Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The speeds of sound, u and viscosities, g of the binary mixtures of 1,4-dioxane with benzene, toluene, o-xylene, m-xylene, p-xylene, and mesitylene over the entire composition, including those of pure liquids, were measured at temperatures (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K and at atmospheric pressure. From the experimental data, the excess isentropic compressibility, jEs , excess speed of sound, uE, excess molar isentropic compressibility, KEs ;m and deviations in viscosity, Dg have been calculated. The partial molar isentropic compressibilities, Ks;m;1 and Ks;m;2, and excess partial molar isentropic compressibilities, KEs ;m;1 and KEs ;m;2 over the whole composition range, partial molar isentropic compressibilities, K s;m;1 and K s;m;2, and excess partial molar isentropic compressibilities, K E s;m;1 and K E s;m;2 of the components at infinite dilution have also been calculated. The results indicated the presence of weak interactions between 1,4-dioxane and aromatic hydrocarbon molecules, which follows the order: benzene greater than toluene greater than o-xylene greater than m-xylene greater than p-xylene greater than mesitylene. It is observed that the interactions depend on the number and position of the methyl groups in these aromatic hydrocarbons. Further, the viscosities of these binary mixtures were correlated theoretically by using various empirical and semiempirical models and the results were compared with the experimental findings.