Process for the purification of 1,1,1,2-tetrafluoroethane
US6395941B1 · kind B1 · utility
1Cited by
3References
17Claims
0Family size
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Key dates
| Filing date | Jul 3, 1997 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/395
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In order to remove the impurities (in particular 1-chloro-2,2-difluoroethylene) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a and hydrofluoric acid is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature of between 200 and 380° C. and under a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.