Process for the recovery of antimony-based catalysts used for the fluorination of halgenated hydrocarbons
US5198199A · kind A · utility
1Cited by
3References
10Claims
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Key dates
| Filing date | Jan 29, 1992 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Jan 29, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To recover the antimony contained in a solution of use antimony-containing catalyst, emananting from units for the fluorination or chlorofluorination of halogenated hydrocarbons comprising at least two carbon atoms, the solution is concentrated to the limit of distillation of antimony trichloride, an excess of chlorine is then added to convert SbCl.sub.3 to SbCl.sub.5, and SbCl.sub.5 is distilled under reduced pressure without exceeding 120.degree. C. The recoverd antimony pentachloride is sufficiently pure to be able to be recycled directly to the fluorination reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.