Densities, viscosities, speeds of sound, surface tensions, and refractive indices for nine different imidazolium-, pyroldinium-, and phosphonium-based ionic liquids were measured at temperatures ranging from 298.15 K to 333.15 K and atmospheric pressure. Empirical models were used to correlate the thermophysical properties of the ionic liquids as a function of temperature. The isentropic compressibility, coefficients of thermal expansion, surface properties, and critical temperatures were calculated using the experimental data. Furthermore, the effect of anions and alkyl chains of the different ionic liquids on their thermophysical properties had been investigated.
Isentropic compressibility k s , excess isentropic compressibility k s E , excess molar volume V E , viscosity deviations ∆η, and speed of sound deviations u D for {chlorobenzene + 1-hexanol or 1-heptanol, or 1-octanol, or 1-nonanol, or 1-decanol} binary mixtures at temperatures ranging from (298.15 to 313.15) K and at atmospheric pressure were derived from experimental viscosity η, density F, and speed of sound u data. The calculated excess and deviation functions were further fitted to the polynomial relation to estimate the coefficients and standard errors. While the experimental viscosity data was compared with the predicted values obtained from empirical expressions, the speeds of sound data was analyzed in term of Schaaffs' collision factor theory and Jacobson's intermolecular free length theory of solutions. The effects of n-alkan-1-ol chain length as well as the temperature on the excess molar volume were studied.
A liquid-liquid equilibria for the ternary system, water + acetic acid + 1-heptanol, was studied over a temperature range of (288.15-318.15) K. The results were used to estimate the LLE interaction parameters for LLE between each of the three compounds for the NRTL and the UNIQUAC equations. The UNIFAC group contribution method has been utilized for predicting the interaction parameters between each of the H 2 O, CH 2 , CH 3 , OH, and COOH groups as a function of temperature. The UNIQUAC and NRTL equations fit the experimental data with a root-mean-square deviation (rmsd) of 0.6% for each. The results of our measurements are compared with the prediction of the UNIFAC method with a rmsd of 2.4%.
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