Solvent extraction of heptavalent technetium and rhenium by tributyl phosphate. Consolidated Fuel Reprocessing Program and Basic Energy Sciences Programs

Technical Report · Sat Dec 01 04:00:00 EST 1984

DOI:https://doi.org/10.2172/6271821· OSTI ID:6271821

Pruett, D. J.

The literature pertaining to the solvent extraction of heptavalent technetium and rhenium from aqueous solution by tributyl phosphate (TBP) has been compiled, critically evaluated, and supplemented with new data in some areas. The effects of adding mineral acids, alkali metal nitrates, alkali metal chlorides, uranyl nitrate, thorium nitrate, and plutonium(IV) nitrate to these systems were also examined. Discussions of the possible nature of the organic-phase complexes are presented, along with values of ..delta..G, ..delta..H, ..delta..S, and the equilibrium constant for the extraction reaction in several systems. Mathematical models correlating the distribution behavior over a wide range of conditions were also developed. Equations are given for calculating the distribution coefficients for the extraction of Re(VII) or Tc(VII) from 0.2 to 4 M HCl by 0.339 to 2.90 M TBP at 298 to 333/sup 0/K. Equations are given for calculating the distribution coefficients under the same conditions, but with HNO/sub 3/ (instead of HCl) present in the aqueous phase. 28 references, 27 figures, 3 tables.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6271821
• Report Number(s): ORNL/TM-8668; ON: DE85004948
• Country of Publication: United States
• Language: English

Related Subjects

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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
BUTYL PHOSPHATES
COMPLEXES
DATA
DATA COMPILATION
DISTRIBUTION FUNCTIONS
ELEMENTS
ENERGY
ENTHALPY
ENTROPY
ESTERS
EXPERIMENTAL DATA
EXTRACTION
FREE ENTHALPY
FUNCTIONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
METALS
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORIC ACID ESTERS
PHYSICAL PROPERTIES
RHENIUM
RHENIUM COMPLEXES
SEPARATION PROCESSES
SOLVENT EXTRACTION
TBP
TECHNETIUM
TECHNETIUM COMPLEXES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS