Volumetric, acoustic and optical studies of ternary mixture of diisopropyl ether, n-heptane and n-octane

Abstract

Abstract Density, ultrasonic speed and refractive indices of the ternary liquid mixture of diisopropyl ether (DIPE), n-heptane and n-octane were experimentally determined at 298.15 K to 318.15 K. Excess molar volume (VmE), deviation in speed of sound (Δu), excess isentropic compressibility (KSE), excess intermolecular free length (LfE) and deviation in refractive index (Δn) of ternary mixtures were derived from experimental data. The VmE values were fitted to the Singh, Cibulka and Nagata equations and the same have also been interpreted using Prigogine-Flory-Patterson theory. Various geometrical solution models like Tsao-Smith model, Jacob-Fitzner model, Kohler model, Rastogi model and Radojkovic model were used to predict VmE for the ternary mixtures using their binary excess volume data. Various correlations like Nomato, van Dael, impedance dependence relations and CFT theory were used to correlate speed of sound data at 298.15 K. LfE and VaE were also calculated from Jacobson free length theory at 298.15 K. The Δu, KSE, LfE, VaE and Δn values were also fitted to the Singh equation. Various mixing rules Arago-Biot, Gladstone-Dale, Weiner, Heller, Newton, Eyring and John were used for theoretical prediction of refractive indices of the ternary mixture. Temperature effects on various properties were also studied.