatus and method for melting polymer is provided. In at least one embodiment, the apparatus includes a housing, two or more rotatable members at least partially contained within the housing, where each rotatable member having a shaft coupled thereto. The apparatus also includes a motor having a drive shaft directly coupled to the shaft of the rotatable members such that the rotatable members rotate at a speed of the motor drive shaft. The rotatable members are preferably non-intermeshing and counter-rotating. | 04-14-2011 |
20110077370 | CONTINUITY ADDITIVES AND THEIR USE IN POLYMERIZATION PROCESSES - The invention relates to catalyst compositions including at least one catalyst compound and at least one continuity additive such as poly-oxo-metal carboxylate compound and their use in the polymerization of olefins. | 03-31-2011 |
20110060111 | Production of Polyethylene - The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possessing desirable productivities, and may be applied to the catalyst directly or separately to the reactor. Adding the alkyl aluminum compound directly to the reactor (in-situ) eliminates induction times. | 03-10-2011 |
20110040041 | Polymerization Processes Using Metallocene Catalysts, Their Polymer Products and End Uses - A process for the production of an ethylene alpha-olefin copolymer is disclosed, the process including polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure of from 0.7 to 70 bar and a reactor temperature of from 20° C. to 150° C. to form an ethylene alpha-olefin copolymer. The resulting ethylene alpha-olefin copolymer may have a density D of 0.927 g/cc or less, a melt index (I | 02-17-2011 |
20110034657 | Reactor Systems and Processes for Using the Same - A process for the polymerization of olefin's, including: introducing an olefin and a polymerization catalyst into a polymerization reactor to form a polyolefin, the polymerization reactor including: a fluidized bed region having a top and a bottom; and a motive bed region; wherein a first end of the motive bed region is fluidly connected to the top of the fluidized bed region; and wherein a second end of the motive bed region is fluidly connected to the bottom of the fluidized bed region; and wherein a diameter of the fluidized bed region is greater than a diameter of the motive bed region; circulating at least a portion of the olefin, the catalyst, and the polyolefin through the fluidized bed region and the motive bed region; maintaining a dense-phase fluidized bed within the fluidized bed region; recovering polyolefin from the fluidized bed region, is provided. A reactor system directed to the process is also provided. | 02-10-2011 |
20110034324 | Methods for Preparing Catalyst Systems - A process to prepare a catalyst composition that includes combining catalyst precursors in a recycled organic reaction solvent; allowing the catalyst precursors to react to form a catalyst compound; and separating the formed catalyst compound from the reaction solvent is disclosed. | 02-10-2011 |
20110027156 | Systems and Methods for Removing Impurities From a Feed Fluid - Systems and methods for removing impurities from a feed fluid in a single vessel. A method generally includes, in single vessel, contacting a feed fluid passing through the vessel with a copper-based material for removing oxygen from the feed fluid; and contacting the feed fluid passing through the vessel with an adsorbent for removing at least one of water, carbon dioxide, and oxygenated hydrocarbons from the feed fluid. | 02-03-2011 |
20110010938 | Modified Chromium-Based Catalysts and Polymerization Processes for Using the Same - Embodiments disclosed herein generally relate to olefin polymerization catalysts, and more specifically to chromium-based catalysts and methods of use of chromium-based catalysts for the production of polyolefins, and even more specifically to methods for controlling or tailoring the flow index response of chromium-based catalysts through the controlled addition of a reducing agent to the catalysts under controlled mixing conditions. | 01-20-2011 |
20100324233 | Catalyst Feed Systems and Methods for Using the Same - Catalyst feed systems and processes utilizing such systems are described herein. Some embodiments disclosed herein relate to a process for improving the flowability of catalyst in a catalyst feed system, including providing a catalyst feed vessel with at least one heat exchange system for maintaining the catalyst system temperature below a critical flow temperature. Also disclosed is a catalyst feed system for the polymerization of olefins including a catalyst feed vessel; and a heat exchange system for maintaining a temperature of a catalyst within the catalyst feed vessel. Additionally disclosed is a process for polymerization of olefins including maintaining a supported catalyst in a catalyst feed vessel below a critical flow temperature of the catalyst; feeding the catalyst to a polymerization reactor; and contacting the catalyst with an olefin to form a polyolefin. | 12-23-2010 |
20100298511 | METALLOCENE CATALYSTS AND THEIR USE IN POLYMERIZATION PROCESSES - A process for polymerizing olefin(s) utilizing a cyclic bridged metallocene catalyst system to produce polymers with improved properties is provided. The catalyst system may include a cyclic bridged metallocene, L | 11-25-2010 |
