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A B S T R A C TThe ultrasonic velocity, density and viscosity of an acidic nuclear extractant namely di (2-ethylhexyl) phosphoric acid (D2EHPA) and its binary mixtures with three monosubstituted benzenes, viz., nitrobenzene, chlorobenzene and toluene were determined at temperature T = 303.15 K and at pressure p = 0.1MPa. The experimental values were utilized to compute relaxation time, excess molar volume, excess Gibbs energy of activation of viscous flow, deviations in intermolecular free length, acoustic impedance, ultrasonic velocity and viscosity. The excess / deviation functions were fitted to fourth order Redlich-Kister type polynomial equation to estimate binary coefficients and standard errors between experimental and calculated data. The nature of these functions was utilized to speculate the nature of molecular interaction between component molecules of all studied binary mixtures. Furthermore, 31 P NMR spectra of pure D2EHPA and its binary mixtures with the monosubstituted benzenes were used to assess molecular interactions between components of liquid mixtures at microscopic level and to corroborate with the results obtained from bulk properties of liquid mixtures.

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Dielectric constants of binary mixtures of MIBK, an extractant used in nuclear energy industry, with six apolar solvents i.e. benzene, dioxane, cyclohexane, carbon tetrachloride, p-xylene and n-heptane have been measured at 455 kHz. The data are used to evaluate the Eyring's structural parameter, G*, in these systems to assess the nature of non-specific solute-solvent interaction. The value of G* is found to be influenced by the nature of the solvent.