Process for removing sodium sulfate from aqueous buffer solutions
US5108625A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Aug 22, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/60
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for removing sodium sulphate from an aqueous citrate, adipate or phosphate buffer solution used for absorption of SO.sub.2 from exhaust gases, by evaporating an aqueous buffer solution at atmospheric pressure at a temperature near its boiling point, thereafter separating the precipitated sodium sulphate and optionally subjecting it to further treatment to recover accompanying buffer salt. The further treatment may consist in a treatment of the precipitated sodium sulphate together with accompanying buffer salt with water at elevated temperature. The solution which is then obtained is mixed with the rest of the buffer solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.