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

Abstract

Abstract Densities and speed of sound for the binary mixtures of diisopropyl ether (1)\u202f+\u202fn‑hexane, n‑heptane, benzene (2) and benzene (1)\u202f+\u202fn‑hexane, n‑heptane, n‑octane (2) and n‑hexane (1)\u202f+\u202fn‑heptane (2) were measured from 298.15\u202fK to 318.15\u202fK. The measured data were used to calculate excess molar volume VmE, deviation in ultrasonic speed Δu, isentropic compressibility KsE, excess intermolecular free length LfE and excess available volume VaE. All the derived properties were fitted to Redlich-Kister equation. For theoretical interpretation of VmE values, Prigogine-Flory-Patterson theory and Graph theory were used at 298.15\u202fK. 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\u202fK. The excess intermolecular length (LfE) was calculated from Jacobson free length theory at 298.15\u202fK. The effect of temperature for KsE and VmE was also discussed in terms of intermolecular interactions.