Phase diagram for the hexane-[Y(NO3)3(TBP)3]-acetonitrile liquid ternary

Abstract

A phase diagram for the hexane-[Y(NO3)3(TBP)3]-acetonitrile (1-2-3) liquid ternary at T = 298.15 K was studied. This ternary consists of two pairs of incompletely miscible liquids (hexane-acetonitrile and [Y(NO3)3(TBP)3]-hexane). It contains two homogeneous liquid fields and one two-phase liquid field. One phase is depleted of acetonitrile and contains variable proportions of [Y(NO3)3(TBP)3] and hexane; the other contains variable proportions of acetonitrile and [Y(NO3)3(TBP)3] and small proportions of hexane. Intermolecular interaction parameters and excess Gibbs energies g E were calculated for binaries and the liquid ternary along binodal curves proceeding from miscibility data for the [Y(NO3)3(TBP)3]-hexane and hexane-acetonitrile binaries and the liquid ternary and using equations of the NTRL model. For the liquid ternary, g E > 0.g E decreases in the following order of pairs of liquids: (1, 3), (1, 2), (2, 3). A computer algorithm is given for calculating binodal curves and tie-lines for the liquid ternary with the use of equations of the NTRL model proceeding from the intermolecular interaction parameters.