Homogeneous liquid-liquid extraction of metal cations at near neutral pH
Solvent extraction performed at low pH to prevent hydrolysis of cations has been studied in conjunction with homogeneous liquid-liquid solvent extraction into propylene carbonate, which forms a homogeneous solution with an aqueous phase when heated above 71/sup 0/C. Extraction is achieved with heating and cooling upon which the phases separate. Also, propylene carbonate yields a homogenous phase with water and ethanol in the ratio, propylene carbonate/water/ethanol 2:2:1; thus permitting direct comparison by e.g., absorption spectrophotometry of aqueous phase, organic phase and calibration standards. Thenoyltrifluoroacetone chelates of Fe(III), Co(II), and Cu(II) have been extracted from an aqueous phase containing tartrate, at pH values from 6 to 8, into propylene carbonate by the homogeneous liquid-liquid extraction technique. The extractions were very rapid, and quantitative under optimum conditions. Iron(III) was also quantitatively and rapidly extracted with acetylacetone under these same conditions. Normal extraction technique into propylene carbonate and toluene also gave rapid and quantitative results for Fe(III)-TTA from this aqueous medium. These results, attributed to the significantly higher ratio of enolate ion, suggest an alternative mechanism for the synergic effect of various organic gases in TTA extractions. Acid-base reactions in the organic phase yield similar higher concentrations of enolate ion in the aqueous phase. A method was developed to extract uranium from ores and fuel elements using homogeneous liquid-liquid solvent extraction.
- Research Organization:
- City Univ. of New York, NY (USA)
- OSTI ID:
- 7252406
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ACETYLACETONE
ACTINIDE COMPLEXES
CARBON COMPOUNDS
CARBONATES
CHELATING AGENTS
COBALT COMPLEXES
COMPLEXES
COPPER COMPLEXES
EXTRACTION
FUEL ELEMENTS
HETEROCYCLIC COMPOUNDS
IRON COMPLEXES
KETONES
ORES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PROCESSING
REACTOR COMPONENTS
REAGENTS
REPROCESSING
SEPARATION PROCESSES
SOLVENT EXTRACTION
SPENT FUEL ELEMENTS
TRANSITION ELEMENT COMPLEXES
TTA
URANIUM COMPLEXES
URANIUM ORES