Viscometric and Refractometric Studies on Molecular Interactions in Binary Liquid Mixture containing non-associative component

Abstract

In this study, Density (ρ), viscosity (η), and refractive index (n_D) including those of pure liquids were measured over the entire mole fraction range at 298.15 K, for the binary mixture of ethyl benzoate (EB) and 1-Butanol (1-BuOH). Densities and viscosities were determined using a viscosity meter X sample 530 with SVM 3001 (Anton Paar). Refractive indices were measured with a digital refractometer (RFM 81, Bellingham & Stanley Ltd). From these experimentally data, various thermophysical properties such as excess molar volume, V^E, deviations in viscosity (Δη), refractive index (Δn_D) and excess free energy of activation (ΔG*^E) have been calculated then fitted to the Redlich- Kister polynomial equation. In the chemical and biochemical industries, these results can be used to develop comprehensive theoretical models for the design of various technological processes. The values estimated by theoretical procedure and the experimental results demonstrated good agreement. The deviations for excess properties have been explained on the basis of the intermolecular interactions. The structural characteristics of the liquid components influence the trend of excess properties. They are hence results of molecular interactions.