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Solvent extraction of heptavalent technetium by tributyl phosphate

Conference · · Sep. Sci. Technol.; (United States)
OSTI ID:5680442
The solvent extraction of heptavalent technetium from aqueous nitric or hydrochloric acid by tributyl phosphate in n-dodecane (TBP-NDD) has been studied over a wide range of TBP and acid concentrations at 25, 50, and 60/sup 0/C. The extraction was found to proceed according to the reaction 3TBP + H/sup +/ + TcO/sub 4//sup -/ ..-->.. (HTcO/sub 4/ 3TBP). A discussion of possible reaction mechanisms is presented, along with values for ..delta..G, ..delta..H, ..delta..S, and the equilibrium constant for the extraction reaction. Finally, evidence for the coextraction of technetium by uranyl ions is discussed. 10 figures, 5 tables.
Research Organization:
Oak Ridge National Lab., TN
DOE Contract Number:
W-7405-ENG-26
OSTI ID:
5680442
Report Number(s):
CONF-810520-
Conference Information:
Journal Name: Sep. Sci. Technol.; (United States) Journal Volume: 16:9
Country of Publication:
United States
Language:
English

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ADDUCTS
ALKANES
AQUEOUS SOLUTIONS
BUTYL PHOSPHATES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
COMPLEXES
DATA
DISPERSIONS
DODECANE
ELEMENTS
ENTHALPY
ENTROPY
EQUILIBRIUM
ESTERS
EXPERIMENTAL DATA
EXTRACTION
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
MEDIUM TEMPERATURE
METALS
MIXTURES
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC SOLVENTS
PHOSPHORIC ACID ESTERS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
REACTION KINETICS
REFRACTORY METALS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
TBP
TECHNETIUM
TECHNETIUM COMPLEXES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS