Process for producing difluoromethane
US6346172B1 · kind B1 · utility
2Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1999 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Apr 13, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for refining difluoromethane by removing water which is contained in difluoromethane and has been believed to be difficult to be removed includes distilling difluoromethane which contains water so as to obtain difluoromethane as a distillate and a mixture as a bottom product of difluoromethane and chlorofluoromethane and/or dichloromethane which mixture contains water. The bottom product is recycled to a reaction step to be reused together with a feedstock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.