Process for gaseous phase fluorination of aliphatic chlorinated or chlorofluorinated hydrocarbons
US4876406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1984 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | Nov 8, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to improved catalysts for gaseous phase fluoridation of aliphatic chlorinated and chlorofluorinated hydrocarbons by hydrofluoric acid. The catalysts comprise chromium salts or oxides complexed with aluminum phosphate and are characterized by a total specific surface area greater than about 200 m.sup.2 /g, but less than about 1000 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 150 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 60 m.sup.2 /g. This invention also relates to gaseous phase fluoridation processes for chlorinated or chlorofluorinated derivatives utilizing these catalysts in fluidized bed reactors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.