Process for efficiently purifying industrial gas
US3943228A · kind A · utility
5Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1973 |
| Grant date | Mar 9, 1976 |
| Priority date | — |
| Expiry date | Nov 27, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01C1/246
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Sulfur dioxide and ammonia remaining in waste-gas after partial purification thereof, for example by means of ammonia or ammonium sulfite solutions, are withdrawn from said gas by washing with a diluted aqueous solution of ammonium sulfate; the resulting ammonium sulfite containing solution is oxidized thereafter either by means of air or in an electrochemical cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.