Production of difluoromethane
US5672786A · kind A · utility
8Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Sep 6, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of difluoromethane comprising (a) contacting dichloromethane with hydrogen fluoride in the presence of a fluorination catalyst to produce a product stream comprising difluoromethane, monochloromonofluoromethane and unreacted starting materials and (b) separating difluoromethane from the product stream from step (a), wherein sufficient hydrogen fluoride is employed in the process such that during step (b) the molar ratio of hydrogen fluoride to monochloromonofluoromethane is at least about 100:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.