Process for removing nitrogen oxides from gaseous mixtures
US4086327A · kind A · utility
1Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Oct 12, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Gaseous mixtures containing nitrogen oxides are contacted with an aqueous solution containing sodium sulfite, trisodium imidobissulfate and sodium sulfate while adjusting the pH thereof by sodium hydroxide or sodium carbonate, and sulfur dioxide is contacted therewith simultaneously or thereafter to produce therein disodium imidobissulfate and sodium hydrogensulfate, and then sodium hydroxide is added therein to deposit sodium sulfate 10 hydrate firstly and trisodium imidobissulfate 1 hydrate secondly, and thereafter the mother liquor is recycled as the absorption medium for nitrogen oxides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.