Phase Separation in the Ternary Liquid System [Nd(NO3)3(TBP)3]-[UO2(NO3)2(TBP)2]-Tetradecane at Different Temperatures

Author： Pyartman A.   Keskinov V.   Mishina N.   Kudrova A.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1066-3622

Source： Radiochemistry, Vol.47, Iss.2, 2005-03, pp. : 173-176

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Abstract

Phase diagram of the ternary liquid system [Nd(NO3)3(TBP)3]-[UO2(NO3)2(TBP)2]-tetradecane at 288.15–345.15 K is studied. There are homogeneous and two-phase regions in the diagram. One of the phases (I) is enriched with [Nd(NO3)3(TBP)3] and [UO2(NO3)2(TBP)2], and the second phase (II), with tetradecane. The two-phase region decreases with increasing temperature. The upper critical temperature of solution (mixing) of the binary and ternary systems is T cr = 344.85±0.5 K. The critical compositions of the ternary liquid system depend on the temperature. The two-phase systems demonstrate preferential concentration of [UO2(NO3)2(TBP)2] in phase I, despite the fact that the binary system [UO2(NO3)2(TBP)2]-tetradecane is homogeneous over the entire temperature range studied.

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