Removal of nitric acid from nitric acid-sulfuric acid mixtures
US4155989A · kind A · utility
4Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1977 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Nov 14, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/94
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Mixtures of nitric acid and sulfuric acid containing in excess of 70% sulfuric acid are denitrated by the addition of sufficient sulfur dioxide to such mixtures to convert the nitric acid to gaseous nitrogen oxides and vaporizing them from the solution in which they are formed. The process is particularly valuable for the treatment of spent nitration acids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.