1H NMR and acoustic response of binary mixtures of an organophosphorous extractant with 1-alkanols (C1-C4, C8)

Density, ultrasonic velocity and viscosity of an organophosphorous extractant, i.e. di(2-ethylhexyl) phosphoric acid (D2EHPA) and its binary mixtures with five alkanols (C1-C4, C8) viz., methanol, ethanol, 1-propanol, 1-butanol and 1-octanol have been measured at 303.15 K and atmospheric pressure. Using these experimental values, excess molar volume, excess Gibbs energy of activation of viscous flow, deviations in ultrasonic velocity, viscosity, isentropic compressibility, intermolecular free length and acoustic impedance have been computed over the entire mole fraction range of D2EHPA. These excess/deviation functions were fitted to Redlich-Kister type of polynomial equation to derive binary coefficients and estimate standard errors between the experimental and calculated data. The variations of excess/deviation functions with composition of D2EHPA have been discussed in terms of molecular interaction in the mixtures. Furthermore, 1H NMR spectra of these binary mixtures at a constant volume have been reported and correlated with acoustic responses.