Functionalized Copolymers of Terminally Functionalized Perfluoro (Alkyl Vinyl Ether) Reactor Wall for Photochemical Reactions, Process for Increasing Fluorine Content in Hydrocaebons and Halohydrocarbons and Olefin Production
PROCESS FOR DEHYDROHALOGENATION OF HALOGENATED ALKANES
申请人:Cook George R.
公开号:US20110269999A1
公开(公告)日:2011-11-03
A process for the manufacture of halogenated olefins in semi-batch mode by dehydrohalogenation of halogenated alkanes in the presence of an aqueous base such as KOH which simultaneously neutralizes the resulting hydrogen halide. During the process, aqueous base is continuously added to the haloalkane which results in better yields, lower by-product formation and safer/more controllable operation.
[EN] PROCESS FOR THE PREPARATION OF 1,1,1,3,3-PENTAFLUOROPROPANE AND 1,1,1,2,3-PENTAFLUOROPROPANE<br/>[FR] PROCEDE D'ELABORATION DE 1,1,1,3,3-PENTAFLUOROPROPANE ET DE 1,1,1,2,3-PENTAFLUOROPROPANE
申请人:DU PONT
公开号:WO2005037743A1
公开(公告)日:2005-04-28
A process is disclosed for the manufacture of CF3CH2CHF2 and CF3CHFCH2F. The process involves (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX3CCl=CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CClF2 and CF3CClFCCl2F; (b) reacting CF3CCl2CClF2 and CF3CClFCCl2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2, and CF3CHFCH2F; and (c) recovering CF3CH2CHF2 and CF3CHFCH2F from the product produced in (b). In (a), the CF3CCl2CClF2 and CF3CClFCCl2F are produced in the presence of a chlorofluorination catalyst including a ZnCr2O4/crystalline α-chromium oxide composition, a ZnCr2O4/crystalline α-chromium oxide composition which has been treated with a fluorinating agent, a zinc halide/α-chromium oxide composition and/or a zinc halide/α-chromium oxide composition which has been treated with a fluorinating agent.
Method of dechlorinating organic compounds comprising vicinal chlorides
申请人:Honeywell International Inc.
公开号:US07473810B1
公开(公告)日:2009-01-06
Provided is a method for selectively preparing 2-chloropentafluoropropene comprising catalytic dechlorination of 1,2,2-trichloro-1,1,3,3,3-pentafluoropropane in the presence of hydrogen and a noble metal catalyst. Also provided is method for dechlorinating a vicinal chloride substituted organic compound using a palladium/barium sulfate catalyst.
Carboxylic acids can be prepared by reacting compounds comprising a -CCl2F group, a CCIF2 group or a CCl3 group with sulfur trioxide and sulfuric acid. The reaction is especially suitable for the preparation of 3,3,3-trifluoropropionic acid from CF3-CH2-CCl2F, CF3-CH2-CCIF2, CF3-CH2-CCl3 or a mixture of one or two thereof as starting material. Usually, oleum is used as the source for sulfur trioxide.
In a preferred embodiment, the starting material comprises CF3-CH2-CCl2F and/or CF3-CH2-CCIF2 which is or are prepared in a fluorination reaction between CCl3-CH2-CCl3 and HF. As a source for CCl3-CH2-CCl2, the product of the reaction between CH2=CCl2 and CCl4 is advantageously used.
Process for the preparation of 1,1,1,3,3-pentafluoropropane
申请人:AlliedSignal Inc.
公开号:US05728904A1
公开(公告)日:1998-03-17
This invention is related to the preparation of hydrofluorocarbons (HFCs). Specifically, it relates to the manufacture of 1,1,1,3,3-pentafluoropropane, CF.sub.3 CH.sub.2 CF.sub.2 H (HFC-245fa) by the steps comprising (1) the formation of CCl.sub.3 CH.sub.2 CCl.sub.3 by the reaction of CCl.sub.4 with vinylidene chloride; (2) the conversion of CCl.sub.3 CH.sub.2 CCl.sub.3 to CF.sub.3 CH.sub.2 CF.sub.2 Cl by reaction with HF in the presence of a fluorination catalyst, selected from TiCl.sub.4, SnCl.sub.4 or mixtures thereof; and (3) reduction of CF.sub.3 CH.sub.2 CF.sub.2 Cl to CF.sub.3l CH.sub.2 CF.sub.2 H.