Azeotropic mixture of linear hydrofluorocarbon and HF

Details Azeotropic mixture of linear hydrofluorocarbon and HF Azeotropic mixture of linear hydrofluorocarbon and HF

1993-10-21

1995-04-25

Lieberman, Paul

Compositions

Vaporization, or expansion, refrigeration or heat or energy...

252 68, 252 69, 252162, 252172, 252364, 252DIG9, 570142, 203 67, C09K 504, C09K 318, C11D 730, C23G 5028

Patent

active

054096251

ABSTRACT:
Linear hydrofluorocarbons of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 F where X is H or F, and n is 1 to 7 when X is H and 0 to 7 when X is F, are produced by a vapor phase catalytic reaction of HF with corresponding compounds of the formula XCF.sub.2 (CF.sub.2).sub.n CH.sub.2 OY where Y is --(CO)Cl or --SO.sub.2 Cl. Azeotropic compositions with HF (e.g., an azeotrope of CHF.sub.2 CF.sub.2 CH.sub.2 F and HF) are provided, and a portion of the linear hydrofluorocarbon product (e.g., a portion of the CHF.sub.2 CF.sub.2 CH.sub.2 F) may be recovered as an azeotropic composition and recycled.

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