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Membrane extraction with thermodynamically unstable diphosphonic acid derivatives

United States Patent

*** EXPIRED ***
October 14, 1997
View the Complete Patent at the US Patent & Trademark Office
Argonne National Laboratory - Visit the Technology Development and Commercialization Website
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.
Horwitz; Earl Philip (Argonne, IL), Gatrone; Ralph Carl (Argonne, IL), Nash; Kenneth LaVerne (Argonne, IL)
Arch Development Corporation (Chicago, IL)
08/ 250,001
July 7, 1994
The U.S. Government has rights in this invention pursuant to Contract No. W-31-109-ENG-38 between the U.S. Department of Energy and University of Chicago as operator of Argonne National Laboratory.