Process for production of 1,1-dichloro-1-fluoroethane and/or 1-chloro-1,1-difluoroethane
US4996378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Jul 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
1,1-Dichloro-1-fluoroethane and/or 1-chloro-1,1-difluoroethane are selectively produced by fluorination of 1,1,1-trichloroethane. Conditions in a first reaction zone selected to preferentially form 1,1-dichloro-1-fluoroethane. The reaction effluent is split between a 1,1-dichloro-1-fluoroethane recovery system, and a second reaction zone. The effluent from the latter is routed to 1-chloro-1,1,-difluoroethane recovery system. The second reaction zone conditions are selected for form 1-chloro-1,1-difluoroethane. The ratio of product formed by the overall process may be varied from up to 98% 1,1-dichloro-1-fluoroethane to greater than 98% 1-chloro-1,1-difluoroethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.