Limestone-gypsum flue gas desulfurization process
US4487784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1982 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Feb 22, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/501
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A flue gas desulfurization process capable of producing a high purity gypsum and also making equipment employed as minimum as possible is provided, which process comprises the steps of cooling and dedusting flue gas containing SO.sub.x ; contacting the cooled gas with a slurry containing limestone to remove SO.sub.x by absorption and also form CaSO.sub.3 ; controlling the pH of the resulting slurry and then blowing air therein to form gypsum; and separating gypsum from the resulting slurry. As a modification of the above process, the slurry of the above second absorption step is further fed to the above first cooling step where unreacted limestone and SO.sub.x are reacted to form CaSO.sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.