Recovery of hydrofluoric acid from aqueous fluosilicic acid
US3971845A · kind A · utility
7Cited by
8References
5Claims
0Family size
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Key dates
| Filing date | Sep 26, 1973 |
| Grant date | Jul 27, 1976 |
| Priority date | — |
| Expiry date | Sep 26, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Recovery of hydrofluoric acid from aqueous fluosilicic acid by treating said aqueous fluosilicic acid at a temperature of from 100.degree. to 300.degree.C. and under a pressure of from 3 to 80 atmospheres and separating resulting hydrogen fluoride containing aqueous phase and silicon tetrafluoride containing gaseous phase and optionally hydrolyzing the silicon tetrafluoride containing gaseous phase in aqueous medium and recycling the aqueous fluosilicic acid to the process as starting material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.