Volumetric and acoustic properties of fuel additive oxygenate with hydrocarbons.

Abstract Densities and speed of sound for the binary mixture of diisopropyl ether (DIPE) (1) + toluene, n-octane (2) and toluene (1) + n-hexane, n-heptane, n-octane (2) and n-hexane, n-heptane (1) + n-octane (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 Δ u , excess isentropic compressibility K s E , excess intermolecular free length L f E and excess available volume V a E . For theoretical interpretation of V m E values, Prigogine-Flory-Patterson theory and Graph theory were applied at 298.15 K. Ultrasonic speed data were predicted at 298.15 K using various empirical correlations like Nomoto, Van Dael, Impedance dependence and also by Schaaff's collision factor theory. The temperature effect on K s E and V m E was also discussed. The results were analyzed in the light of unlike interactions, packing effect, cohesion forces and change in orientation order. Highlights • Measured density and ultrasonic speed of mixtures of alkanes, DIPE and toluene. • Excess volume was interpreted in terms of PFP and Graph theory. • Jacobson's free length and Schaaff's collision factor theory were applied. • Available volume and intermolecular free length calculated. • Results were discussed in terms of intermolecular interactions. [ABSTRACT FROM AUTHOR]