20100292416 | METHODS AND APPARATUS FOR POLYMERIZATION - Apparatus and methods for olefin polymerization are provided. A fluidized bed reactor may include a cylindrical section, a dome, a transition section between the cylindrical section and the dome, at least three outlet nozzles disposed on the dome, and a recycle line in fluid communication with the at least three outlet nozzles. | 11-18-2010 |
20100291334 | Broad Molecular Weight Polyethylene Having Improved Properties - Disclosed herein is a polyolefin polymer having improved properties wherein the polymer is produced using a chromium based catalyst in combination with aluminum alkyl activators and co-catalysts. Also disclosed is a pipe comprising the inventive polymer and a film comprising the inventive polymer, each having improved properties over those known in the art. | 11-18-2010 |
20100289482 | Method and Apparatus for Monitoring Electrical Properties of Polymerization Reactor Wall Film - Disclosed is a method for using at least one static probe during polymerization in a fluid bed polymerization reactor system to monitor a coating on a surface of the reactor system and a distal portion of each static probe, wherein the coating is exposed to flowing fluid within the reactor system during the reaction. The surface may be a reactor bed wall (exposed to the reactor's fluid bed) and the coating is exposed to flowing, bubbling fluid within the fluid bed during the reaction. The method may include steps of: during the polymerization reaction, operating the static probe to generate a sequence of data values (“high speed data”) indicative of fluid flow variation (e.g., bubbling or turbulence), and determining from the high speed data at least one electrical property of the coating (e.g., of a portion of the coating on the distal portion of the static probe). | 11-18-2010 |
20100286346 | Method for On-Line Determination of Degree or Onset of Resin Stickiness Using Acoustic Data - Provided is a method for monitoring a polymerization reaction in a fluid bed reactor to determine in on-line fashion a current value, and preferably also a limiting value, of a stickiness control temperature, and optionally controlling the reaction in response thereto in an effort to prevent occurrence of a discontinuity event. The stickiness control temperature is a temperature indicative of a characteristic of melting behavior of polymer resin in the reactor, and may be indicative of occurrence of resin sheeting or another discontinuity event. Optionally, a predetermined relation between values of acoustic energy in the reactor and values of a stickiness control temperature is used to provide error checking for determination of the stickiness control temperature, or a current value of the stickiness control temperature is determined from acoustic data and a predetermined relation between values of an acoustic condition in the reactor and values of the stickiness control temperature. | 11-11-2010 |
20100282075 | Systems and Methods for Removing Entrained Particulates from Gas Streams, and Reactor Systems - Various methods and systems for removing particulates from a cycle gas stream, e.g., in a reactor system, are provided. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as a gas-phase reactor system for production of polyolefin polymers. The methods comprise the step of compressing a gas stream having particulates entrained therein. | 11-11-2010 |
20100264243 | Separator Rotary Feeder and Method of Using the Same - A rotary feeder for feeding a particulate material including: a cylindrical housing comprising a feeder inlet, a first feeder outlet, and a second feeder outlet; a rotor mounted in the cylindrical housing including a plurality of substantially impeller blades defining a plurality of circumferentially spaced pockets alignable with the feeder inlet, first feeder outlet, and second feeder outlet, and adapted to sweep a wall of the cylindrical housing as the rotor rotates in the cylindrical housing; a device for rotating the rotor; and a separating screen in the first feeder outlet to substantially prevent oversize material from exiting through the first feeder outlet, wherein each of the plurality of circumferentially spaced pockets will align with the feeder inlet to receive therein a particulate material and an oversize material through the feeder inlet, rotate in the cylindrical housing to align with the first feeder outlet and discharge the particulate material therefrom, and rotate in the cylindrical housing to align with the second feeder outlet after alignment with the first feeder outlet and discharge the oversized material therefrom is provided as well as a method of using the same. | 10-21-2010 |
20100261856 | METHODS FOR THE REMOVAL OF IMPURITIES FROM POLYMERIZATION FEED STREAMS - Methods for the removal of impurities, for example, carbon monoxide, from a polymerization feed streams are provided. | 10-14-2010 |
20100234547 | Polymerization Catalysts, Methods of Making, Methods of Using, and Polyolefin Products Made Therefrom - Olefin polymerization catalyst systems including a high molecular weight catalyst compound and a low molecular weight catalyst compound, and methods of making same are provided. High molecular weight catalysts include metallocene catalysts and low molecular weight catalysts include non-metallocene compounds including biphenyl phenol compounds. Generally catalyst systems may include less than about 5.0 mol % of the high molecular weight catalyst compound relative to said low molecular weight catalyst. Methods for olefin polymerization including the aforementioned catalyst systems, and polyolefins and products made therefrom. | 09-16-2010 |
