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Phase diagram of the liquid ternary system hexane-dimethylformamide-solvate of thorium(IV) nitrate with tri-n-butyl phosphate at various temperatures

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Abstract

The phase diagram of the ternary liquid system hexane-dimethylformamide-[Th(NO3)4(TBP)2] was studied at various temperatures. The system consists of two pairs of partially miscible liquids: hexane-dimethylformamide and [Th(NO3)4(TBP)2]-hexane. The area of separation into two liquid phases in the system [Th(NO3)4(TBP)2]-hexane is narrowed with heating; the upper critical temperature T cr is 337.85±0.25 K. The influence of temperature on the area of separation into layers of the system hexane-dimethylformamide is insignificant. The ternary liquid system is characterized by two homogeneous and one two-phase area of liquid solutions at T < 338 K. One of the phases contains variable amounts of [Th(NO3)4(TBP)2] and hexane, and also small amounts of dimethylformamide; the other phase contains variable amounts of dimethylformamide and [Th(NO3)4(TBP)2] and also small amounts of hexane. With increasing temperature, the two-phase area is narrowed and deformed and the homogeneous areas are extended. At T > 338 K, the system transforms into a ternary liquid system with one pair of partially miscible liquids (hexane-dimethylformamide).

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References

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Authors and Affiliations

  1. St. Petersburg State Institute of Technology (Technical University), St. Petersburg, Russia

    A. K. Pyartman, V. A. Keskinov & N. A. Charykov

Authors
  1. A. K. Pyartman
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  2. V. A. Keskinov
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  3. N. A. Charykov
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Original Russian Text © A.K. Pyartman, V.A. Keskinov, N.A. Charykov, 2008, published in Radiokhimiya, 2008, Vol. 50, No. 4, pp. 330–332.

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Pyartman, A.K., Keskinov, V.A. & Charykov, N.A. Phase diagram of the liquid ternary system hexane-dimethylformamide-solvate of thorium(IV) nitrate with tri-n-butyl phosphate at various temperatures. Radiochemistry 50, 378–380 (2008). https://doi.org/10.1134/S1066362208040085

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  • DOI: https://doi.org/10.1134/S1066362208040085

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