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| Number | Title | Issue Date |
| 7964760 | 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 th... | 06/21/2011 |
| 7405334 | 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, HNO3 and H2SO4 in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phos... | 07/29/2008 |
| 7371363 | Methods of purifying hydrogen fluoride Provided are methods of producing anhydrous hydrogen fluoride comprising: providing a mixture comprising hydrogen fluoride and at least one halogenated hydrocarbon; and extracting hydrogen fluoride from the mixture by contacting the mixture with a solution of less t... | 05/13/2008 |
| 7361795 | Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the production... | 04/22/2008 |
| 7335805 | Processes for purifying reaction products and processes for separating chlorofluorinated compounds Methods and materials are provided for the production of essentially isomerically pure perhalogenated and partially halogenated compounds. One embodiment of the present invention provides a process for the production of essentially isomerically pure CFC-216aa. Other... | 02/26/2008 |
| 7189311 | Purification of difluoromethane A method for separating difluoromethane from a mixture of difluoromethane and at least one impurity, the method involving extractively distilling the mixture using dichloromethane as an extractive agent to recover a product stream of purified difluoromethane having ... | 03/13/2007 |
| 7157550 | Purification process of thermoprocessable tetrafluoroethylene copolymers A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps: A) the polymer latex is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte having pH values≦2; ... | 01/02/2007 |
| 7151197 | Processes for purifying chlorofluorinated compounds and processes for purifying CF3CFHCF3 Methods and materials are provided for the production of essentially isomerically pure perhalogenated and partially halogenated compounds. One embodiment of the present invention provides a process for the production of essentially isomerically pure CFC-216aa. Other... | 12/19/2006 |
| 7074434 | Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane... | 07/11/2006 |
| 7015368 | Purification process of thermoprocessable tetrafluoroethylene copolymers A purification process of thermoprocessable tetrafluoroethylene (TFE) copolymers comprising the following steps: A) the polymer latex is transformed into gel form, under mechanical stirring, by addition of an acid electrolyte havin... | 03/21/2006 |
| 6710216 | Method and apparatus for recovering a solvent In a closed-loop biomass extraction apparatus (10), strategies for purifying HFC solvents used therein include: (i) contacting an adsorbent and a desiccant, e.g. in a container (26) with contaminated HFC solvent branched from the main flow loop;... | 03/23/2004 |
| 6673264 | Azeotrope-like compositions of 1,1,1,3,3-pentafluorobutane and hydrogen fluoride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluorobutane (HFC-365) and hydrogen fluoride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the... | 01/06/2004 |
| 6642415 | Method for recovering fluorinated emulsifiers Fluorinated emulsifiers, in particular, perfluorooctanoic acid are bound to anionic exchange resins for the purification of aqueous effluent from the production of fluoropolymers. Said emulsifiers may be quantitatively eluted from the exchanger with a wat... | 11/04/2003 |
| 6555086 | Hydrogen fluoride recovery process Processes for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride are disclosed. The processes include contacting the gaseous mixture with a solution of an alkali metal fluoride in hydrogen fluor... | 04/29/2003 |
| 6500994 | Purification of 1,1,1,3,3-pentafluorobutane A process for purification of 1,1,1,3,3-pentafluorobutane (HFC-365mfc) containing a decreased amount of hydrogen chloride, hydrogen fluoride and/or unsaturated impurities. To this end crude 1,1,1,3,3-pentafluorobutane is treated in the liquid phase with a... | 12/31/2002 |
| 6437168 | Method for production of aromatic fluorine compound A method for efficiently extracting a reaction product containing a target aromatic fluorine compound formed by the halogen exchange reaction of an aromatic chlorine compound with a fluorinating agent quickly from the reaction vessel without suffering par... | 08/20/2002 |
| 6403849 | Method for purifying perfluorocarbons A method for obtaining purified perfluorocarbon compositions, and purified compositions containing such perfluorocarbons.... | 06/11/2002 |
| 6399841 | Method for separating hydrogen fluoride from its mixtures with 1,1,1,3,3-pentafluorobutane and method for making 1,1,1,3,3-pentafluorobutane Hydrogen fluoride is separated from its mixtures with 1,1,1,3,3-pentafluorobutane by extraction using an organic solvent containing a 1,1,1,3,3-chloro(fluoro)butane.... | 06/04/2002 |
| 6328907 | Azeotrope comprising pentafluoropropane and hydrogen fluoride and method for separating and purifying pentafluoropropane There is provided an azeotropic mixture consisting substantially of 1,1,1, 3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture comprising R-245fa and HF wherein the mi... | 12/11/2001 |
| 6307115 | Method for purifying pentafluoroethane The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115) by liquid/liquid extraction or by extractive distillation. Perchloroethylene is used as extraction agent.... | 10/23/2001 |
| 6303838 | Separating 1,1,1,3,3-pentafluoropropane from hydrogen fluoride Disclosed are processes for separating 1,1,1,3,3-pentafluoropropane (HFC-245fa) from hydrogen fluoride (HF) by distillation, wherein hydrocarbons, chloroflurocarbons, hydrochlorofluorocarbons and fluorocarbons are used as entraining agents. The processes ... | 10/16/2001 |
| 6297412 | Process for purifying difluoromethane A process for purifying difluoromethane, which comprises subjecting a mixture comprising difluoromethane and hydrogen fluoride to extraction treatment with at least one extractant selected from the following (a) and (b) to separate it by liquid separation... | 10/02/2001 |
