Excess Thermodynamic Studies in Binary Mixture of Ethyl Benzoate with Butan-2-Ol at 293.15 K

Abstract

Densities, ρ, viscosities, η, and refractive indices, n_D, of the binary mixture of ethyl benzoate (EB) with 2-butanol (2-BuOH), including those of pure liquids were measured over the entire composition range at T= 293.15 K and under atmospheric pressure. From the experimental data, the excess molar volumes, V^E and the other excess thermodynamic properties such as deviations in viscosity, Δη, refractive index, Δn_D, and excess free energy of activation, ΔG^*E, have been evaluated.  The computed data V^E, Δη, ΔG*^E and Δn_D have been correlated with Redlich-Kister polynomial equation to ascertain the fitting parameters and standard deviations. The V^E and Δn_D values are positive. The Δη and ΔG^*E are found to be negative over the entire range of mole fraction. The changes in positive and negative values of excess properties could explain the different kinds of interactions between the component molecules. These results can be used to develop comprehensive theoretical models for designing various technological processes in the chemical and biochemical industries. A good agreement among experimental data and the values estimated by theoretical procedure was obtained. The deviations for excess properties have been explained on the basis of the intermolecular interactions.