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The thermodynamics of extraction equilibria

III. The uranyl chloride—hydrochloric acid—Di-2-ethylhexyl phosphoric acid—Toluene system

Journal of Radioanalytical and Nuclear Chemistry
Authors: A. Ruvarac, Z. Maksimović, and R. Halaši


A simple graphical method for determination of thermodynamic equilibrium constants, developed for ion-exchange and solvent extraction processes, was successfully applied to a liquid exchangersystem. Close values of the thermodynamic equilibrium constants for the system uranyl chloride—hydrochloric acid—di-2-ethylhyxyl phosphoric acid—toluene (K=7.8±0.8) were obtained when the ionic strength of the aqueous phase was varied and the concentration of di-2-ethylhexyl phosphoric acid in the organic phase was kept constant, and vice versa.

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Solvent extraction of 3,5-dinitrosalicylic (3,5-DNS) and 2-oxy-5-nitropyridinic (2-O-5-N-Py) acids and their Ni(II), Co(II) and Cu(II) complexes from sulphuric acid medium with TBP and TOPO in n-hexane was investigated. The compositions of the extractable species were determined by slope analysis. Possible utilization in separation processes is discussed in general.

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Cereal Research Communications
Authors: M. Barkóczi, P. Szakál, R. Schmidt, R. Kalocsai, Zs. Giczi, and T. Halasi
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