| 6294055 | Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 carbon atoms, by extraction using an organic solvent.... | 09/25/2001 |
| 6191328 | Method for 1, 1, 1, 3, 3-pentafluoropropane HFC-245fa is effectively separated from the mixture comprising 1,1,1,3,3-pentafluoropropane (HFC-245fa) and HF through a purification process comprising contacting at least one extraction agent selected from the group consisting of (a) a compound correspo... | 02/20/2001 |
| 6175045 | Process for the preparation of pentafluoroethane There is provided a process of effectively separating pentafluoroethane (HFC-125) from a mixture of HFC-125 and chloropentafluoroethane (CFC-115). When the mixture of HFC-125 and CFC-115 is subjected to an extractive distillation to obtain a concentrated HFC-1... | 01/16/2001 |
| 6156944 | Extraction of hydrogen fluoride from a halocarbon/hydrogen fluoride azeotropic mixture A process for the separation of mixtures containing halocarbons and hydrogen fluoride. Either water alone or a blend comprising water and hydrogen fluoride is added to a mixture comprising a halocarbon and hydrogen fluoride to thereby form a first phase r... | 12/05/2000 |
| 6013846 | Azeotrope of HF and 1233zd An azeotrope containing HF and 1233zd is provided, as are methods for separating this azeotrope from mixtures of HF and 1233zd which are HF-rich or 1233zd-rich and methods for making use of the azeotrope and separation methods to improve processes for pre... | 01/11/2000 |
| 5973215 | Process for separating and recovering hydrogen fluoride from mixtures A process is disclosed for the liquid phase separation and recovery of hydrogen fluoride from a mixture comprising hydrogen fluoride and a fluorinated organic hydrocarbon. The process requires that the mixture be treated with a sufficient amount of a coup... | 10/26/1999 |
| 5874658 | Purification of organic fluorine compounds A method is disclosed for separating a mixture of at least one hydrofluorocarbon from hydrogen fluoride. The method comprising treating said mixture with a compound selected from the group consisting of an alkanolamine of formula NHa (CHb | 02/23/1999 |
| 5874657 | Process for the purification of 1,1-difluoroethane The present invention relates to processes for separating 1,1-difluoroethane (HFC-152a) from vinyl chloride by using extractive distillation with an extractive agent selected from the aliphatic hydrocarbons, chlorocarbons and alcohols.... | 02/23/1999 |
| 5852223 | Purification methods of pentafluoroethane The purification of pentafluoroethane (HFC-125) which is composed of a process A, in which an unpurified mixture (1), containing at least chloropentafluoroethane (CFC-115) and pentafluoroethane (HFC-125) is reacted with hydrogen (4) in the presence of a c... | 12/22/1998 |
| 5744662 | Separation of R-12 and R-134a by a liquid-liquid extraction technique A process for separating and purifying dichlorodifluoromethane and 1,1,1,2 tetrafluoroethane from a feed of their mixtures by liquid-liquid extraction with extracting solvent containing paraffinic or naphthalenic mineral oils or a mixture thereof, with or... | 04/28/1998 |
| 5744669 | Process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates A process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates to produce a stream comprising hydrogenated hydrocarbonaceous compounds free from organic nitrates and halogenated organic compounds by means of c... | 04/28/1998 |
| 5696309 | Purification of halogenated carbon compounds Disclosed is a method of chlorinating vinylidene chloride contained in a solution 1,1 -dichloro-1-fluoroethane to provide a chlorinated compound having a boiling point different from the 1,1-dichloro-1-fluoroethane to permit separation therefrom. The meth... | 12/09/1997 |
| 5684219 | Process for preparing fluorinated aliphatic compounds A process is disclosed for the preparation of a fluorinated aliphatic olefin having the formula CHa F3-a --CH2 --CHb F3-b wherein a is 0 or the integer 1 or d and b is 0 or the integer 1, 2 or 3. In the first s... | 11/04/1997 |
| 5600041 | Process for the selective removal of organic nitrates from a halogenated organic stream containing trace quantities of organic nitrates A process for treating a stream containing halogenated organic compounds and having trace quantities of organic nitrates to produce a stream comprising halogenated organic compounds free from organic nitrates by the utilization of a hydrogenation zone ope... | 02/04/1997 |
| 5560899 | Process for separating HF from its mixtures with hydrochlorofluorocarbons 123 and/or 124 The invention relates to a process for separating HF contained in liquid mixtures comprising HCFC 123 and/or 124. The mixtures, enriched in C2 Cl4 up to a content of such compound of 20-75% by weight, is subjected to a treatment for ... | 10/01/1996 |
| 5426254 | Process for the separation of hydrogen fluoride from its mixtures with 1,1,1-trifluoro-2-chloroethane The invention relates to the separation of hydrogen fluoride (HF) from its mixtures with 1,1,1-trifluoro-2-chloroethane (F133a). By settling of the mixture of HF and F133a in the presence of trichloroethylene at a temperature below 0° C., a lower organic ... | 06/20/1995 |
| 5326918 | Purification of 1,1-dichloro-1-fluoroethane This invention relates to a process to remove the unsaturated impurities (in particular vinylidene chloride) present in a crude 1,1-dichloro-1-fluoroethane. This process comprises subjecting the product to be purified, in the liquid phase, in the presence... | 07/05/1994 |
| 5175380 | Process for removing impurities from perfluorinated alkyl bromides or alkylene dibromides Mixtures of perfluorinated alkyl bromides or alkylene dibromides containing perfluorinated iodine compounds are irradiated with electromagnetic radiation in the wavelength range from 230 to 500 nm and brought into contact, either during the irradiation or... | 12/29/1992 |
