Density (F), viscosity (η), and refractive index (n D ) data of the binary mixtures of anisole + benzene, + methylbenzene, + ethylbenzene, + propylbenzene, and + butylbenzene were measured over the whole composition range at (293.15 and 303.15) K and atmospheric pressure. The viscosity data were correlated by empirical and semiempirical equations. The refractive index data were compared with calculated values using different models based on mixing rules. The excess molar volumes (V E ) and viscosity deviations (∆η) were derived from the measurements. The V E and ∆η of binary mixtures were fitted to Redlich-Kister polynomial equation. The excess and deviation functions are negative and decrease with increasing side chain length of the parent benzene molecule in the following order: benzene > methylbenzene > ethylbenzene > propylbenzene > butylbenzene.

The viscosities, densities, and speeds of sound of binary mixtures of anisole with benzene, toluene, o-xylene, m-xylene, p-xylene, and mesitylene over the entire range of mole fraction at temperatures (288.15, 293.15, 298.15, and 303.15) K and atmospheric pressure have been measured. Excess compressibility and deviations in viscosity have been calculated and fitted to the Redlich-Kister polynomial relation to estimate the binary coefficients and standard errors. The deviations in viscosities and excess compressibilities are negative for all binary systems. The speeds of sound have been analyzed in terms of collision factor theory and free length theory. The viscosity data were correlated with equations of Grunberg and Nissan, Tamura and Kurata, Heric and Brewer, and McAllister.

The liquid-liquid equilibrium (LLE) for the system water + ethanol + ethyl tert-butyl ether (ETBE) has been studied in the temperature range of (288.15 to 308.15) K. The NRTL equation and UNIQUAC method were used to regress the experimental data. The UNIFAC method was used to predict the phase equilibrium in the system using the interaction parameters determined from experimental data between groups CH 2 , CH 2 O, OH, and H 2 O. The UNIQUAC and NRTL equations fit the experimental data with a root mean square deviation of 0.36% for each, while the UNIFAC method predicted the results with a root mean square deviation of 0.65%.

The liquid-liquid equilibrium for the system water + ethanol + reformate was studied over the temperatures of (288.15, 298.15, 308.15, and 318.15) K. A typical reformate containing 5 mass % cyclohexane, 35 mass % isooctane, and 60 mass % xylene was used in this study. The results of this study showed that the addition of ethanol to a reformate + water mixture results in an increased water solubility in the organic phase. Raising the temperature will increase the solubility of ethanol in the organic phase and decrease the solubility of ethanol in the aqueous phase. The experimental data have been correlated using UNIQUAC and NRTL equations with average RMSDs of 0.168 and 0.287, respectively. The experimental results were used to estimate the interaction parameters between water, ethanol, and reformate for the UNIQUAC and NRTL equations as a function of temperature.