Patent ID: RE45076

Claim:
A process for the preparation of fluorine-containing olefins comprising contacting a chlorofluoroalkene having the formula R f CCl═CClR f wherein each R f is a perfluoroalkyl group independently selected from the group consisting of CF 3 , C 2 F 5 , n-C 3 F 7 , i-C 3 F 7 , n-C 4 F 9 , i-C 4 F 9 and t-C 4 F 9 , and wherein one of the R f groups may be F with hydrogen in the presence of a catalyst at a temperature sufficient to cause replacement of the chlorine substituents of the chlorofluoroalkene with hydrogen to produce a product mixture comprising a fluorine-containing olefin having the formula E- or Z—R 1 CH═CHR 2 , and optionally, a chlorofluoroolefin having the formula E- or Z—R 1 CCl═CHR 2 , wherein each of R 1 and R 2 are, perfluoroalkyl groups independently selected from the group consisting of CF 3 , C 2 F 5 , n-C 3 F 7 , i-C 3 F 7 , n-C 4 F 9 , i-C 4 F 9 and t-C 4 F 9 , and wherein R 2 may be F , wherein the catalyst selected from the group consisting of copper on carbon, copper on calcium fluoride, palladium on barium sulfate, palladium/barium chloride on alumina, Lindlar catalyst (palladium on CaCO 3 , poisoned with lead), palladium on calcium fluoride poisoned with lead, copper and nickel on carbon, nickel on carbon, nickel on calcium fluoride, copper/nickel/chromium on calcium fluoride and unsupported alloys of copper and nickel .