Halleröd J, Ekberg C, Kajan I, Aneheim E. Solubility Thermodynamics of CyMe
4 -BTBP in Various Diluents Mixed with TBP.
J SOLUTION CHEM 2018;
47:1021-1036. [PMID:
30046200 PMCID:
PMC6028903 DOI:
10.1007/s10953-018-0774-4]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/14/2018] [Indexed: 11/26/2022]
Abstract
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\documentclass[12pt]{minimal}
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\begin{document}$$_{4}$$\end{document}4-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, \documentclass[12pt]{minimal}
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\begin{document}$$K_{\mathrm{S}}$$\end{document}KS, \documentclass[12pt]{minimal}
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\begin{document}$$\Delta C_{p}$$\end{document}ΔCp, \documentclass[12pt]{minimal}
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\begin{document}$$\Delta H^{0}$$\end{document}ΔH0 and \documentclass[12pt]{minimal}
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\begin{document}$$\Delta S^{0}$$\end{document}ΔS0, of the CyMe\documentclass[12pt]{minimal}
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\begin{document}$$_{4}$$\end{document}4-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 mol\documentclass[12pt]{minimal}
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\begin{document}$$\cdot $$\end{document}·L\documentclass[12pt]{minimal}
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\begin{document}$$^{-1}$$\end{document}-1 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\documentclass[12pt]{minimal}
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\begin{document}$$_{4}$$\end{document}4-BTBP increases with an increased temperature in all systems, especially after acid pre-equilibration. This increased CyMe\documentclass[12pt]{minimal}
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\begin{document}$$_{4}$$\end{document}4-BTBP solubility after pre-equilibration could be explained by acid dissolution into the solvent. Comparing the \documentclass[12pt]{minimal}
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\begin{document}$$\Delta H^{0}$$\end{document}ΔH0 and \documentclass[12pt]{minimal}
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\begin{document}$$\Delta S^{0}$$\end{document}ΔS0 calculated using \documentclass[12pt]{minimal}
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\begin{document}$$\Delta C_{p}$$\end{document}ΔCp 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.
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