Thermodynamic and acoustic properties of binary mixtures of diisopropyl ether, benzene and alkanes at 298.15, 308.15 and 318.15 K: Prigogine-Flory-Patterson theory and graph theory

Densities and speed of sound for the binary mixtures of diisopropyl ether (1) + n-hexane, n-heptane, benzene (2) and benzene (1) + n-hexane, n-heptane, n-octane (2) and n-hexane (1) + n-heptane (2) were measured from 298.15 K to 318.15 K. The measured data were used to calculate excess molar volume V-m(E), deviation in ultrasonic speed Delta u, isentropic compressibility K-s(E), excess intermolecular free length LfE and excess available volume V-a(E). All the derived properties were fitted to Redlich-Kister equation. For theoretical interpretation of V-m(E) values, Prigogine-Flory-Patterson theory and Graph theory were used at 298.15 K. Various empirical correlations like Nomoto, Van-Dael and impedance dependence relation were applied to predict the experimental ultrasonic speed data. Schaaff's collision factor theory was used for prediction of experimental ultrasonic speed data at 298.15 K. The excess intermolecular length (LfE) was calculated from Jacobson free length theory at 298.15 K. The effect of temperature for K-s(E) and V-m(E) was also discussed in terms of intermolecular interactions. (C) 2018 Elsevier B.V. All rights reserved.