Preparation of 1-chloro-2-trifluoromethyl-3,3,3-...

Details Preparation of 1-chloro-2-trifluoromethyl-3,3,3-... Preparation of 1-chloro-2-trifluoromethyl-3,3,3-...

C - Chemistry, Metallurgy

07

C

260/657.2

C07C 21/18 (2006.01) C07C 17/10 (2006.01)

Patent

CA 1095938

PREPERATION OF l-CHLORO-2-TRIFLUOROMETHYL- 3,3,3-TRIFLUOROPROPENE FROM ISOBUTYLENE ABSTRACT OF THE DISCLOSURE Isobutylene is catalytically converted to l-chloro-2- trifluoromethyl-3,3,3-trifluoropropene [(CF3)2C = CHCl] in a hlorofluorination reaction zone by passing a mixture of anhydrous ydrogen fluoride, chlorine and the isobutylene over a chromium oxide or metal fluoride chlorofluorination catalyst. Alterna- tively, the lsobutvlene feed is first prechlorinated, and the nixture of prechlorination fed for conversion to the desired (CF3)2C = CHCl, to a downstream fluorination reactor charged with the chlorofluorination catalyst. The l-chloro-2-trifluoromethyl- 3,3,3-trlfluoropropene product is of value as an intermediate in the preparation of hexafluoroisobutylene.

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