Method for producing potassium sulfate and sodium chloride from wastewater
US10773969B1 · kind B1 · utility
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25Claims
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Key dates
| Filing date | Nov 22, 2017 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Nov 22, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/37
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing potassium sulfate by employing sodium sulfate and potassium chloride sources is disclosed. The method includes a crystallization process that yields a mother liquor containing sulfate, sodium and chloride. The mother liquor is directed to an anion segregation unit that produces a reject or retentate rich in sulfate which is recycled and employed in the production of the potassium sulfate. Further, the anion segregation unit produces a permeate that is depleted in sulfate but includes sodium and chloride and is directed to a sodium chloride crystallizer for producing sodium chloride.
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