Extracting metal ions with diphosphonic acid, or derivative thereof

Patent · 26 July 1994

OSTI ID:7244712

Horwitz, E P; Gatrone, R C; Nash, K L

Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulfur 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.

• DOE Contract Number: W-31109-ENG-38
• Assignee: Arch Development Corp., Chicago, IL (United States)
• Patent Number(s): A; US 5332531
• Application Number: PPN: US 7-898386
• OSTI ID: 7244712
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
CHEMICAL REACTIONS
ELEMENTS
MANAGEMENT
MATERIALS RECOVERY
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHONIC ACIDS
PROCESSING
SYNTHESIS
TECHNOLOGY ASSESSMENT
WASTE MANAGEMENT
WASTE PROCESSING