Method for preparing fluorination catalyst used to fluorinate halogenated hydrocarbons
US5849658A · kind A · utility
10Cited by
17References
8Claims
0Family size
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Key dates
| Filing date | May 5, 1995 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | May 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/206
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for preparing a fluorination catalyst is disclosed, wherein the catalyst contains chromium oxide, has a specific surface area of from 170 m.sup.2 g to 300 m.sup.2 /g, catalyzes the fluorination of a halogenated hydrocarbon with hydrogen fluoride, and has a high activity and long catalyst life. The method includes mixing an aqueous solution of a chromium salt with aqueous ammonia to precipitate chromium hydroxide, drying the precipitated chromium hydroxide, sintering the dried chromium hydroxide, and fluorinating the sintered chromium hydroxide to obtain the chromium oxide catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.