Extractive distillation process for separating difluoromethane and pentafluoroethane using methylene chloride
US6156161A · kind A · utility
8Cited by
8References
1Claims
0Family size
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Key dates
| Filing date | Jul 12, 1996 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jul 12, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for removing chloropentafluoroethane (CFC-115) from a mixture comprising CFC-115, difluoromethane (HFC-32), pentafluoroethane (HFC-125), or from mixtures of these compounds, by azeotropic or extractive distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.