Removal of noxious contaminants from gas
US4222993A · kind A · utility
19Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1977 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Nov 28, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C3/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Gas contaminated with at least one noxious component, such as SO.sub.2, HF or NO.sub.x, is scrubbed with a clear, calcium-containing, initially-basic washing liquid which also comprises the anion of a strong inorganic acid, that of a polybasic carboxylic acid and, optionally, that of a monobasic carboxylic acid. Apparatus is provided for scrubbing the gas, oxidizing produced calcium bisulfite to calcium sulfate, separating out and removing solids, and recirculating clarified liquid for scrubbing contaminated gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.