Oxidative removal of hydrogen sulfide from gaseous streams
US4278646A · kind A · utility
25Cited by
3References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Nov 7, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Hydrogen sulfide is removed from a gaseous stream by contacting the stream with an aqueous solution of ferric ion chelated with an aminopolycarboxylic acid at a pH of 3.5 to 5, whereby hydrogen sulfide is oxidized to elemental sulfur and chelated ferric ion is reduced to chelated ferrous ion. The solution also contains ammonia or an aliphatic, alicyclic, or heterocyclic primary or secondary amine in a sufficient proportion to maintain chelated ferrous ion in solution at a pH of 3.5 to 5. The chelated ferric ion is regenerated by contacting the solution with a gas containing elemental oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.