Physicochemical study of intermolecular interactions in 1,4-dioxane + aromatic hydrocarbons binary mixtures at different temperatures by using ultrasonic and viscometric methods

Abstract

The speeds of sound, u and viscosities, η 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, κsE, excess speed of sound, uE, excess molar isentropic compressibility, Ks,mE and deviations in viscosity, Δη have been calculated. The partial molar isentropic compressibilities, K‾s,m,1 and K‾s,m,2, and excess partial molar isentropic compressibilities, K‾s,m,1E and K‾s,m,2E 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‾s,m,1∘E and K‾s,m,2∘E 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>toluene>o-xylene>m-xylene>p-xylene>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 semi-empirical models and the results were compared with the experimental findings.