Process using rare earths to remove oxyanions from aqueous streams
US7338603B1 · kind B1 · utility
16Cited by
14References
33Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 27, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Jun 26, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2307/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Oxyanions of various contaminant elements, such as chromium, antimony, molybdenum, tungsten, vanadium and uranium, are removed from water and other aqueous feeds by treating the feed with (1) a sorbent comprising one or more rare earth compounds, usually mixed or supported on particulate solids having a cation exchange capacity less than 20 milliequivalents per 100 grams or (2) an aqueous solution of one or more soluble rare earth compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.