Method and device for processing a gas containing hydrogen sulfide and sulfur dioxide, comprising a stage of removal of solid by-products
US6277352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Oct 7, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for processing a gas containing at least hydrogen sulfide (H.sub.2 S) and at least sulfur dioxide (SO.sub.2), includes the following stages: contacting the gas with a liquid solvent, such as polyethylene glycol, containing at least one catalyst, such as sodium salicylate, in a contacting stage, recovering a gaseous effluent substantially containing no hydrogen sulfide and no sulfur dioxide, and a mixture containing liquid sulfur, liquid solvent and solid by-products such as alkali metal or alkaline earth metal sulfates or thiosulfates, resulting from the degradation of the catalyst, separating the liquid sulfur from the liquid solvent in a decantation zone, extracting a liquid fraction F containing at least the solid by-products from a layer between the liquid solvent and the liquid sulfur in the decantation zone, sending the liquid fraction F to a processing stage distinct from the contacting stage, and recovering at least a stream F, comprising most of the solid by-products and a stream F.sub.2 mostly comprising solvent nearly free of the solid by-products from the processing stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.