Process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane
US5354928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | May 24, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane. The process which consists of gas phase catalytic fluorination of at least one pentahaloethane of formula C.sub.2 HX.sub.2-n F.sub.3+n in which X denotes a chlorine or bromine atom and n the number 0 or 1, by hydrofluoric acid, is characterized in that a catalyst is employed consisting of a catalytic quantity of chromium in an oxidation state equal to or greater than 3 and of an activated charcoal as support. The selectivity for 1,1,1,2-tetrafluorochloroethane and pentafluoroethane reaches approximately 95% and even more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.