Process for removing 2-chloro-1,1-difluoroethylene from 1,1,1,2-tetrafluoroethane and co-producing 2-chloro-1,1,1,2-tetrafluoroethane
US5336377A · kind A · utility
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11References
8Claims
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Key dates
| Filing date | Dec 18, 1991 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Dec 18, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/17
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2-Chloro-1,1-difluoroethylene (R-1122) is removed from 1,1,1,2-tetrafluoroethane (R-134a) by contacting the R-134a in the vapor phase with chlorine in the presence of ultraviolet light providing an exposure of at least about 2 watts-hour/kg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.