Desulfurization process for hydrogen sulfide-containing gases
US4002727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1974 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Dec 16, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a process for desulfurizing hydrogen sulfide-containing gases by contacting a hydrogen sulfide-containing gas with an alkaline aqueous solution containing a naphthoquinonesulfonate to effect absorption of hydrogen sulfide by said aqueous solution and subjecting the effluent to catalytic oxidation by a molecular oxygen-containing gas to separate out sulfur, an improvement which comprises (a) carrying out the absorption of hydrogen sulfide by using a liquid absorbent having a pH value adjusted by means of ammonia to 8 to 10 and containing as catalyst components a naphthoquinonesulfonate and a variable valent metal compound, (b) carrying out the catalytic oxidation of the effluent containing absorbed therein hydrogen sulfide by means of a molecular oxygen-containing gas as to lower the concentration of hydrosulfide ion in the effluent to 70 ppm or less and (c) recirculating the said liquid absorbent or effluent to the contact with the said hydrogen sulfide-containing gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.