20100184927 | METHODS FOR APPLYING SOLUTION CATALYSTS TO REACTOR SURFACES - A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally (where a catalyst component of the solution catalyst comprises at least one chromium containing compound) oxidizing at least some of the applied chromium containing compound in a controlled manner. | 07-22-2010 |
20100164133 | Oxygen Tailoring of Polyethylene Resins - A process is provided for extruding a bimodal polyethylene resin. The process includes providing a polyethylene homopolymer or copolymer resin having a bimodal molecular weight distribution; conveying the resin through an extruder having a feed zone in which the resin is not melted, a melt-mixing zone in which at least a portion of the resin is melted, and a melt zone in which the resin is in a molten state, each zone being partially filled with the resin; and contacting the molten resin in the melt zone with a gas mixture of 8 to 40% by volume O | 07-01-2010 |
20100160580 | Blow molding Polyethylene Resins - Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 105° C. or less to produce a polyethylene copolymer having a density of 0.945 g/cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700° C. or less, and include silica, chromium, and titanium. | 06-24-2010 |
20100144989 | METHODS OF CONTROLLING POLYMER PROPERTIES - The invention generally provides for methods for controlling polymer properties. In particular, invention provides for methods for controlling the comonomer composition distribution of polyolefins such as ethylene alpha-olefin copolymers by altering at least one or more of the following parameters: the molar ratio of hydrogen to ethylene, the molar ratio of comonomer to ethylene, the partial pressure of ethylene, and the reactor temperature without substantially changing the density and/or the melt index of the copolymer. | 06-10-2010 |
20100144983 | Methods for determining temperature value indicative of resin stickiness from data generated by polymerization reaction monitoring - In some embodiments, a method including the steps of monitoring a polymerization reaction which produces a polymer resin in a fluid bed reactor, where a dry melt reference temperature is characteristic of melting behavior of a dry version of the resin, and in response to data indicative of at least one monitored parameter of the reaction, determining in on-line fashion a reduced melt reference temperature that is at least substantially equal to the difference between the dry melt reference temperature and a temperature by which the dry melt reference temperature is depressed by the presence of condensable diluent gas with the resin in the reactor. Optionally, the method also includes the step of controlling the reaction in response to the reduced melt reference temperature or a stickiness parameter determined from the reduced melt reference temperature. | 06-10-2010 |
20100144981 | METHOD FOR REDUCING AND/OR PREVENTING PRODUCTION OF EXCESSIVELY LOW DENSITY POLYMER PRODUCT DURING POLYMERIZATION TRANSITIONS - A method for controlling a transition from an initial polymerization reaction to a target polymerization reaction in a manner that reduces significantly the amount of off-grade product having excessively low density produced during the transition, including steps of: during the transition, maintaining a first one of a concentration ratio and a feed ratio at an at least substantially constant value while implementing process changes in an effort to bring produced polymer into compliance with a target specification set and monitoring (without controlling) the other one of the concentration ratio and the feed ratio to generate first data; and during the transition, determining from the first data whether polymer having excessively low density is likely to be produced during the transition, and upon determining that polymer having excessively low density is likely to be produced during the transition, maintaining during the remaining portion of the transition the other ratio at a value that is at least substantially constant while allowing the first ratio to vary is provided. | 06-10-2010 |
20100143207 | SEMI-CONDUCTIVE COATINGS FOR A POLYOLEFIN REACTION SYSTEM - A method for selecting a semi-conductive coating to be applied to at least a portion of an inner surface of a polyolefin reaction system wherein the coating has certain electrical properties and a fluidized bed reactor vessel wherein at least a portion of a reactor internal surface is coated with a semi-conductive coating is provided. | 06-10-2010 |
20100140301 | PARTICULATE SOLIDS INJECTOR - An apparatus for feeding a dry particulate solid into a pressurized vessel including: a solids reservoir; a rotating metering disc below the solids reservoir; a non-rotating component adjacent to the metering disc; a surface of contact between the metering disc and the non-rotating component, wherein the surface of contact comprises a low friction material; a drive shaft, a drive motor; a pickup section; and an injection tube is provided. | 06-10-2010 |
