Process for the purification of flue and other waste gas
US4080428A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1975 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Aug 22, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C3/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is concerned with improved process and apparatus for the removal of sulphur dioxide from flue gas or other waste gas of the kind in which the waste gas is scrubbed by a circulating wash liquid containing lime suspensions, i.e. suspensions of calcium oxide, hydroxide or carbonate, the calcium/sulphur compounds so formed being oxidized and removed from the circulation, the improvements of the present invention comprising primarily the freeing of the wash liquid from solid matter before contact with the waste gas and then the control of pH values of the wash liquid at different stages of the circulation to facilitate, for example, the oxidation of the particular calcium/sulphur compound, formed in the scrubbing process, to calcium sulphate, the apparatus also being designed to improve the oxidation step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.