Patent application number | Description | Published |
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 |
20090018279 | Method for controlling sheeting in gas phase reactors - Embodiments of the present invention relate to measuring and controlling static in a gas phase reactor polymerization. In particular, embodiments relate to monitoring carryover static in an entrainment zone during gas phase polymerization to determine the onset of reactor discontinuity events such as chunking and sheeting. Embodiments also relate to monitoring carryover static to determine the need for effective additions of continuity additives that minimize reactor static activity and thereby preventing discontinuity events. | 01-15-2009 |
20090216481 | Method and System for Assessing Reactor Fluidization Quality and Operability From Frequency Spectrum of Temperature Data - In some embodiments, a method or system for assessing fluidization quality of a fluidized bed reactor, including by: (a) generating at least one set of temperature data indicative of temperature at a location within the reactor as a function of time during operation of the reactor; (b) generating transformed data by performing a Fourier transform on each said set of temperature data; (c) generating filtered, transformed data by high-pass filtering the transformed data to remove low frequency components thereof (preferably including the frequency component whose frequency is the natural frequency of the cooling control loop); and (d) determining at least one indication of the fluidization quality from the filtered, transformed data. In some embodiments, the reactor has a cooling control loop having a natural frequency and the frequency components removed during step (c) include a frequency component whose frequency is the natural frequency. In some embodiments, step (a) includes the step of generating at least two sets of skin temperature data, each indicative of skin temperature as a function of time at a different elevation within the fluidized bed. Some embodiments enable diagnosis of poor fluidization or mixing in the bed of a fluidized bed reactor, by analyzing Fourier-transformed, filtered skin temperature data. | 08-27-2009 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
Patent application number | Description | Published |
20090007599 | Method and Device For Producing Technical Glass Parts For Optical Applications - The present invention relates to a method for producing a technical glass part, particularly meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens, wherein a blank including a cast-on section is produced using an injection molding process, wherein the blank is cooled down and subsequently heated, and wherein the blank subsequently is blank molded, particularly on both sides, into a technical glass part meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens. | 01-08-2009 |
20130160852 | SOLAR CONCENTRATOR AND PRODUCTION METHOD - The invention relates to a solar concentrator, comprising a solid body made of a transparent material, which has a light coupling surface and a convex light decoupling surface, wherein the solid body has a light guide part between the light coupling surface and the convex light decoupling surface, wherein said light guide part is tapered in the direction of the convex light decoupling surface. The invention further relates to a production method, wherein the material is precision-molded between two molds. | 06-27-2013 |
20140042650 | PROCESS FOR MANUFACTURING A HEADLIGHT LENS FOR A MOTOR VEHICLE HEADLIGHT - A process for manufacturing a headlight lens for a vehicle headlight, wherein a blank is molded from transparent plastic material by means of an injection molding process, and wherein the blank is subsequently blank-molded by means of a final contour mold to form the headlight lens. | 02-13-2014 |
20150224725 | PROCESS FOR MANUFACTURING A HEADLIGHT LENS - The invention relates to a method for producing an optical lens element, in particular for illuminating purposes, in particular for producing a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight. A preform made of a transparent plastic, which is amorphous in particular, is molded in an injection mold using an injection molding method. The preform is removed from the injection mold, in particular before the average temperature of the preform falls below the melting temperature of the plastic and/or the flow temperature of the plastic, and the preform is subsequently pressed into the lens element, in particular the blank, using a final contour mold. | 08-13-2015 |