, Volume 50, Issue 4, pp 378-380

First online:

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

  • A. K. PyartmanAffiliated withSt. Petersburg State Institute of Technology (Technical University)
  • , V. A. KeskinovAffiliated withSt. Petersburg State Institute of Technology (Technical University)
  • , N. A. CharykovAffiliated withSt. Petersburg State Institute of Technology (Technical University)

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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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