20100137533 | HINDERED POLYALICYCLIC ALKYL CATALYSTS AND THEIR USE IN A GAS-PHASE POLYMERIZATION REACTOR - Embodiments of the present invention include a method of polymerizing olefins comprising contacting olefins with a catalyst composition made by the process of combining a hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form a catalyst composition. Embodiments of the present invention also include catalyst compositions comprising a hindered polyalicyclic alkyl catalyst precursor made by the process of combining the hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form the catalyst composition. In one embodiment, the hindered polyalicyclic alkyl catalyst precursor is formed by first combining an acid, a compound having the formula RX, and a metal oxide selected from the group consisting of Group 3 to Group 10 oxide compounds to produce a catalyst precursor; characterized in that R is selected from the group consisting of hindered polyalicyclic alkyls, and substituted derivatives thereof, and X is selected from the group consisting of any suitable leaving group. | 06-03-2010 |
20100133714 | BIMODAL POLYETHYLENE COMPOSITIONS FOR BLOW MOLDING APPLICATIONS - Bimodal polyethylene compositions and methods for making the same are provided. In at least one specific embodiment, the bimodal polyethylene composition can include a high molecular weight component having a weight average molecular weight (Mw) of from about 400,000 to about 950,000. The bimodal polyethylene composition can also include a low molecular weight component having a weight average molecular weight (Mw) of from about 3,000 to about 100,000. The high molecular weight component can be present in an amount ranging from about 25 wt % to about 40 wt % of the bimodal polyethylene composition. The bimodal polyethylene composition can also have a percent die swell of less than about 80%. | 06-03-2010 |
20100105849 | SYSTEMS AND METHODS FOR FABRICATING POLYOLEFINS - Various methods and systems for using oxygen in a polyolefin polymerization reactor system are provided. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as a gas-phase reactor system. | 04-29-2010 |
20100093954 | POLYMERIZATION PROCESS - The invention relates to a polymerization process, the polymerization process includes contacting
| 04-15-2010 |
20100076164 | METHODS AND DEVICES FOR POLYMERIZATION - A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall. | 03-25-2010 |
20100063227 | CATALYST SYSTEMS AND POLYMERIZATION PROCESSES - A method of polymerizing olefins with catalyst systems, such as, for example, a multimodal catalyst system, wherein the catalyst system is stored at a controlled temperature to minimize loss of catalyst system productivity. | 03-11-2010 |
20100022720 | POLYMERIZATION MONITORING AND METHOD OF SELECTING LEADING INDICATORS - Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of rapidly monitoring and controlling polymerization reactions without the need to sample and test the polymer properties. The method uses reactor control data and material inventory data in a mathematical leading indicator function to control the reactor conditions, and thereby the products produced under those conditions. | 01-28-2010 |
20100010179 | DE-FOAMING SPRAY DRIED CATALYST SLURRIES - A method for preparing a spray dried catalyst and a low viscosity, low foam spray dried catalyst system for olefin polymerization are provided. In one aspect, the method includes preparing a catalyst system including one or more components selected from metallocenes, non-metallocenes, and activators, adding mineral oil to the catalyst system to form a slurry, and adding one or more liquid alkanes having three or more carbon atoms to the slurry in an amount sufficient to reduce foaming and viscosity of the slurry. In one aspect, the catalyst system includes one or more catalysts selected from metallocenes, non-metallocenes, and a combination thereof, wherein the catalyst system is spray dried. The system further includes mineral oil to form a slurry including a catalyst system, and one or more liquid alkanes having three or more carbon atoms in an amount sufficient to reduce foaming and viscosity of the slurry. | 01-14-2010 |
20090312506 | PRODUCTION OF POLYETHYLENE - The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possessing desirable productivities, and may be applied to the catalyst directly or separately to the reactor. Adding the alkyl aluminum compound directly to the reactor (in-situ) eliminates induction times. | 12-17-2009 |
20090258995 | HIGH DENSITY POLYETHYLENE AND ARTICLES MADE THEREFROM - Articles such as, for example, pipes or bottles, prepared from multimodal polyethylenes possessing a density from 0.940 to 0.965 g/cm | 10-15-2009 |
20090215970 | Blow Molding Polyethylene Resins - Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 120° C. or less to produce a polyethylene copolymer having a density of 0.945 g/cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700° C. or less, and include silica, chromium, and titanium. | 08-27-2009 |
20090082195 | Olefin polymerization catalysts - A catalyst composition and method for olefin polymerization are provided. In one aspect, the catalyst composition is represented by the formula α | 03-26-2009 |
