Process for the continuous recovery of hydrogen fluoride gas
US5032371A · kind A · utility
6Cited by
2References
9Claims
0Family size
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Inventor
Key dates
| Filing date | Jul 7, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 7, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A continuous process for the recovery of anhydrous hydrogen fluoride gas by contacting an aqueous solution of an alkali metal fluoride in hydrofluoric acid with a sulfur-containing dehydrating stream. The dehydrating stream preferably consists of sulfur trioxide dissolved in sulfuric acid. The desired product is obtained in high yield and purity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.