Dimethylformamide
Neodymium(III) Nitrate tri-n-Butyl Phosphate Solvate Liquid
Ternary System at Various Temperatures
V. A. Keskinov, A. K. Pyartman, and N. A. Charykov
St. Petersburg State Technological Institute (Technical University), Moskovskii pr. 26, St. Petersburg, 198013 Russia
Received June 1, 2007
Abstract—Phase diagrams of the hexane–dimethylformamide–[Nd(NO3)3(TBP)3] ternary liquid system at
various temperatures were studied. The system consists of two pairs of incompletely miscible liquids: hexane–
dimethylformamide (DMF) and [Nd(NO3)3(TBP)3]–hexane. The liquid–liquid phase separation region in the
[Nd(NO3)3(TBP)3]–hexane system narrows with rising temperature; the upper critical solution Tcr = (316.15 ±
0.25) K. Temperature insignificantly influences the immiscibility region in the hexane–DMF system. The ter-
nary liquid system has two homogeneous fields and one two-phase liquid solution field at T < 316 K. One phase
is depleted of DMF and contains variable [Nd(NO3)3(TBP)3] and hexane proportions; the other contains vari-
able DMF and [Nd(NO3)3(TBP)3] proportions and small hexane percentages. The two-phase region narrows
and deforms with rising temperature, whereas the homogeneous regions expand. At T > 337 K, the system trans-
forms to a ternary liquid system with one pair of incompletely miscible liquids (hexane–DMF).
DOI: 10.1134/S0036023608090258
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