Process for cleaning flue gas
US4267155A · kind A · utility
4Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Aug 20, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A flue gas containing SO.sub.x, NO.sub.x and O.sub.2 is washed with an alkaline aqueous solution containing a NO.sub.x removal catalyst to form the salts of a dithionate, a sulfate and an imidobissulfate. The salts are crystallized, separated and heated for pyrolysis by a pneumatic conveying pyrolysis unit whereby a gas containing higher concentration of SO.sub.2 is obtained. The gas is fed into the alkaline aqueous solution together with the flue gas so as to improve the efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.