Process for recovering elemental sulfur from gases having a high carbon dioxide content and containing sulfur compounds
US4060595A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1976 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | Jul 14, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/0456
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for recovering elemental sulfur from gases containing inorganic and/or organic sulfur compounds together with large quantities of carbon dioxide and other possible impurities such as unsaturated hydrocarbon and hydrogen cyanide. The waste gas is combined with a combustion-promoting gas and the resulting mixture is burned with a slight excess of air and caused to contact coke at a temperature of 300.degree. to 450.degree. C. The resulting gas, from which oxygen, sulfur trioxide and nitrogen oxide have been removed, by contact with the coke, is cooled to 20.degree. to 80.degree. C and then is scrubbed with aqueous alkali salts of weak inorganic and/or organic acids or amines to remove SO.sub.2. The absorbent is stripped and the recovered SO.sub.2 is reacted with hydrogen at 200.degree. to 400.degree. C to form sulfur and/or hydrogen sulfide and, when hydrogen sulfide is produced, the latter is reacted on alumina or activated carbon at 200.degree. to 300.degree. C to produce the elemental sulfur. All or part of the gas after recovery of the elemental sulfur is recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.