Production of alkali metal sulfates
US4371512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1981 |
| Grant date | Feb 1, 1983 |
| Priority date | — |
| Expiry date | Feb 3, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/96
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Alkali metal sulfates are produced from an aqueous solution containing alkali metal hydrogen sulfate which comprises contacting the aqueous solution of alkali metal hydrogen sulfate with a hydrophilic solvent, the hydrophilic solvent being effective to extract at least a portion of the sulfuric acid formed as the alkali metal hydrogen sulfate is converted to alkali metal sulfate in the solution, together with at least a portion of the water present; permitting the alkali metal sulfate solid to crystallize; and recovering the solid alkali metal sulfate product. The hydrophilic solvent may then be extracted and separated from the sulfuric acid with a hydrophobic solvent and both solvents can be recovered and recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.