Preparation of 1-chloro-2-trifluoromethyl-3,3,3-trifluoropropene from isobutylene

摘要

Isobutylene is catalytically converted to 1-chloro-2-trifluoromethyl-3,3,3-trifluoropropene [(CF3)2C = CHCl] in a chlorofluorination reaction zone by passing a mixture of anhydrous hydrogen fluoride, chlorine and the isobutylene over a chromium oxide or metal fluoride chlorofluorination catalyst. Alternatively, the isobutylene feed is first prechlorinated, and the mixture of prechlorination fed for conversion to the desired (CF3)2C = CHCl, to a downstream fluorination reactor charged with the chlorofluorination catalyst.