Measurement and Prediction of Excess Enthalpies for Ternary Solutions 1-Ethyl-3-methylimidazolium Dimethylphosphate + Methanol or Ethanol + Water at 298.15 K and at Normal Atmospheric Pressure

The excess enthalpies of binary and ternary solutions composed of ionic liquid, 1-ethyl-3-methylimidazolium dimethylphosphate [Emim][DMP], water, and methanol (or ethanol) were measured with an adiabatic calorimeter at 298.15 K and under normal atmospheric pressure. The experimental data for three sets of binary solution [Emim] [DMP] (1) + H2O(2)/CH3OH(2)/C2H5OH(2) were correlated with the Gibbs–Helmholtz, the nonrandom two liquid (NRTL), and the universal quasi-chemical (UNIQUAC) equations. The binary interaction parameters in the NRTL and UNIQUAC models were obtained and used to predict excess enthalpies of ternary solutions [Emim] [DMP](1) + CH3OH(2) or C2H5OH(2) + H2O(3). The results show that the excess enthalpies of ternary solutions are negative across the whole range of concentrations, which indicates that the [Emim] [DMP] mixed with H2O, CH3OH, or C2H5OH is exothermic. Meanwhile, the average relative deviations (ARD) between the experimental and correlated excess enthalpies for the three sets of ...