Catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated hydrocarbons
US4474895A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1981 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Nov 24, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J35/647
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to improved catalysts for gaseous phase fluorination of aliphatic chlorinated and chlorofluorinated hydrocarbons by hydrofluoric acid. The catalysts are characterized by an active carbon support having a total specific surface area greater than about 1000 m.sup.2 /g but less than about 2000 m.sup.2 /g, a surface area of pores of 40 to 50 .ANG. in radius above about 5 m.sup.2 /g but less than about 15 m.sup.2 /g, a surface area of pores greater than or equal to 250 .ANG. in radius above about 2 m.sup.2 /g but less than about 6 m.sup.2 /g, which has been impregnated with an aqueous chromium trioxide solution and dried. This invention also relates to gaseous phase fluorination processes for chlorinated or chlorofluorinated derivatives utilizing these catalysts in fluidized bed reactors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.