Azeotropic mixture of 1,1-difluoroethane and hydrogen fluoride and production process of 1,1-difluoroethane
US5846388A · kind A · utility
5Cited by
7References
6Claims
0Family size
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Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/383
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is provided an azeotropic mixture of hydrogen fluoride (HF) and 1,1-difluoroethane (HFC152a). In addition, there is provided a process for the production of HFC152a having a step of more effectively recovering HF which does not contain HFC152a or HFC152a which does not contain HF in which step an azeotropic mixture is distilled off from a column top by subjecting a mixture containing HFC152a and HF, so that HF which does not contain HFC152a or HFC152a which does not contain HF is recovered from a column bottom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.