Production of H.sub.2 S from SO.sub.2 obtained from flue gas
US4141961A · kind A · utility
11Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1977 |
| Grant date | Feb 27, 1979 |
| Priority date | — |
| Expiry date | Jun 16, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention is a process for producing gaseous hydrogen sulfide in concentrated form from sulfur dioxide obtained from a dilute gas source by (1) reacting the SO.sub.2 with Na.sub.2 CO.sub.3 to form Na.sub.2 SO.sub.3, (2) reducing the Na.sub.2 SO.sub.3 to Na.sub.2 S, (3) reacting the Na.sub.2 S with NaHCO.sub.3 to form H.sub.2 S and Na.sub.2 CO.sub.3, (4) recycling part of the Na.sub.2 CO.sub.3 to the SO.sub.2 reaction step, (5) reacting the remainder of the Na.sub.2 CO.sub.3 with CO.sub.2 and H.sub.2 O to form NaHCO.sub.3 and (6) recycling the NaHCO.sub.3 to the H.sub.2 S formation reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.