Desulfurization process
US5059406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1990 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Apr 17, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/508
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The specification discloses a desulfurization process for use in a fossel fuel combustion process involving the generation of a flue gas product containing sulfur oxides and halogen compounds wherein an alkali metal compound is contacted with the gas resulting in the removal of sulfur oxides from the gas and formation of a water-soluble residue comprising alkali metal sulfates and alkali metal halides, which residue is collected from the gas before the gas is released to the environment. The process is adapted to recover the alkali metal ions from the collected residue for use in supplying the alkali metal ions that are contacted with the gas and for limiting the presence co-collected halogen ions within the recovered alkali metal ions. The process comprises dissolving the collected residue in water to form an aqueous solution thereof having a pH of less than about 8 so that sulfate ions, halogen ions and alkali metal ions are present in the solution. Thereafter, the solution is contacted with a weak base anion-exchange resin having bicarbonate groups associated therewith that exchange with sulfate and halogen ions in the solution so that the sulfate and halogen ions become associa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.