Class / Patent application number | Description | Number of patent applications / Date published |
570177000 | Purification or recovery | 35 |
20080255396 | PROCESS FOR THE REDUCTION OF ACIDIC CONTAMINATES IN FLUORINATED HYDROCARBONS - The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO | 10-16-2008 |
20090012336 | Selectively Reacting Olefins Having a Terminal CF2 Group in A Mixture - A process is disclosed for reducing the mole ratio of (1) compounds of the formula Y | 01-08-2009 |
20100145113 | SYSTEM AND METHOD FOR TREATING GROUNDWATER - A method and apparatus for removing fluorinated hydrocarbons and/or perchlorate species from groundwater which can utilize ion exchange media comprising a hydrophobic polymeric matrix. Fluorinated hydrocarbons can be reduced to a parts per trillion level and perchlorate to a low parts per billion level, rendering the groundwater suitable for consumption as drinking water under regulatory standards. | 06-10-2010 |
20130006023 | SYSTEM AND METHOD FOR TREATING GROUNDWATER - A method and apparatus for removing fluorinated hydrocarbons and/or perchlorate species from groundwater which can utilize ion exchange media comprising a hydrophobic polymeric matrix. Fluorinated hydrocarbons can be reduced to a parts per trillion level and perchlorate to a low parts per billion level, rendering the groundwater suitable for consumption as drinking water under regulatory standards. | 01-03-2013 |
20130158305 | METHOD FOR REMOVING MOISTURE FROM FLUORINE-CONTAINING COMPOUNDS - The present invention provides a method for removing moisture from fluorine-containing compounds, the method comprising bringing a fluorine-containing compound contaminated with moisture into contact with an aqueous solution containing a metal salt. The method of the present invention can continuously and efficiently remove moisture from various fluorine-containing compounds, such as hydrofluoroolefins. In addition, the method produces less waste, etc., and is an industrially advantageous moisture removal method. | 06-20-2013 |
20150018587 | PROCESSES FOR ISOLATING FLUORINATED PRODUCTS - Useful processes for isolating the fluorinated products formed by reaction with 4-tert-butyl-2,6-dimethylphenylsulfur trifluoride (Fluolead) are disclosed. The processes comprise the conversion of the byproduct (formula I) to sulfinate ester (formula V), and to sulfonate eater (formula VI), and then to the water-soluble sulfonate salt (formula IV) in the presence of the fluorinated products. | 01-15-2015 |
20160251285 | SYNTHESIS OF DIIODOPERFLUORO-C3 TO C7-ALKANES | 09-01-2016 |
570178000 | Including distillation | 15 |
20080287715 | POLYMERIZATION INHIBITOR FOR TETRAFLUOROETHYLENE - The present invention provides a polymerization inhibitor preventing the self-polymerization of TFE and the generation of a modified polymer of a polymerization inhibitor in a distillation step, particularly in a rectification step, of TFE. The present invention provides a method of distilling tetrafluoroethylene in the presence of a polymerization inhibitor comprising a cyclohexadiene compound of the formula: | 11-20-2008 |
20080293978 | PROCESS FOR THE SEPARATION OF FLUOROCARBONS USING IONIC LIQUIDS - This invention relates to a process for separating 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane wherein at least one ionic liquid is used to enhance the efficiency of the separation. | 11-27-2008 |
20090005618 | Azeotrope Compositions of Octafluorocyclobutane and Uses Thereof - The present disclosure related to azeotrope and near-azeotrope compositions comprising PFC-C318 and HFC-236cb. The present disclosure further relates to processes for removing PFC-C318 from HFC-236cb. And the present disclosure further relates to azeotrope and near azeotrope compositions comprising hydrogen fluoride and PFC-C318. | 01-01-2009 |
