Aluminum fluoride catalyst compositions and use thereof in a chlorofluorination process for preparing 1,1-dichloro-1,2,2,2-tetrafluoroethane
US5243108A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1992 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Apr 7, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A catalyst composition is disclosed which consists essentially of an aluminum fluoride prepared by the reaction of aluminum hydroxide and HF. Also disclosed is a process for preparing 1,1,-dichloro-1,2,2,2-tetrafluoroethane by chlorofluorination which comprises the step of contacting a gaseous mixture comprising at least one tetrahaloethylene having the formula C.sub.2 Cl.sub.4-x F.sub.x wherein x is an integer from zero to 3 and both Cl.sub.2 and HF with said catalyst composition at an elevated temperature; and a process for producing 2-chloro-1,1,1,2-tetrafluoroethane and/or 1,1,1,2-tetrafluoroethane by hydrodechlorinating 1,1-dichloro-1,2,2,2-tetrafluoroethane prepared by said chlorofluorination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.