Solvent extraction of neptunium by n-octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide from nitric acid solution containing hydrogen peroxide
- Univ. of Tokyo (Japan)
Solvent extraction of Np with n-octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) from HNO[sub 3] solution containing H[sub 2]O[sub 2] was studied from the aspect of extraction rate. Neptunium initially in the pentavalent oxidation state can be extracted by CMPO even without the addition any redox agents, but the distribution is rather low. The H[sub 2]O[sub 2] was found to enhance the distribution ratio. The extraction rate was almost proportional to the 1.5-power of H[sub 2]O[sub 2] concentration. The dependence of the extraction rate on HNO[sub 3] concentration was also examined. Reduction of Np(V) with H[sub 2]O[sub 2] occurs rapidly in the presence of CMPO. The extraction rate is not strongly affected by the presence of tri-n-butylphosphate in the organic phase. As a diluent, decalin gives a greater extraction rate than n-dodecane. 17 refs., 9 figs.
- OSTI ID:
- 5600596
- Journal Information:
- Solvent Extraction and Ion Exchange; (United States), Journal Name: Solvent Extraction and Ion Exchange; (United States) Vol. 11:4; ISSN 0736-6299; ISSN SEIEDB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400105 -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
400703* -- Radiochemistry & Nuclear Chemistry-- Radioisotope Production
ACTINIDE COMPOUNDS
DISPERSIONS
EXTRACTION
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
MANAGEMENT
MIXTURES
NEPTUNIUM COMPOUNDS
NITRIC ACID
OXYGEN COMPOUNDS
PEROXIDES
PHOSPHINE OXIDES
PHOSPHINES
PHOSPHORUS COMPOUNDS
PROCESSING
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
TRANSURANIUM COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING