Production of hydrogen fluoride
US4144315A · kind A · utility
7Cited by
13References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Aug 15, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D3/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Hydrogen Fluoride is manufactured from fluorosilicic acid. The fluorosilicic acid is reacted with ammonia to produce aqueous ammonium fluoride and solid silica. The ammonium fluoride is hydrolised in the presence of a mixture of ammonium fluoride and ammonium bifluoride, and the net production of ammonium bifluoride is converted to sodium bifluoride. The sodium bifluoride is decomposed by heating to hydrogen fluoride gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.