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Title: 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];  [1];  [1]
  1. (Argonne, IL)
Issue Date:
OSTI Identifier:
Arch Development Corporation (Chicago, IL) ANL
Patent Number(s):
US 5678242
Contract Number:
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
membrane; extraction; thermodynamically; unstable; diphosphonic; acid; derivatives; thermodynamically-unstable; complexing; agents; acids; sulphur; containing; analogs; carboxyhydroxymethanediphosphonic; vinylidene-1; 1-diphosphonic; capable; metal; especially; ii; iii; oxidation; form; stable; water-soluble; complexes; moderately; alkaline; highly-acidic; media; decomposed; mild; conditions; non-organic; compounds; purposes; environmentally-nondamaging; degrading; complex; releasing; disposal; recovery; methods; manufacture; described; form stable; thermodynamically unstable; water-soluble metal; complexing agents; organic compound; organic compounds; complexing agent; soluble metal; phosphonic acid; diphosphonic acid; mild conditions; sulphur containing; acid derivatives; acid derivative; acidic media; methanediphosphonic acid; thermodynamically-unstable complexing; carboxyhydroxymethanediphosphonic acid; diphosphonic acids; containing analogs; /588/423/