Producing CF.sub.3 CH.sub.2 CF.sub.3 and/or CF.sub.3 CH.dbd.CF.s

Details Producing CF.sub.3 CH.sub.2 CF.sub.3 and/or CF.sub.3 CH.dbd.CF.s Producing CF.sub.3 CH.sub.2 CF.sub.3 and/or CF.sub.3 CH.dbd.CF.s

1995-04-13

1997-01-14

Evans, Joseph E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570159, C07C 17363, C07C 17361, C07C 1908, C07C 2118

Patent

active

055941591

ABSTRACT:
A process is disclosed for producing 1,1,1,3,3,3-hexafluoropropane and/or 1,1,1,3,3-pentafluoropropene from (CF.sub.3).sub.2 CHCOOH and/or its water soluble salts. The process involves providing a mixture containing water and such carboxy compound(s) which has a pH of less than about 4, and reacting the mixture at a temperature of at least about 75.degree. C. Certain ether compounds may be included in the mixture along with (CF.sub.3)2 CHCOOH and/or its water soluble salts. The reaction of the carboxy (and optionally ether) compound(s) with water may be employed in connection with a process for producing tetrafluoroethylene and/or hexafluoropropylene by pyrolysis, where by-product perfluoroisobutylene is reacted with water (and optionally an alkanol) to produce (CF.sub.3).sub.2 CHCOOH (and optionally one or more ether compounds).

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Hall, C. Richard et al, "Protection provided by activated carbon vapour filters against perfluoroisobutene", Chem. Ind. (London), 5, 145-156 (1989).
Kocharyan, S. T. et al, "Alkylating Properties of Alkyl Perfluoroisobutenyl Ethers: Communication 1. Complexes of Alkyl Perfluoroisobutenyl Ethers with Trialkylamines", translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 4, 846-854, Apr. 1968.
Aktaev, N. P. et al, "Comparison of the Electronic Effects of the Nitrile and Trifluoromethyl Groups", translated from Izventiya Akademiya Nauk SSSR, Seriya Khimicheskaya, 5, 1112-1117, May 1977.
Cheburkov, Yu. A. et al, "Bistrifluoromethylketene and Perfluoromethacrylic Acid: Communication 4. Pyrolysis of some Derivatives of .alpha.-Hydrohexafluoroisobutyric Acid", translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 9, 1573-1576, Sep. 1963.
Chemical Abstracts, 109:189842 (1988) re JP-63-035539.

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