Process for removing sulfur dioxide from a gas and producing sulfur therefrom
US4036943A · kind A · utility
8Cited by
11References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1975 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Nov 18, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/501
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A SO.sub.2 -containing gas is contacted with an ammonia solution, the resulting ammonium sulfite solution is vaporized to SO.sub.2 and NH.sub.3 , SO.sub.2 is partially reduced to H.sub.2 S and the resulting gas containing both SO.sub.2 and H.sub.2 S is first contacted with a catalyst to produce sulfur and then made free of sulfur by solvent washing; recovered NH.sub.3 is used to re-constitute the ammonia solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.