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| Number | Title | Issue Date |
| 5354928 | Process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane The invention relates to a process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane. The process which consists of gas phase catalytic fluorination of at least one pentahaloethane of formula C2 HX2-n F3... | 10/11/1994 |
| 5345016 | Manufacture of 1,1,1,2-tetrafluoroethane This invention provides an improved process for the manufacture of 1,1,1,2-tetrafluoroethane by the reaction of HF and trichloroethylene in the presence of a catalyst to form a mixture comprising 2-chloro-1,1,1-trifluoroethane and 1,1,1,2-tetrafluoroethan... | 09/06/1994 |
| 5336817 | Method of preparing 1,1,1,2-tetrafluoroethane A method of preparing CH2 FCF3 from fluorodichloro-ethylene using a catalytically active niobium, tantalum or molybdenum fluorosulfonate compound or a catalyst mixture which comprises a niobium, tantalum or molybdenum halide and a su... | 08/09/1994 |
| 5334785 | Process for the manufacture of 1,1,1,2-tetrafluoroethane An improved process for the vapor phase fluorination, especially fluorination of 1,1,1-trifluoro-2-chloroethane (CFC-133a) with HF to produce 1,1,1,2-tetrafluoroethane (HFC-134a) employs a catalyst which preferably consists essentially of boehmite and Cr(... | 08/02/1994 |
| 5334786 | Process for preparing 1,1,1,2-tetrafluoroethane In a process for preparing 1,1,1-trifluorochloroethane by reacting, in a gas phase, trichloroethylene and hydrogen fluoride, when the reactant gases are diluted with a gas which is inactive to the reaction, it is very easy to control a reaction temperatur... | 08/02/1994 |
| 5334784 | Water separation process Water present in a hot gaseous product stream from a reactor system A,B (FIG. 1 ) containing hydrogen fluoride is separated from the stream in order to eliminate a potentially corrosive combination of water and HF. The water is removed by contacting the g... | 08/02/1994 |
| 5306849 | Process for the preparation of halogenated aromatics Halogenated aromatics are prepared by heating halogenoformic acid esters to 80° to 280° C. in the presence of hydrogen fluoride or a catalytic amount of one or more Lewis acids from the group comprising aluminium halides, iron halides and antimony halid... | 04/26/1994 |
| 5283381 | Process for preparing fluorine-containing ethane derivatives A process for preparing fluorine-containing ethane derivatives using hydrogen fluoride and a catalytically active formulation comprising a tantalum fluorosulfonate compound or a niobium fluorosulfonate compound is described. The process is particularly su... | 02/01/1994 |
| 5268343 | Process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227) The invention relates to a process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the catalyst is heated to from 450° to 900° C. in a stream of inert gas or under ... | 12/07/1993 |
| 5243105 | Chemical process 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride under superatmospheric pressure in a first reaction zone to form 1,1,1-trifluoro-2-chloroethane... | 09/07/1993 |
| 5243107 | Chemical process 1,1,1,2-tetrafluoroethane (HFA 134a) is manufactured from trichloroethylene by a two-stage process comprising reacting trichloroethylene with hydrogen fluoride in one reactor to form 1,1,1-trifluoro-2-chloroethane (133a) and reacting the 1,1,1-trifluoro-2... | 09/07/1993 |
| 5233105 | Process for halogen-fluorine exchange in organic compounds and catalysts for this process Bismuth/alkaline earth metal catalysts which contain 0.005-0.8 g-atom of bismuth per mol of the alkaline earth metal compound employed and can furthermore contain promoters and/or inert additives, and lanthanide catalysts with or without catalyst supports... | 08/03/1993 |
| 5227546 | Process for preparing fluorine-containing ethane derivatives A process for preparing fluorine-containing ethane derivatives using hydrogen fluoride and a catalytically active formulation comprising a tantalum fluorosulfonate compound or a niobium fluorosulfonate compound is described. The process is particularly su... | 07/13/1993 |
