Process for removing sulfur dioxide contained in a gas
US3974257A · kind A · utility
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3References
6Claims
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Key dates
| Filing date | Oct 22, 1974 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Oct 22, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A SO.sub.2 containing gas, for example a stack gas, is purified according to a multi-step process, which comprises washing said gas with an aqueous ammonia solution, treating the resulting solution with hydrochloric acid, whereby SO.sub.2 and an aqueous ammonium chloride solution are obtained and separated. The ammonium chloride solution is then reacted with magnesium oxide to recovery ammonia and the resulting magnesium chloride is cracked to produce hydrochloric acid and magnesium oxide, the ammonia, hydrochloric acid and magnesium oxide being recycled to the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.