Removal of arsenic from hydrogen fluoride
US4491570A · kind A · utility
9Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1984 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | May 3, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B7/195
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Arsenic impurities are removed from anhydrous hydrogen fluoride by treating the hydrogen fluoride with elemental chlorine and anhydrous hydrogen chloride or a fluoride salt or both and then separating the purified anhydrous hydrogen fluoride, preferably by distillation, from the nonvolatile arsenic compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.