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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.
Inventors:
 [1];  [1];  [1]
  1. (Argonne, IL)
Issue Date:
OSTI Identifier:
871190
Assignee:
Arch Development Corporation (Chicago, IL) ANL
Patent Number(s):
US 5678242
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
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/