Sulfur recovery process
US4041131A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1975 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Oct 14, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved sulfur recovery process is disclosed. Sulfur oxides are removed from stack gases with an acceptor. Sulfur oxides are recovered from the acceptor in a periodic regeneration step. The sulfur oxides in the regeneration off gas are concentrated by use of an absorber-stripper. The absorber absorbs sulfur oxides with an absorbent, and the stripper liberates concentrated sulfur oxides from the absorbent. Key feature of the process is use of two vessels to contain absorbent. Only when significant amounts of sulfur oxides are being absorbed is absorbent sent to a rich absorbent holding tank. Regenerated absorbent and absorbent from the absorber which does not contain much sulfur oxides are sent to the lean absorbent tank. Main advantage of operating with two tanks is optimum use of the stripper, which is fed with absorbent containing a constant and high concentration of sulfur oxides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.