Selected alkyl(phenyl)-N,N-dialkylcarbamoylmethylphosphine oxides as extractants for Am(III) from nitric acid media
A new series of neutral bifunctional extractants, alkyl(phenyl)-N,N-dialkyl-carbamoylmethylphosphine oxides, has been prepared and studied as extractants for Am(III) from nitric acid media. Two types of alkyl(phenyl)-N,N-dialkyl CMPO compounds were prepared, one containing N,N-diethyl groups and the other containing N,N-diisobutyl groups. The N,N-diethyl series contained hexyl(phenyl) and 6-methylheptyl(phenyl) derivatives, abbreviated H phi DECMPO and 6-MH phi DECMPO, respectively. The N,N-diisobutyl series contained the n-octyl(phenyl), 6-methylheptyl(phenyl), and the 2-ethylhexyl(phenyl) derivatives, abbreviated O phi D(IB)CMPO, 6-MH phi D(IB)CMPO, and 2-EH phi D(IB)CMPO, respectively. Third power extractant dependencies for the extraction of Am(III) from 0.5 and 3 M HNO/sub 3/ were obtained at low (< 0.25 M) concentrations of extractant, but higher power dependencies were obtained above 0.25 M extractant from 3 M HNO/sub 3/. The H phi DECMPO, 6-MH phi DECMPO, 6-MH phi D(IB)CMPO, and O phi D(IB)CMPO (all 0.5 M in diethylbenzene (DEB)) are significantly better extractants than DHDECMPO for Am(III) from 1 to 6 M HNO/sub 3/. These same extractants have lower D/sub Am/ values than DHDECMPO at low acidities. H phi DECMPO and O phi D(IB)CMPO also have better selectivity for Am(III) over Fe(III) than DHDECMPO. H phi DECMPO in DEB has a strong tendency toward the formation of a second liquid organic phase on extracting macroconcentrations of Nd(III) and U(VI) from 3 M HNO/sub 3/; however, this behavior is substantially diminished with the O phi D(IB)CMPO and 6-MH phi D(IB)CMPO compounds.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6235767
- Journal Information:
- Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 17:10; ISSN SSTED
- 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
ACTINIDE COMPLEXES
ACTINIDES
AMERICIUM
AMERICIUM COMPLEXES
COMPARATIVE EVALUATIONS
COMPLEXES
DATA
ELEMENTS
ESTERS
EXPERIMENTAL DATA
EXTRACTION
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
METALS
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC SOLVENTS
PHOSPHINIC ACID ESTERS
PHOSPHONIC ACID ESTERS
QUANTITY RATIO
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
SPECIFICITY
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM COMPLEXES
TRANSURANIUM ELEMENTS