20090036610 | Enhanced ESCR Bimodal HDPE for blow molding applications - Bimodal polyethylene compositions and blow molded bottles made therefrom are provided. In at least one specific embodiment, the composition includes at least one high molecular weight polyethylene component having a molecular weight distribution (MWD) of about 6 to about 9, a short chain branch content of less than about 2 branches per 1,000 main chain carbons, and a Mz of about 1,100,000 or more. The composition also includes at least one low molecular weight polyethylene component where a ratio of weight average molecular weight of the high molecular weight polyethylene component to weight average molecular weight of the low molecular weight polyethylene component is about 20 or less. The polyethylene composition has a density of about 0.94 g/cc or more, an ESCR of about 600 hours or more, a percent die swell of about 70% or more, and may comprise at least 70% ethylene-derived units. | 02-05-2009 |
20080319583 | Method for on-line monitoring and control of polymerization processes and reactors to prevent discontinuity events - Generally, a method of monitoring a polymerization reaction in a fluid bed reactor to generate, in on-line fashion, data indicative of the imminent occurrence of a discontinuity event (for example, sheeting) and optionally also control the reaction to prevent the occurrence of the discontinuity event is provided. Typical embodiments include the steps of generating in on-line fashion at least one of bed static data indicative of static charge in the fluidized bed and carryover static data indicative of carryover static; and generating at least one of temperature data (in on-line fashion using at least one monitored reaction parameter) indicative of a first temperature and acoustic emission data indicative of resin stickiness in the reactor, where the first temperature is indicative of at least one of degree of resin stickiness in the reactor and a characteristic of melting behavior of polymer resin in the reactor in the presence of at least one diluent. | 12-25-2008 |
20080312380 | Bimodal polyethylene compositions for blow molding appplications - A bimodal polyethylene composition that includes ethylene-derived units, and, optionally, one or more other olefin-derived units, wherein the bimodal polyethylene composition possesses a density of at least 0.940 g/cc, an average molecular weight (Mw) of from 200,000 to 370,000, a z-average molecular weight (Mz) of from 1,500,000 to 3,400,000 Daltons, and a z+1 average molecular weight (Mz+1) of from 2,500,000 to 6,800,000 Daltons, is provided in various embodiments. Articles made therefrom and methods of making the same are also provided. | 12-18-2008 |
20080293895 | Polymerization process using a supported, treated catalyst system - The present invention relates to a supported, treated catalyst system and its use in a process for polymerizing olefin(s). More particularly, it provides a supported, treated catalyst system produced by a process comprising the steps of: (a) forming a supported bimetallic catalyst system comprising a first catalyst component and a metallocene catalyst compound; and (b) contacting the supported bimetallic catalyst system of (a) with at least one methylalumoxane-activatable compound. | 11-27-2008 |
20080242821 | Hindered polyalicyclic alkyl catalysts and their use in a gas-phase polymerization reactor - Embodiments of the present invention include a method of polymerizing olefins comprising contacting olefins with a catalyst composition made by the process of combining a hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form a catalyst composition. Embodiments of the present invention also include catalyst compositions comprising a hindered polyalicyclic alkyl catalyst precursor made by the process of combining the hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form the catalyst composition. In one embodiment, the hindered polyalicyclic alkyl catalyst precursor is formed by first combining an acid, a compound having the formula RX, and a metal oxide selected from the group consisting of Group 3 to Group 10 oxide compounds to produce a catalyst precursor; characterized in that R is selected from the group consisting of hindered polyalicyclic alkyls, and substituted derivatives thereof, and X is selected from the group consisting of any suitable leaving group. | 10-02-2008 |
20080214753 | Catalyst systems and their use in polymerization processes - A catalyst system comprising a hafnocene catalyst compound and zirconocene catalyst compound, wherein the hafnocene and/or zirconocene include(s) at least one ligand substituted with at least one linear or iso alkyl group having 3 or more carbon atoms is provided. A process for polymerizing olefin(s) using the same catalyst system is also provided. | 09-04-2008 |
20080214388 | Methods to prepare catalyst compositions comprising small silica support materials - Methods are provided to prepare a catalyst system that includes at least one titanium compound, at least one magnesium compound, at least one electron donor compound, at least one activator compound, and at least one silica support material, the at least one silica support material having a median particle size in the range of from 20 to 50 microns with no more than 10% of the particles having a size less than 10 microns and no more than 10% of the particles having a size greater than 50 microns and average pore diameter of at least ≧220 angstroms. | 09-04-2008 |
20080214385 | Catalyst composition and methods for its preparation and use in a polymerization process - The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carboxylate metal salt. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier. More particularly, the polymerization catalyst comprises a bulky ligand metallocene-type catalyst system. | 09-04-2008 |