, Volume 50, Issue 4, pp 378–380 | Cite as

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

  • A. K. Pyartman
  • V. A. Keskinov
  • N. A. Charykov


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 Tcr 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).

PACS numbers



  1. 1.
    Pyartman, A.K., Keskinov, V.A., Lishchuk, V.V., and Spiridonova, I.A., Radiokhimiya, 2006, vol. 48, no. 3, pp. 245–251.Google Scholar
  2. 2.
    Treybal, R.E., Liquid Extraction, New York: McGraw-Hill, 1963.Google Scholar
  3. 3.
    Pyartman, A.K., Keskinov, V.A., Mishina, N.E., and Kudrova, A.V., Radiokhimiya, 2005, vol. 47, no. 5, pp. 443–444.Google Scholar
  4. 4.
    Keskinov, V.A., Mishina, N.E., and Pyartman, A.K., Zh. Neorg. Khim., 2005, vol. 50, no. 11, pp. 1768–1771.Google Scholar

Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • A. K. Pyartman
    • 1
  • V. A. Keskinov
    • 1
  • N. A. Charykov
    • 1
  1. 1.St. Petersburg State Institute of Technology (Technical University)St. PetersburgRussia

Personalised recommendations