| 5220083 | Synthesis of perfluoropropane The present invention relates to syntheses of perfluoropropane-- .e., octafluoropropane--from acyclic three-carbon hydrocarbons or partially or totally halogenated acyclic three-carbon hydrocarbons.... | 06/15/1993 |
| 5214223 | Method of preparing fluorine-containing ethane derivatives A method of preparing fluorine-containing ethane derivatives using a catalyst mixture which comprises a metal halide and a sulfonic acid derivative is described. The method is particularly well suited for preparing CF3 CHCl2 (R123) f... | 05/25/1993 |
| 5185482 | Manufacture of 1,1,1,2-tetrafluoroethane This invention provides an improved process for the manufacture of 1,1,1,2-tetrafluoroethane by the reaction of HF and trichloroethylene in the presence of a catalyst to form a mixture comprising 2-chloro-1,1,1-trifluoroethane and 1,1,1,2-tetrafluoroethan... | 02/09/1993 |
| 5171901 | Process for the preparation of 1,1,1,3,3,3-hexafluoropropane and 2-chloro-1,1,1,3,3,3-hexafluoropropane Hexafluoropropanes of the formula CF3 -CHX-CF3 where X is hydrogen or chlorine are prepared by reacting hexachloropropene with hydrogen fluoride in the gas phase in the presence of a catalyst.... | 12/15/1992 |
| 5159126 | Process for the manufacture of 1-chloro-1,1-difluoroethane 1-Chloro-1,1-difluoroethane is prepared by reacting hydrogen fluoride with vinylidene chloride, in a liquid medium containing preferably at least 40 mol % 1,1-dichloro-1-fluoroethane.... | 10/27/1992 |
| 5068472 | Multistep synthesis of hexafluoropropylene The present invention relates to multistep syntheses of hexafluoropropylene from hexachloropropylene. In all these syntheses the first step is a fluorination of the starting material; later steps convert the initial products to CF3 --CFCl--CF | 11/26/1991 |
| 5057634 | Multistep synthesis of hexafluoropropylene The present invention relates to multistep syntheses of hexafluoropropylene from acyclic three-carbon hydrocarbons or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the... | 10/15/1991 |
| 5043491 | Multistep synthesis of hexafluoropropylene The present invention relates to multistep syntheses of hexafluoropropylene from propane, propylene or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting mater... | 08/27/1991 |
| 5008474 | Process for the manufacture of 1-chloro-1,1-difluoroethane 1-Chloro-1,1-difluoroethane is prepared by reacting hydrogen fluoride with vinylidene chloride, in a liquid medium containing preferably at least 40 mol % 1,1-dichloro-1-fluoroethane.... | 04/16/1991 |
| 4962244 | Process for producing 1,1-dichloro-1-fluoroethane and/or 1-chloro-1,1-difluoroethane free of vinylidene chloride 1,1-Dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane are prepared from the liquid phase fluorination of 1,1,1-trichloroethane by HF in the presence of a homogenous catalyst. 1,1-Dichloro-1-fluoroethane or 1-chloro-1,1-difluoroethane are selectively... | 10/09/1990 |
| 4912270 | Chromia aerogel, method of producing same and fluorination process utilizing same Chromium(III) oxide and hydroxide aerogels are produced by the reaction of chromium(VI) oxide with a solvent which is reducing to chromium(VI), such as methanol, heating the solution to hypercritical conditions, and venting the solvent hypercritically. Th... | 03/27/1990 |
| 4876406 | Process for gaseous phase fluorination of aliphatic chlorinated or chlorofluorinated hydrocarbons This invention relates to improved catalysts for gaseous phase fluoridation of aliphatic chlorinated and chlorofluorinated hydrocarbons by hydrofluoric acid. The catalysts comprise chromium salts or oxides complexed with aluminum phosphate and are charact... | 10/24/1989 |
| 4849555 | Synthesis of 1-chloro-1, 1-difluoroethane The invention relates to a process for the manufacture of 1-chloro-1,1-difluoroethane in the liquid phase by reacting hydrofluoric acid with 1,1,1-trichloroethane and/or 1,1-dichloro-1-fluoroethane. The selectively is improved by using a perfluoroalkanesulphon... | 07/18/1989 |
