Extracting chromium (III) from aqueous solutions with 2-ethylhexyl acid phosphate
US4436705A · kind A · utility
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5References
10Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 1, 1983 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Aug 1, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention concerns a process for extracting chromium (III) from an aqueous solution containing chromium (III) with an extractant comprising a mixture of mono-2-ethylhexyl phosphoric acid and di-2-ethylhexyl phosphoric acid. An organic solvent such as a low aromatic kerosene is employed in this invention for dilution and dissolution of the extractant. Aqueous acid waste streams containing chromium (III) can be reduced to a chromium (III) concentration of 80 ppm thereby enabling the stream to be reclaimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.