Class 570/151 - Isomerization

Subclass of Class 570 - Organic compounds -- part of the class 532-570 series
Definition: Process wherein a fluorine containing compound is converted
No. of patents: 36
Last issue date: 09/02/2008

Number	Title	Issue Date
7420094	Catalytic isomerization processes of 1,3,3,3-tetrafluoropropene for making 2,3,3,3-tetrafluoropropene The present invention relates to a process of catalyzed isomerization of HFC-1234ze to make HFC-1234yf. The process comprises contacting HFC-1234ze with a suitable catalyst in a reactor to obtain a product mixture comprising HFC-1234yf. ...	09/02/2008
7332635	Processes for purifying 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...	02/19/2008
7329786	Processes for producing CFCFHCF 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...	02/12/2008
6791001	Process to obtain CFC 113a from CFC 113 A process in gaseous phase to obtain CFC 113a starting from CFC 113, wherein CFC 113, optionally diluted with a gas inert under the reaction conditions, is let flow on a catalyst formed by aluminum fluoride. ...	09/14/2004
6781021	Method for isomerizing halogenated aromatics A catalyst composition with a high halogenated aromatics isomerization activity, a halogenated aromatic isomerization method using said catalyst composition, and a halogenated aromatics isomerization method capable of prolonging the life or regeneration period of th...	08/24/2004
6774270	Method of removing hexafluoropropylene dimers A method of removing hexafluoropropylene dimers (“HFP dimers”), dimer hydrides and other oligomers from a fluid is described. The method comprises heating the fluid to isomerize the HFP dimers to the thermodynamic isomer, and contacting the fluid with a tertiary...	08/10/2004
6323379	Process for obtaining pentafluoroethane by tetrafluorochloroethane dismutation A process for obtaining pentafluoroethane HFC 125 by dismutation of gaseous tetrafluorochloroethane HCFC 124, at temperatures in the range 200°-300° C., on a trivalent chromium oxide (Cr2 O3) catalyst, supported on aluminum fluorid...	11/27/2001
6262320	Addition of trifluoromethanes to fluoroolefins and isomerization of monohaloperfluoro alkanes A process for the Lewis acid catalyzed addition of trifluoromethanes across the carbon-carbon double bond of fluoroolefins is disclosed. A process for isomerization of monohaloperfluoro alkanes is also disclosed....	07/17/2001
6232513	Isomerization of hydrofluorocarbon In order to isomerize a hydrofluorocarbon having a certain thermodynamic stability (HFC 1) into a hydrofluorocarbon of greater thermodynamic stability (HFC 2), the hydrofluorocarbon HFC 1 is subjected to a heat treatment in the presence of hydrogen at a t...	05/15/2001
5847242	Catalysts for halogenated hydrocarbon processing, their precursors and their preparation and use A process is disclosed for changing the fluorine content of halogenated hydrocarbons containing from 1 to 6 carbon atoms, in the presence of a multiphase catalyst, which is characterized by preparing certain single phase solid catalyst precursors containi...	12/08/1998
5831136	Process for manufacture of high purity 1,1-dichlorotetrafluoroethane This invention relates to processes for the manufacturing of 1,1-dichlorotetrafluoroethane (i.e., CF3 CCl2 F or CFC-114a), and more particularly to processes for manufacturing CF3 CCl2 F substantially free of it...	11/03/1998
5824828	Process for manufacture of trichlorotrifluoroethanes This invention relates to a process for the manufacture of C2 Cl3 F3 reaction product from a mixture of C2 Cl4 F2 isomers, and more particularly to the manufacture of C2 Cl3	10/20/1998
5744660	Products of tetrafluorothanes This invention relates to a process for the production of 1,1,2,2- and/or 1,1,1,2-tetrafluoroethanes, and in particular to a process for the production of 1,1,1,2-tetrafluoroethane....	04/28/1998
5672785	Process for producing 1,1-dichloro-12,2,2-tetrafluoroethane A process for producing 1,1-dichloro-1,2,2,2-tetrafluoroethane, which comprises isomerizing 1,1,2-trichloro-1,2,2-trifluoroethane to form 1,1,1-trichloro-2,2,2-trifluoroethane, followed by fluorination with hydrofluoric acid....	09/30/1997
5545770	Process for manufacture of high purity 1, 1-dichlorotetrafluoroethane A process is disclosed for producing a product comprising CCl2 FCF3 substantially free of CClF2 CClF2. The process includes (i) contacting a mixture of perhalogenated hydrocarbons which is essentially free of CC...	08/13/1996
5446216	Process for manufacture of high purity 1,1-dichlorotetrafluoroethane A process is disclosed for producing a product comprising CCl2 FCF3 substantially free of CClF2 CClF2. The process includes (i) contacting a mixture of perhalogenated hydrocarbons which is essentially free of CC...	08/29/1995
5430201	Chlorofluoro (hydro) carbon conversion process A process for preparing R113a from R113, and R123 from R123a or R123b by rearrangement over AlCl3, in which when the reaction mixture is heated sudden start-up of the reaction, which often causes large amounts of heat to be released and the rea...	07/04/1995
5416246	Chlorofluorocarbon isomerization A process is disclosed for producing a saturated gem-dichloro chlorofluorocarbon product of the formula Cn Cla Fb, wherein n is 2 to 12, a is 2 to 4, and b is 4 to 24, and wherein a+b equals 2n+2 when the chlorofluorocarbo...	05/16/1995
5414167	Process for purifying 1,1,1-trifluoro-2,2-dichloroethane from isomer 1,1,2-trifluoro-1,2-dichloroethane The 1,1,2-trifluoro-1,2-dichloroethane content is reduced or removed from 1,1,1-trifluoro-2,2-dichloroethane by contacting a gaseous mixture comprising said compounds with chrome oxide (Cr2 O3) either as such or supported, at tempera...	05/09/1995
5406009	Catalytic equilibration to improve the relative yield of selected halocarbons Gas phase and liquid phase processes are disclosed which use interconversion of CF3 CHFCl and CF2 HCF2 Cl in contact with catalyst consisting essentially of halided aluminum oxide and/or aluminum halide at elevated tempera...	04/11/1995
5315048	Preparation of 1,1,1,2,3-pentafluoropropane by reduction of 1,2,3-trichloropentafluropropane The present invention relates to a process for the reductive dechlorination of ClCF2 CFClCF2 Cl to CF3 CHFCH2 F comprising the step of contacting 1,2,3-trichloropentafluoropropane and H2 in the presen...	05/24/1994
5302766	Isomerization process A process for converting the isomers of HCFC-123 to HCFC-123 using TaF5 and/or Nb5 in the absence of HF....	04/12/1994
5157171	Process for chlorofluoropropanes A process for the preparation of chlorofluoropropanes of the formula C3 HCl2 F5 by contacting monofluorodichloromethane with tetrafluoroethylene in the presence of a modified aluminum chloride catalyst at a temperature of ...	10/20/1992
5091600	Tetrafluoroethane isomerization A method for the preparation of 1,1,1,2-tetrafluoroethane whereby 1,1,2,2-tetrafluoroethane is contacted with the fluorination catalyst at elevated temperature to effect isomerization....	02/25/1992
5030372	Catalytic equilibration to improve the relative yield of selected halocarbons Gas phase and liquid phase processes are disclosed which use interconversion of CF3 CHFCl and CF2 HCF2 Cl in contact with catalyst consisting essentially of halided aluminum oxide and/or aluminum halide at elevated tempera...	07/09/1991
5017732	Process for preparing chlorofluorocarbons via an in situ generated activated aluminum trihalide catalyst and products resulting therefrom A process for isomerizing a chlorofluorocarbon of the formula: CClFYCClFX wherein X and Y are independently selected from chlorine and fluorine provided that X is not --Cl when Y is --F to the compound of the formula: CCl2 YCF2 X The process c...	05/21/1991
4996379	Method of preparing 1,1,1,2-tetrafluoroethane from 1,1-dichloro-1,2,2,2-tetrafluoroethane 1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-d...	02/26/1991
4950815	Tetrafluoroethane isomerization A method for the preparation of 1,1,1,2-tetrafluoroethane whereby 1,1,2,2-tetrafluoroethane is contacted with the fluorination catalyst at elevated temperature to effect isomerization....	08/21/1990
4925993	Process for preparing chlorofluorocarbons via an in situ generated activated aluminum trichloride catalyst and products resulting therefrom A process of isomerizing a chlorofluorocarbon of the formula: ##STR1## wherein X is chlorine or fluorine to the compound of the formula: ##STR2## The process comprises contacting the chlorofluorocarbon with an activated aluminum trichloride cata...	05/15/1990
4902838	Isomerization of saturated fluorohydrocarbons A process for isomerizing saturated C2 to C6 fluorohydrocarbons having lesser thermodynamic stability to fluorohydrocarbons having greater thermodynamic stability comprising contacting in the gaseous phase at a temperature from about...	02/20/1990
4748284	Process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes A process for preparing 1,1-dihalo-1,2,2,2-tetrafluoroethanes by isomerization of 1,2-dihalotetrafluoroethanes at their reflux temperature, by using, as a catalyst, the reaction product prepared "in situ" from an anhydrous aluminum halide with at least eq...	05/31/1988
4734503	Catalytic transhalogenation of haloaromatics Catalytic transhalogenation of haloaromatics according to the equation: wherein: when Cz is a benzene derivative, a+b=5; e=0; c+d=5; z=6; when Cz is a pyridine derivative, a+b=4; e=1; c+d=4; z=5; when Cz is a naphthalene derivative, a+b=...	03/29/1988
4608358	Catalyst for the isomerization reaction of quadricyclanes to norbornadienes The present invention relates to a catalyst for the isomerization reaction from quadricyclanes to norbornadienes in a conversion system from light energy to heat energy which comprises cyclopropenylidene palladium complex represented by the formula, ...	08/26/1986
4479022	Isomerization of bromohalogenobenzenes Bromohalogenobenzenes are isomerized to useful, e.g., pharmaceutical or phytosanitary intermediates, by contacting the same with an alkaline base and a catalyst compound which forms a complex with the cation of said alkaline base....	10/23/1984
4436941	Process for the isomerization of alkylbenzotrifluorides Alkylbenzotrifluorides can be isomerized in the presence of hydrogen fluoride....	03/13/1984
4093670	Process of isomerizing oligomers of hexafluoropropene Easy-to-prepare dimers of hexafluoropropene such as ##STR1## are heated at 20°-150° C in a nonprotonic polar solvent such as acetonitrile in the presence of an alkali metal fluoride and a crown ether to isomerize the dimers into thermodynamically s...	06/06/1978

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Class 570/151 - Isomerization