Preparation of bis(fluoromethy)ether and difluoromethane
US5344998A · kind A · utility
4Cited by
3References
9Claims
0Family size
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Key dates
| Filing date | Nov 4, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Nov 4, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C43/123
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of bis(fluoromethyl)ether by contacting formaldehyde with hydrogen fluoride in a reaction/distillation vessel. The reaction/distillation vessel is preferably a reaction/distillation column through which formaldehyde and hydrogen fluoride preferably flow in counter current. The bis(fluoromethyl)ether may be converted to difluoromethane, preferably by heating the bis(fluoromethyl)ether to elevated temperature in the presence of a metal, metal oxide, metal fluoride or metal oxyfluoride catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.