Thermodynamic and thermophysical properties of chemicals of industrial and environmental interest Measurement and modeling

Abstract

The present thesis is part of a general program of research concerning the thermophysical and thermodynamic properties of binary mixtures containing molecules of industrial and environmental interest. The first part presents the experimental results of densities, speeds of sound and refractive indices measurements of twelve (12) binary mixtures at different temperatures and at pressure of 0.1 MPa. The measured data has been utilized to compute isentropic compressibility, intermolecular free length, specific acoustic impedance, relative association, relaxation strength and Rao's molar sound function. The excess/deviation properties such as excess molar volume, deviations in isentropic compressibility, deviations in intermolecular free length, deviations in acoustic impedance, deviations in speed of sound and deviation of refractive index were also calculated for all studied mixtures under the same experimental conditions. The correlation of excess properties was made by help of the Redlich-Kister polynomial equation. The second part contains vapor-liquid equilibrium data of three binary mixtures measured by means of a static apparatus at several temperatures. The obtained results were correlated with the Antoine equation. From these data, the excess Gibbs function and the vapor phase composition were evaluated using the Barker’s method. The activity coefficients of the components in binary mixtures were also estimated. Additionally, the experimental data were correlated by using three activity coefficient models NRTL, UNIQUAC and Modified UNIFAC (Dortmund).