Solvation in the extraction of lanthanoid and actinoid nitrates by tri-n-butylphosphate
The extraction systems water-lanthanoid or actinide nitrate-tri-n butylphosphate are among those most studied. It was originally suggested that disolvates are formed when uranyl or thorium nitrates are extracted, whereas trisolvates are formed in the extraction of the lanthanoid nitrates. However, taking the formation of only these compounds into account does not enable the extraction equilibrium to be represented in some of the systems studied. The electrolytic dissociation of salts in the tri-n-butylphosphate phase is small. Their distribution is accompanied by the displacement of water from the organic phase. Therefore the extraction reaction can be written in the form: M/sup n+/ + nNO/sup -//sub 3/ + qS ..-->..reverse arrow M(NO/sub 3/)/sub n/S/sub q/ with the constant: K/sub q/ = m/(am/sup q//sub S/), where S is the extractant, q is the solvate number, a is the activity of a salt in a binary aqueous solution, and m is the molar concentration of the sale in the organic phase.
- Research Organization:
- D. I. Mendeleev Moscow Chemical Tech. Inst., USSR
- OSTI ID:
- 6900137
- Journal Information:
- Dokl. Phys. Chem. (Engl. Transl.); (United States), Journal Name: Dokl. Phys. Chem. (Engl. Transl.); (United States) Vol. 258:1-3; ISSN DKPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
ACTINIDES
BUTYL PHOSPHATES
CONCENTRATION RATIO
DATA
DIAGRAMS
ELEMENTS
EQUATIONS
ESTERS
EXPERIMENTAL DATA
EXTRACTION
HYDROGEN COMPOUNDS
INFORMATION
MEDIUM TEMPERATURE
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
RARE EARTHS
SALTING-OUT AGENTS
SCATTERPLOTS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SOLVENTS
TBP
WATER