Preparation of 1-chloro-2-trifluoromethyl-3,3,3-trifluoropropene from isobutane
US4110407A · kind A · utility
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17Claims
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Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
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-trifluoropropene [(CF.sub.3).sub.2 C .dbd. 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 .dbd. CHCl, to a downstream fluorination reactor charged with the dehydro/chlorofluorination catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.