Process for the manufacture of 1,1,1,3,3,3,-hexafluoropropane

Details Process for the manufacture of 1,1,1,3,3,3,-hexafluoropropane Process for the manufacture of 1,1,1,3,3,3,-hexafluoropropane

1994-07-29

1995-05-09

Siegel, Alan

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

Organic compounds

Halogen containing

570168, C07C 1708

Patent

active

054141656

ABSTRACT:
A process is disclosed for producing 1,1,1,3,3,3-hexafluoropropane with high selectivity. 1,1,1,3,3,3-hexachloropropane is contacted with hydrogen fluoride in the vapor phase at a temperature of from about 200.degree. C. to 400.degree. C. in the presence of a catalyst comprising trivalent chromium, to produce a fluorinated product containing CF.sub.3 CH.sub.2 CF.sub.3 and its haloprecursors (i.e., compounds which may be recycled for further reaction with HF) with a total selectivity of at least about 95 percent; and a sufficient amount of said haloprecursors is reacted with hydrogen fluoride in the vapor phase at a temperature of from 200.degree. C. to 400.degree. C. in the presence of a catalyst comprising trivalent chromium to provide an overall selectivity to 1,1,1,3,3,3-hexafluoropropane of at least about 95 percent based upon the amount of 1,1,1,3,3,3-hexachloropropane initially reacted with HF.

REFERENCES:
patent: 3859424 (1975-01-01), Scherer et al.
patent: 4843181 (1989-06-01), Gumprecht et al.
patent: 5036036 (1991-07-01), Lerou
patent: 5171901 (1992-12-01), Gassen et al.
patent: 5177273 (1993-01-01), Bruhnke
patent: 5347059 (1994-09-01), Pennetreau

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