Removal of sulfur dioxide from gas streams
US5202103A · kind A · utility
12Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Dec 20, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/464
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Processes are provided for the removal of sulfur dioxide from gas streams using aqueous lime or limestone slurries containing an additive comprising an amine. The amines have an available alkalinity of at least 0.5 meq/gram at a pH between 3.0 and 5.5. The amines are highly soluble in the slurry and can have a low volatility, thereby reducing amine losses with the gas product. Furthermore, amines which are absorbed on the calcium sulfate or calcium sulfite by-products can be recovered by water-washing with a water make-up stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.