Process for the preparation of 1,1,1,2,2-pentafluoroethane
US6268541A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a process for the preparation of 1,1,1,2,2-pentafluoroethane by fluorinating in the gas phase a halogenated hydrocarbon feedstock containing 2-chloro-1,1,1,2-tetrafluoroethane with hydrogen fluoride, the process being characterized in that: PA0 (i) a fluorinated chromium oxide obtained by fluorinating a chromium oxide represented by the formula: CrOm (1.5<m<3) is used as the catalyst, PA0 (ii) the mixing ratio (by mole) of hydrogen fluoride to halogenated hydrocarbon feedstock ranges from 1.5 to 10, and PA0 (iii) the fluorination is conducted at a temperature of 250 to 350.degree. C. The process makes it possible to prepare easily HFC-125 reduced in the contents of CFCs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.