Membrane extraction with thermodynamically unstable diphosphonic acid derivatives
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with metal ions, and especially metal ions in the II, III, IV, V and VI oxidation states, to form stable, water-soluble metal ion complexes in moderately alkaline to highly-acidic media. However, the complexing agents can be decomposed, under mild conditions, into non-organic compounds which, for many purposes are environmentally-nondamaging compounds thereby degrading the complex and releasing the metal ion for disposal or recovery. Uses for such complexing agents as well as methods for their manufacture are also described. 1 fig.
- Research Organization:
- University of Chicago
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- Arch Development Corp., Chicago, IL (United States)
- Patent Number(s):
- US 5,678,242/A/
- Application Number:
- PAN: 8-250,001
- OSTI ID:
- 541723
- Country of Publication:
- United States
- Language:
- English
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Extracting metal ions with diphosphonic acid, or derivative thereof
Extracting metal ions with diphosphonic acid, or derivative thereof