Process for continuous liquid phase reaction of hydrogen fluoride and 1,1,1-trichloroethane to provide 1,1-dichloro-1-fluoroethane and 1-chloro-1, 1-difluoroethane mixtures
US5608124A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 1, 1992 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | May 1, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A continuous non-catalytic process for the manufacture of 1,1-dichloro-1-fluoroethane/1-chloro-1,1-difluoroethane mixtures from 1,1-dichloro-1-fluoroethane is provided. Hydrogen fluoride and 1,1,1-trichloroethane are continuously feed a molar ratio of from about 3.0 to about 5.2 to form a liquid phase hydrofluorination reaction mixture. Vapor phase reaction product is continuously withdrawn from the reaction zone, and hydrogen fluoride is continuously selectively refluxed back to the reaction mixture. 1,1,1-Trichloroethane utilization approaches 100% , with selectivity for 1,1-dichloro-1-fluoroethane between 15% and 85%, based upon the amount of 1,1-dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane contained in the gaseous reaction product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.