20110112341 | PROCESS FOR PRODUCING 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE - The present invention provides a process for producing 1,2,3,4-tetrachlorohexafluorobutane having a high purity at a low cost industrially and efficiently. The process for producing 1,2,3,4-tetrachlorohexafluorobutane according to the present invention comprises a step of allowing 1,2,3,4-tetrachlorobutane to react with a fluorine gas to prepare a reaction product containing 1,2,3,4-tetrachlorohexafluorobutane and hydrogen-containing compounds as an impurity, and a step of introducing the reaction product into single or plural distillation columns and distilling to separate the hydrogen-containing compounds from the reaction product and thereby preparing purified 1,2,3,4-tetrachlorohexafluorobutane wherein the at least one of distillation columns has a theoretical plate number of 15 or more. | 05-12-2011 |
20110144395 | PROCESS TO REMOVE HF FROM 1,1,1,2,2,3,4,5,5,5-DECAFLUOROPENTANE - Disclosed is process for the recovery of HFC-43-10mee from a mixture comprising hydrogen fluoride and HFC-43-10mee, comprising feeding the composition comprising hydrogen fluoride and HFC-43-10mee to a distillation column, subjecting said mixture to a distillation step from which is formed a column distillate composition comprising an azeotrope or azeotrope-like composition of hydrogen fluoride and HFC-43-10mee, and a column-bottoms composition comprising HFC-43-10mee, condensing said column distillate composition to form two liquid phases, being i) an HFC-43-10mee-rich phase and ii) an HF-rich phase; and separating said two liquid phases. | 06-16-2011 |
20110237847 | PROCESS FOR THE MANUFACTURE FLUOROCARBONS - Halocarbons of the structure CF | 09-29-2011 |
20110270001 | Method of Purifying (Z)-1-Chloro-3,3,3-Trifluoropropene - Disclosed is a method of purifying (Z)-1-chloro-3,3,3-trifluoropropene of the formula [1], comprising: distilling a mixture containing (Z)-1-chloro-3,3,3-trifluoropropene and 1-chloro-1,3,3,3-tetrafluoropropane (CF | 11-03-2011 |
20110295045 | Azeotrope-Like Composition of Hexafluoropropane, Hexafluoropropene and Hydrogen Fluoride - The present invention relates to an azeotropic or azeotrope-like mixture consisting essentially of 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and hydrogen fluoride. | 12-01-2011 |
20120010449 | SEPARATION OF R-1233 FROM HYDROGEN FLUORIDE - The invention relates to a process for separating monochloro-trifluoropropenes such as HCFC-1233 from azeotrope or azeotrope like combinations with HF. The process employs a cold, liquid phase separations and multiple azeotropic distillation trains. | 01-12-2012 |
20120323054 | PURIFICATION OF CIS-1,1,1,4,4,4-HEXAFLUORO-2-BUTENE VIA EXTRACTIVE DISTILLATION - A process for separating cis-1,1,1,4,4,4-hexafluoro-2-butene from a first mixture comprising cis-1,1,1,4,4,4-hexafluoro-2-butene and at least one chlorofluoroolefin is disclosed. The process involves the steps of contacting said first mixture with at least one extractive agent, to form a second mixture, distilling said second mixture; and recovering cis-1,1,1,4,4,4-hexafluoro-2-butene substantially free of chlorofluoroolefin. | 12-20-2012 |
20130131404 | AZEOTROPE-LIKE COMPOSITIONS OF (Z)-1-CHLORO-3,3,3-TRIFLUOROPROPENE AND HYDROGEN FLUORIDE - Disclosed are azeotropic and azeotrope-like mixtures of (Z)-1-chloro-3,3,3-trifluoropropene (1233zd(Z)) and hydrogen fluoride. Such compositions are useful as an intermediate in the production of 1233zd(Z). The latter compound is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent, aerosol propellant, heat transfer medium, dielectric, fire extinguishing composition and power cycle working fluid. | 05-23-2013 |
20130217929 | Azeotrope-Like Composition of Hexafluoropropane, Hexafluoropropene and Hydrogen Fluoride - The present invention relates to an azeotropic or azeotrope-like mixture consisting essentially of 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and hydrogen fluoride. | 08-22-2013 |
20140194656 | METHOD FOR PURIFYING CHLORINATED HYDROCARBON - The present invention provides a method for purifying chlorinated hydrocarbon(s), comprising cooling a mixture containing hydrogen fluoride and at least one chlorinated hydrocarbon selected from the group consisting of 2-chloro-3,3,3-trifluoropropene, 2,3-dichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1-difluoropropane, and 1,1,1,2,3-pentachloropropane to cause liquid-liquid separation of the mixture into an upper liquid phase having a high hydrogen fluoride concentration and a lower liquid phase having a high chlorinated hydrocarbon concentration, and a method for purifying a chlorinated hydrocarbon, comprising subjecting the lower liquid phase obtained by the liquid-liquid separation to a distillation operation. According to the present invention, a chlorinated hydrocarbon can be purified by separating and removing hydrogen fluoride from a chlorinated hydrocarbon-hydrogen fluoride mixture under simple and economically advantageous conditions. | 07-10-2014 |
