Production of hydrogen fluoride
US4056604A · kind A · utility
6Cited by
9References
12Claims
0Family size
Inventors
Key dates
| Filing date | Aug 20, 1973 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Aug 20, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B7/194
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Hydrogen fluoride is recovered from hydrofluosilicic acid by-product of phosphoric acid manufacture. The hydrofluosilicic acid effluent is reacted with ammonia to form ammonium fluoride which is converted to a bifluoride by reaction with an excess of soluble metal fluoride. The bifluoride is readily recoverable and decomposable to yield hydrogen fluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.