Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions
US4956154A · kind A · utility
11Cited by
35References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 9, 1988 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Mar 9, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively separate chromium, nickel, cobalt, copper and lead cations from the aqueous solution. Typical extraction techniques include liquid-liquid extraction employing either mixer settlers or columns, liquid membrane extraction and selective supported membrane extraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.