Method of recovering sulfurous components in a sulfur-recovery process
US6645459B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Nov 11, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
H2S is removed from an H2S-rich gas, and sulfur is produced, by a process in which the H2S-rich gas is reacted with SO2 in a reactor in the presence of an organic solvent and a catalyst, an H2S-containing off-gas is removed from the reactor and is combusted to produce an SO2-rich combustion gas. Preferably, the reactor off-gas is combusted with a substoichiometric amount of oxygen so that the combustion gas also contains water vapor and sulfur vapor. The combustion gas is cooled by direct quench or indirect heat exchange to produce an aqueous stream comprising primarily water and containing suspended solid sulfur and polythionic acids, e.g., a Wackenroder's liquid, and the aqueous stream is used to provide cooling for the H2S—SO2 reaction. Problems associated with production and handling of Wackenroder's liquids are overcome and sulfur values in these materials are recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.