Process removing sulfur dioxide from gases
US3972980A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/501
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A sulfur dioxide containing gas stream is passed through a gas scrubber through which is circulated a scrubbing medium, preferably slurried, containing a reactant which reacts with the sulfur dioxide to produce sulfites and/or sulfates, a portion of which precipitate. At least a portion of the precipitated sulfites and/or sulfates are removed from the scrubbing medium which is rejuvenated with fresh reactant to maintain substantially steady state conditions in the scrubber. To minimize scaling in the scrubbing system, seed crystals of the sulfites and/or sulfates are introduced into the scrubbing medium, the seed crystals being in number and size so as to control the level of supersaturation of the scrubbing medium with respect to the sulfites and/or sulfates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.