Preparation of 1-chloro-2-trifluoromethyl-3,3,3-trifluoropropene from isobutane
US4081487A · kind A · utility
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Key dates
| Filing date | Dec 27, 1976 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Dec 27, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Isobutane is catalytically converted to 1-chloro-2-trifluoromethyl-3,3,3-trifluor propene [(CF.sub.3).sub.2 C = 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 prechlorinated, and the mixture of prechlorination fed for conversion to the desired (CF.sub.3).sub.2 C = CHCl, to a downstream fluorination reactor charged with the dehydro/chlorofluorination catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.