Ultrasonic and viscometric studies of molecular interactions in binary mixtures of tetrahydrofuran with some aromatic hydrocarbons at temperatures from 288.15 to 318.15 K

Abstract

Ultrasonic speed, u, and viscosity, η, of pure tetrahydrofuran (THF), benzene, toluene, o-xylene, m-xylene, p-xylene, mesitylene and those of their binary mixtures with THF as a common component, over the entire composition range expressed by mole fraction, x 1 of THF (0 ≤ x 1 ≤ 1), were measured at temperatures 288.15, 298.15, 308.15 and 318.15 K. From the experimental data, the deviations in isentropic compressibility, Δk s, in ultrasonic speed, Δu, and in viscosity, Δη were calculated. The partial molar compressibilities, and of THF and aromatic hydrocarbons in the mixtures over the whole composition range and and at infinite dilution and excess partial molar compressibilities, and , over the whole composition range and and at infinite dilution were calculated by using two different approaches. The variation of these parameters with composition and temperature of the mixtures are discussed in terms of molecular interaction in these mixtures. It is observed that the THF-aromatic hydrocarbon interaction in these mixtures follows the order: benzene > toluene > p-xylene > m-xylene > o-xylene > mesitylene. The effect of the number and position of the methyl groups in these aromatic hydrocarbons on the molecular interactions in these mixtures is also discussed.