Molecular interaction between ester with ethanol at different temperature using ultrasonic technique

Abstract

In this work, thermodynamic and acoustic properties of binary liquid mixtures of ethyl propionate with ethanol are determined at various temperatures and under ambient pressure. Experimental ultrasonic velocity, density, and viscosity of binary mixtures were measured at different temperatures of 308 K, 313 K, 318 K, 323 K, 328 K, and 333 K. Acoustical parameters such as acoustic impedance (Z), adiabatic compressibility (βa), Intermolecular free length (Lf), relaxation time (τ), internal pressure (π), and thermodynamic parameters like Gibb’s free energy (ΔG) and enthalpy (H) have been computed from the above primary parameters. The excess free length (LfE), excess internal pressure (πE) and excess enthalpy (HE) were derived using experimental data. Negative excess values are obtained for the binary system (ethyl propionate + ethanol). The non-linear variations are found for the thermo -acoustic parameters which imply the presence of complex formation in the binary system. The obtained results have been discussed in detail.