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

1994-12-08

1996-08-13

Siegel, Alan

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

Organic compounds

Halogen containing

570169, C07C 1708

Patent

active

055457746

ABSTRACT:
A process is disclosed for producing 1,1,1,3,3,3-hexafluoropropane. The process involves contacting 1,1,1,3,3,3-hexachloropropane with hydrogen fluoride in the vapor phase at a temperature of from about 250.degree. C. to 400.degree. C. in the presence of a catalyst of trivalent chromium supported on carbon. The carbon has an ash content sufficiently low to produce CF.sub.3 CH.sub.2 CF.sub.3 with a selectivity of at least about 70 percent based upon the amount of 1,1,1,3,3,3-hexachloropropane reacted with HF.

REFERENCES:
patent: 3632834 (1972-01-01), Christoph, Jr.
patent: 3859424 (1975-01-01), Scherer et al.
patent: 5171901 (1992-12-01), Gassen et al.
patent: 5414165 (1995-05-01), Nappa et al.
M. Belbachir, et al., "Telomerisation Du Chlorure De Vinylidene, 1 Reaction Avec Le Tetrachlorure De Carbone Par Catalyse Redox", Makromol. Chem., 185, 1583-1595 (1984).

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