Phase diagrams for the [Th(NO3)4(TBP)2]-decane-[UO2(NO3)2(TBP)2] liquid ternary system |
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| Authors: | A. K. Pyartman V. A. Keskinov N. A. Charykov |
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| Affiliation: | (1) St. Petersburg State Technological Institute (Technical University), Moskovskii pr. 26, St. Petersburg, 198013, Russia |
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| Abstract: | We report a phase diagram (on the mole fraction scale) for the [Th(NO3)4(TBP)2]-decane-[UO2(NO3)2(TBP)2](1-2-3) ternary liquid system, where TBP stands for tributyl phosphate, at T = 298.15 K. This system is characterized by a homogeneous solution field and a two-liquid field (immiscibility field); one phase (phase I) is enriched in [Th(NO3)4(TBP)2] and [UO2(NO3)2(TBP)2], and the other (phase II) is enriched in decane. Molecular interaction parameters and excess Gibbs energies G ex were calculated for the binary systems and the ternary liquid system along the binodal curve proceeding from miscibility in the [Th(NO3)4(TBP)2]-decane system and the ternary system and using equations of the NTRL model. For the ternary system, G ex > 0. G ex decreases in the following order of pairs of liquids: (1, 2) > (2, 3) > (1, 3). |
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