Quaternary polyamines as sulfite oxidation inhibitors in amine scrubbing of SO.sub.2
US5167941A · kind A · utility
22Cited by
15References
39Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1990 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Dec 6, 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. The scrubbing solutions contain amines such as piperazinones, morpholinones, piperidines, piperazines, piperazinediones, hydantoins, triazinones, pyrimidinones, oxazolidones, N-carboxymethyl ethylenediamines, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.