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Excess molar enthalpy (H^E) data and vapor−liquid equilibria (VLE) were measured for the ternary system toluene + ethylbenzene + chlorobenzene. Ternary H^E values were measured with a Calvet-type microcalorimeter at 298.15 K. These results together with literature H^E data of constituent binaries were used for a correlation with the modified Redlich−Kister equation. Boiling temperature (T)−liquid composition (x) relations were obtained at (26.66, 53.33, 79.99, and 101.32) kPa by using a semimicroebulliometer. The modified Wilson model with parameters that linearly depend on temperature was used to correlate the binary T−x data and to predict VLE in the ternary system. Excess functions at 298.15 K were compared.

Isobaric vapor−liquid equilibria (VLE) were measured for the system o-xylene + nonane + cyclohexanol and for two constituent binaries containing cyclohexanol at the pressures 26.66, 53.33, and 79.99 kPa. The new modified Wilson equation is proposed to better describe vapor−liquid equilibria (VLE) in binary and multicomponent systems. The equation takes into account the linear dependence of the difference of interaction energies λij − λii on temperature and avoids the use of molar volumes. Correlation of binary isobaric VLE experimental data gave four coefficients that can describe VLE at different pressures and in a large boiling temperature region. It was found that VLE data for the ternary system o-xylene + nonane + cyclohexanol can be predicted by the modified Wilson equation.

Isobaric vapor−liquid equilibria were measured for the system o-xylene + amyl acetate + nonane and for three constituent binary systems at the pressures 101.32, 79.99, 53.33, and 26.66 kPa. The measurements were made in a semi-microebulliometer. Nonane formed minimum boiling azeotropes with o-xylene and amyl acetate while the binary system o-xylene + amyl acetate was nonazeotropic. The Wilson model was used to correlate the binary boiling temperature (T)−composition (x) data. The T−x data of the ternary system were found to be well predicted by the Wilson model, giving significantly better results than the UNIFAC method.

Excess enthalpies (H^E) were determined for two ternary systems, 1,3-butanediol + cyclohexanol + decane and 1,2-propanediol + 1,3-butanediol + cyclohexanol, and for their five constituent binaries at 318.15 K with a Calvet-type microcalorimeter. The ternary liquid−liquid coexistence curve for the first ternary system was measured at 318.15 K by the titration method. From the experimental results for binary systems, parameters of the Redlich−Kister equation were obtained and used to predict the ternary H^E results.

Excess enthalpies (H^E) were determined for two ternary systems, o-xylene + cyclohexanol + nonane and 3-methylphenol + 1-hexanol + heptane, and for their constituent binaries at 298.15 K and for the first ternary system also at 318.15 K. The ternary H^E as a function of the composition was described by a new modification of the Redlich− Kister equation and presented in the form of isoenthalpic (H^E = const) curves.

Isobaric vapor−liquid equilibria (VLE) were measured for the ternary system methylbutyl ketone + nonane + cyclohexanol and for the binary methylbutyl ketone + cyclohexanol. Boiling temperature (T)−liquid composition (x) relations were obtained at (26.66, 53.33, and 79.99) kPa by using a semi-microebulliometer. The modified Wilson model was used to correlate the binary T−x data and to predict VLE in the ternary system.

Isobaric vapor−liquid equilibria (VLE) was measured for the ternary system toluene + ethylbenzene + amyl acetate. Boiling temperature (T) − liquid composition (x) relations were obtained at (26.66, 53.33, and 79.99) kPa by using a semimicroebulliometer. The Wilson model was used to correlate the binary T−x data and to predict VLE in the ternary system.

Excess molar enthalpies (H^E) at 318.15 K are reported for two ternary systems, o-xylene + cyclohexanol + phenol and o-xylene + cyclohexanol + 1,3-butanediol, and for two constituent binaries formed by o-xylene with phenol and 1,3-butanediol. The ternary system containing phenol exhibits regions of both exothermic and endothermic mixing, H^E for the other ternary system are endothermic. Owing to partial miscibility in the o-xylene + 1,3-butanediol system, the ternary system containing 1,3-butanediol includes a region with two coexisting liquid phases. A modified Redlich−Kister equation fitted to experimental results provides a satisfactory mathematical representation of H^E data for the o-xylene + cyclohexanol + 1,3-butanediol system.