20150291490 | METHOD FOR PURIFYING TETRAFLUOROPROPENE - To provide a method for efficiently separating 2,3,3,3-tetrafluoropropene (HFO-1234yf) and chloromethane (R40) from a composition containing HFO-1234yf and R40. | 10-15-2015 |
20160145177 | METHOD FOR PURIFYING 2-FLUOROBUTANE - The present invention is a method for 2-fluorobutane to obtain highly purified 2-fluorobutane through a process comprising a step for: bringing crude 2-fluorobutane that includes 5 to 50 wt % of butene into contact with a brominating agent that can form a bromonium ion in an aprotic polar solvent in the presence of water or an alcohol having up to 4 carbon atoms; converting the butene into compounds having a boiling point higher than that of 2-fluorobutane, then recovering 2-fluorbutane from the reaction solution; and purifying the recovered 2-fluorabutane by distillation. | 05-26-2016 |
570179000 | Solid sorbent utilized | 9 |
20110034740 | METHOD FOR PURIFYING TETRAFLUOROETHYLENE - To provide a method for purifying tetrafluoroethylene by removing, from tetrafluoroethylene containing a polymerization inhibitor, the polymerization inhibitor by adsorption. | 02-10-2011 |
20110105809 | PROCESS FOR THE PURIFICATION OF 2,3,3,3-TETRAFLUORO-1-PROPENE (HFO-1234YF) - The subject of the invention is a process for the purification of 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf). More particularly, it relates to a purification process in which 2,3,3,3-tetrafluoro-1-propene, comprising impurities based on halogen compounds, is brought into contact with an adsorbent, preferably molecular sieves and advantageously molecular sieves having a pore opening with an average diameter between 5 and 11 Å, preferably between 5 and 9 Å. | 05-05-2011 |
20120203037 | PROCESS FOR PURIFYING (HYDRO) FLUOROALKENES - The invention relates to a process for removing one or more undesired (hydro)halocarbon compounds from a (hydro)fluoroalkene, the process comprising contacting a composition comprising the (hydro)fluoroalkene and one or more undesired (hydro)halocarbon compounds with an aluminium-containing absorbent, activated carbon, or a mixture thereof. | 08-09-2012 |
20130085308 | METHODS TO SEPARATE HALOGENTATED OLEFINS FROM 2-CHLORO-1,1,1,2-TETRAFLUOROPROPANE USING A SOLID ADSORBENT - The present invention provides a method for separating halocarbons. In particular, the invention provides a method for separating halogenated olefin impurities from 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) using a solid adsorbent, particularly activated carbon. More particularly the invention pertains to a method for separating 2-chloro-3,3,3-trifluoro-propene (HCFO-1233xf) from HCFC-244bb, which are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf). | 04-04-2013 |
20140051896 | Method for Purifying Trans-1,3,3,3-Tetrafluoropropene - Disclosed is a method for purifying a trans-1,3,3,3-tetrafluoropropene, in which a composition containing trans-1,3,3,3-tetrafluoropropene and at least one impurity selected from the group consisting of C | 02-20-2014 |
20140275655 | METHODS FOR REMOVING HALOGENATED ETHYLENE IMPURITIES IN 2,3,3,3-TETRAFLUOROPROPENE PRODUCT - The present process relates to a process comprising: contacting a mixture comprising 2,3,3,3-tetrafluoropropene and at least one halogenated ethylene impurity with at least one adsorbent or at least one chemisorption catalyst to reduce the concentration of said at least one halogenated ethylene impurity. | 09-18-2014 |
20140303413 | METHODS TO SEPARATE HALOGENTATED OLEFINS FROM 2-CHLORO-1,1,1,2-TETRAFLUOROPROPANE USING A SOLID ADSORBENT - The present invention provides a method for separating halocarbons. In particular, the invention provides a method for separating halogenated olefin impurities from 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) using a solid adsorbent, particularly activated carbon. More particularly the invention pertains to a method for separating 2-chloro-3,3,3-trifluoro-propene (HCFO-1233xf) from HCFC-244bb, which are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf). | 10-09-2014 |
