Process for the extraction of hydrogen sulphide from a gas mixture
US5670123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the extraction of hydrogen sulphide from a gas mixture comprises: a step (a) in which the gas mixture is passed into an aqueous acidic solution of copper sulphate under conditions which lead to the formation of copper sulphide; a gas which is highly depleted in hydrogen sulphide and an aqueous phase containing copper sulphide in suspension are recovered; a step (b) in which the copper sulphide contained in suspension in the aqueous phase from step (a) is oxidised using an oxygen-containing gas under conditions which lead to the formation of solid elemental sulphur and soluble copper sulphate from this liquid phase; and a step (c) in which the solid sulphur and the solid copper sulphide which is not transformed during step (b) are separated and at least a portion of the aqueous acidic phase containing the copper sulphate formed during step (b) is optionally recycled to step (a). The process is used to absorb hydrogen sulphide contained in a variety of industrial gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.