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In this work we present experimental values of the density, refractive index, and speed of sound of the binary mixtures methanol or ethanol plus hexane, heptane, and octane at the temperatures 303.15, 308.15, 313.15, and 318.15 K and at atmospheric pressure, as a function of mole fraction. The experimental results have been fitted as a funtion of composition. A comparison with other experimental data in the literature has been made.

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In this work we analyze the temperature dependence of the speed of sound, density, and refractive index of binary mixtures of acetone, methanol, and linear aliphatic alkanes (hexane, heptane, or octane) at atmospheric pressure. From the experimental measurements of these physical properties, the corresponding excess molar volumes, isentropic compressibility deviations, and refractive index deviations were derived. A set of variable-degree polynomials have been fitted to the results. Despite the large excess molar volumes obtained, they were satisfactorily correlated by a cubic equation of state with simple combinatorial mixing rules.

Liquid-liquid equilibria for methanol + n-alkanes (C 9 to C 12 ) were determined in the temperature range (278.15 to 308.15 K), using a visual static method. Densities, refractive indices, and speeds of sound were also measured at 288.15, 298.15, and 308.15 K for acetone + n-alkane mixtures and at 298.15 and 308.15 K for methanol + n-alkane mixtures to study the temperature influence on mixing phenomena. The results were used to model liquid-liquid coexistence and derived properties trend. The calculated values based on the UNIQUAC equation were found to be similar to those based on the NRTL model. The Prigogine-Flory-Paterson theory was applied to estimate the excess molar volumes and the UNIFAC group contribution model for phase equilibria.

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