Solubility Thermodynamics of CyMe-BTBP in Various Diluents Mixed with TBP
Journal article, 2018

The two organic ligands 6,6'-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo[1,2,4]triazin-3-yl)[2,2']bipyridine (CyMe-BTBP) and tri-butyl phosphate (TBP) have previously been investigated in different diluents for use within recycling of used nuclear fuel through solvent extraction. The thermodynamic parameters, , , and , of the CyMe-BTBP solubility in three diluents (cyclohexanone, octanol and phenyl trifluoromethyl sulfone) mixed with TBP have been studied at 288, 298 and 308 K, both as pristine solutions and pre-equilibrated with 4 molL nitric acid. In addition, the amount of acid in the organic phase and density change after pre-equilibration have been measured. The solubility of CyMe-BTBP increases with an increased temperature in all systems, especially after acid pre-equilibration. This increased CyMe-BTBP solubility after pre-equilibration could be explained by acid dissolution into the solvent. Comparing the and calculated using with the same parameters derived from a linear fit indicates temperature independence of all three thermodynamic systems. The change in enthalpy is positive in all solutions.

Used nuclear fuel

Solubility thermodynamics

CyMe4-BTBP solubility

Solvent extraction

GANEX process

Author

Jenny Halleröd

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Christian Ekberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Ivan Kajan

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Emma Aneheim

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Journal of Solution Chemistry

0095-9782 (ISSN) 1572-8927 (eISSN)

Vol. 47 6 1021-1036

Safety of ACtinide Separation proceSSes (SACSESS)

European Commission (FP7), 2013-03-01 -- 2016-02-29.

Subject Categories

Inorganic Chemistry

Physical Chemistry

Analytical Chemistry

DOI

10.1007/s10953-018-0774-4

More information

Latest update

9/19/2018