| 4766258 | Process for producing hydrocarbon fluoride A process for producing a hydrocarbon fluoride at a high selectivity with minimum formation of by-products is disclosed, which comprises reacting a hydrogen-containing hydrocarbon halide with anhydrous hydrogen fluoride in a liquid phase in the presence o... | 08/23/1988 |
| 4680406 | Process for fluorinating halogenated organo-compounds A novel apparatus and a process for fluorinating organic compounds from halogen-containing organic compounds is disclosed.... | 07/14/1987 |
| 4668830 | Process for the preparation of compounds containing a difluoromethylene or trifluoromethyl group A process for the preparation of compounds containing a difluoromethylene or trifluoromethyl group. A compound containing a carbonyl group, preferbly an acid, acid halide, amide, ketone or any compound containing a perhaloalkylcarbonyl moiety is placed, i... | 05/26/1987 |
| 4605798 | Continuous process for the gaseous-phase preparation of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochloropentafluoroethane in controlled proportions This invention relates to a continuous gaseous-phase process for the preparation of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochloropentafluoroethane, in predetermined proportions, from tetrachloroethylene, chlorine and hydrofluoric acid... | 08/12/1986 |
| 4474895 | Catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated hydrocarbons This invention relates to improved catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated hydrocarbons by hydrofluoric acid. The catalysts are characterized by an active carbon support having a total specific surface area ... | 10/02/1984 |
| 4439534 | Catalyst of chromium oxide microspheres and process for its preparation This invention relates to catalysts for gaseous phase fluorination of aliphatic chlorinated derivatives by hydrofluoric acid. The catalysts comprise chromium oxide microspheres obtained by a sol-gel process. This invention also relates to gaseous phase fl... | 03/27/1984 |
| 4418004 | Catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated derivatives This invention relates to improved catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated derivatives by hydrofluoric acid. The catalysts are characterized by an active carbon support having a total specific surface area g... | 11/29/1983 |
| 4383128 | Production of monofluorotrichloroethane 1-Fluoro-1,1,2-trichloroethane is produced by a process which comprises the reaction of trichloroethylene with hydrogen fluoride using about 1.5 to 3.5 moles of hydrogen fluoride per mole of trichloroethylene, and conducting the reaction in the presence o... | 05/10/1983 |
| 4374289 | Production of monofluorotrichloroethane 1-Fluoro-1,1,2-trichloroethane is produced by a process which comprises the reaction of trichloroethylene with hydrogen fluoride using about 1.5 to 3.5 moles of hydrogen fluoride per mole of trichloroethylene, and conducting the reaction in the presence o... | 02/15/1983 |
| 4331613 | Process for the preparation of trifluoromethylnaphthalenes A process for the preparation of an optionally substituted trifluoromethyl-naphthalene which comprises contacting a compound of the formula ##STR1## in which R1 denotes hydrogen, alkyl, aralkyl, aryl, aryloxy, arylthio, polyhalogenoal... | 05/25/1982 |
| 4139568 | Process for making methyl fluoride Methanol and aqueous HF react in the vapor phase at 250° C.-400° C. in the presence of activated carbon, nickel fluoride, chromium fluoride, aluminum fluoride, or a mixture thereof to produce methyl fluoride plus dimethyl ether as the principal by-produ... | 02/13/1979 |
| 3978145 | Use of hexagonal chromium (111) oxide hydroxide catalyst in fluorination process An improved process for the reaction of halogenated aliphatic compounds with HF using hexagonal --CrOOH as the catalyst to produce fluorine containing aliphatic compounds.... | 08/31/1976 |
