Process for recovering sulfur from H2S-bearing gas
US6495117B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2000 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Jun 20, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/8612
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Elemental sulfur is recovered from the hydrogen sulfide present in natural gases and other process gases by treating the hydrogen sulfide-containing gas in a series arrangement of a liquid-phase reactor; a furnace and a sulfur dioxide absorber. The hydrogen sulfide-containing gas and a sulfur dioxide-containing gas are fed into the liquid-phase reactor where they are dissolved into a solvent, such as polyglycol monoethers, diethers of ethylene glycol, diethers of propylene glycol, etc., and react in the presence of a catalyst, such as tertiary amine, pyridine, isoquinoline, etc., to produce elemental sulfur. The feed rates of the hydrogen sulfide-containing gas and the sulfur dioxide-containing gas are selected so that there will be an excess of hydrogen sulfide in the solvent thereby ensuring that the reaction products will include, not only the elemental sulfur, but also residual, unreacted hydrogen sulfide. The residual, unreacted hydrogen sulfide is fed into a furnace, where it is combusted into a sulfur dioxide-containing gas. The sulfur dioxide-containing gas is fed into a sulfur dioxide absorber, where the sulfur dioxide is extracted from the gas and recycled back to the liq…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.