Process for regenerating brines containing sodium sulfites and sulfates
US4164543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1977 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | Dec 28, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/501
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for regenerating brines containing simultaneously sodium sulfites and sulfates so as to produce sulfur dioxide and an alkaline solution usable for absorbing sulfur dioxide, comprising contacting the brine with ammonium bisulfate, sodium bisulfate and ammonium sulfite to produce sulfur dioxide and an enriched solution of sodium sulfate and ammonium sulfate, which is reacted with CO.sub.2 and ammonia to obtain solid sodium bicarbonate which is decomposed to form CO.sub.2 and an enriched solution of ammonium sulfate, containing dissolved ammonium bicarbonate, which is heated with a reducing agent so as to decompose the ammonium sulfate to ammonia and ammonium bisulfate which is partly reduced to gaseous ammonia and sulfur dioxide, said process including several recycling steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.