20150087869 | CAPTURE OF TRIFLUOROMETHANE USING MOLECUAR SIEVES - A method for capturing trifluoromethane from a gaseous mixture in a vent stream from a chlorodifluoromethane manufacturing process is described. In the method, the gaseous mixture is contacted with a molecular sieve, such as a zeolite or activated carbon, having a pore opening of at least about 5 Angstroms and a Sanderson electronegativity of less than or equal to about 2.75. The method is useful for reducing emissions of trifluoromethane, which has a high global warming potential. | 03-26-2015 |
20160115105 | Process for Purifying (Hydro)Fluoroalkenes - The invention relates to a process for removing one or more undesired (hydro)halocarbon compounds from a (hydro)fluoroalkene, the process comprising contacting a composition comprising the (hydro)fluoroalkene and one or more undesired (hydro)halocarbon compounds with an aluminium-containing absorbent, activated carbon, or a mixture thereof. | 04-28-2016 |
570180000 | Including extraction with organic liquid | 4 |
20090131728 | PROCESS FOR THE SEPARATION OF DIASTEREOMERS - A process for separating the diastereomers of a compound such as dihydrodecafluoropentane by using an ionic liquid to increase separation efficiency. The process may involve separation of the threo and erythro diastereomers of HFC-4310mee by liquid-liquid extraction wherein at least one ionic liquid is used as the extractant. | 05-21-2009 |
20120046505 | PROCESSES FOR REDUCING THE AMOUNT OF MONOFLUOROACETATE IN HYDROFLUOROOLEFIN PRODUCTION - A process is disclosed for reducing the amount of monofluoroacetate. The process involves (a) contacting a hydrofluorocarbon with a reactant basic aqueous solution to produce an organic phase solution containing a hydrofluoroolefin and an aqueous phase solution containing a monofluoroacetate; and (b) heating the aqueous phase solution to an effective temperature to reduce the amount of monofluoroacetate in the aqueous phase solution, wherein fluoride concentration in the aqueous phase solution is substantially high. Another process is disclosed for reducing the amount of monofluoroacetate. The process involves (a) contacting a first batch of hydrofluorocarbon with a first batch of reactant basic aqueous solution to produce a first batch of organic phase solution containing a hydrofluoroolefin and a first batch of aqueous phase solution containing a monofluoroacetate; (b) separating the first batch of organic phase solution from the first batch of aqueous phase solution; (c) mixing a second batch of hydrofluorocarbon and a second batch of reactant basic aqueous solution with the separated first batch of organic phase solution to produce a second batch of organic phase solution containing a hydrofluoroolefin and a second batch of aqueous phase solution containing a monofluoroacetate; (d) combining the first batch of aqueous phase solution with the second batch of aqueous phase solution; and (e) heating the combined aqueous phase solutions to an effective temperature to reduce the amount of monofluoroacetate in the combined aqueous phase solutions, wherein fluoride concentration in the combined aqueous phase solutions is substantially high. | 02-23-2012 |
20120165579 | PROCESS FOR THE SEPARATION OF FLUOROCARBONS USING IONIC LIQUIDS - This invention relates to a process for separating 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane wherein at least one ionic liquid is used to enhance the efficiency of the separation. | 06-28-2012 |
20120215040 | FLUORINE-CONTAINING COMPOUND PURIFICATION METHOD - There is provided a fluorine-containing compound purification method for obtaining a high-purity fluorine-containing compound by efficiently separating and removing hydrogen chloride from a fluorine-containing compound that contains hydrogen chloride, i.e., from a crude fluorine-containing compound. The fluorine-containing compound purification method of the present invention comprises the following steps (1) and (2) in this order:
| 08-23-2012 |