Quaternary polyamines as sulfite oxidation inhibitors
US5019365A · kind A · utility
16Cited by
14References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/502
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Inhibitors of oxidation of sulfites to sulfates in sulfur dioxide scrubbing solutions are disclosed. The inhibitors are cationic polyelectrolytes which are water soluble, have a molecular weight of at least 10,000 daltons and contain quaternary amine groups. The polyelectrolytes are preferably present at 1-3000 ppm in alkali solutions with which a sulfur dioxide containing gas stream is contacted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.