Volumetric, ultrasonic, viscometric and refractive index behavior of binary mixtures of 2,2,4-trimethylpentane with aromatic hydrocarbons: An experimental and theoretical study

摘要

Measurements of densities, rho, ultrasonic speeds, u, viscosities, eta, and refractive indices, n have been carried out for binary mixtures of 2,2,4-trimethylpentane (TMP) with benzene, toluene, o-xylene, m-xylene, and p-xylene, including those of pure liquids, at 35 degrees C over the entire composition range. From these experimental data, the values of excess molar volumes, V-E, deviations in isentropic compressibilities, Delta k(s), and viscosities, Delta eta, excess Gibbs free energy of activation of viscous flow, G(*E), deviations in refractive indices, Delta n, and partial molar isentropic compressibility, (K) over bar (2)o, of aromatic hydrocarbons in TMP at infinite dilution were calculated. The variations of these parameters with composition of the mixtures suggest an increasingly better packing of plate-like aromatic molecules into the spaces created by globular-shaped TMP molecules in the sequence: benzene