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 17/00 (2006.01) C07C 17/04 (2006.01)

Patent

CA 1091256

PREPARATION OF 1-CHLORO-2-TRIFLUOROMETHYL- 3, 3, 3-TRIFLUOROPROPENE FROM ISOBUTANE ABSTRACT OF THE DISCLOSURE Isobutane is catalytically converted to 1-chloro-2- trifluoromethyl-3,3,3-trifluoropropene [(CF3)2C = CHCl] in a dehydro/chlorofluorination reaction zone by passing a mixture of anhydrous hydrogen fluoride, chlorine and the isobutane over a chromium oxide or metal fluoride dehydro/chlorofluorination catalyst. Alternatively, the isobutane feed is first prechlorina- ted, and the mixture of prechlorination fed for conversion to the desired (CF3)2C = CHCl, to a downstream fluorination reactor charged with the dehyro/chlorofluorination catalyst. The 1-chloro-2-trifluoromethyl-3,3,3-trifluoropropene product is of value as an intermediate in the preparation of hexafluoroisobuty- lene.

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