Process for the purification of 1,1,1,2-tetrafluoroethane
US5430205A · kind A · utility
3Cited by
1References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 26, 1994 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Oct 26, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/395
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In order to remove the olefinic impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a, hydrofluoric acid and oxygen or air is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature between 200.degree. and 350.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5 and the O.sub.2 /F134a molar ratio being between 0.001 and 0.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.