Prediction of volumetric and thermodynamic properties of two aromatic–alcohol mixtures using GMA equation of state

Abstract

In this work, we have calculated the densities of two mixtures composed of 1-propanol + toluene and ethanol + toluene at different temperatures, pressures, and compositions using GMA equation of state (EoS). We have also calculated some thermodynamic properties of these mixtures such as isobaric thermal expansion coefficient, isothermal compressibility coefficient, internal pressure, and excess functions such as the excess volumes, excess Gibbs free energy, excess enthalpy, excess entropy, excess internal energy, and excess Helmholtz free energy. A wide comparison with the experimental data shows the ability of this equation of state to reproduce and predict different thermodynamic properties. The composition dependence of the parameters of this equation of state has been assumed as quadratic functions of mole fraction. Using these quadratic mixing rules, the excellent agreement has been obtained between the calculated values and experimental data. To assess the validity of GMA EoS, the density of studied mixtures has been calculated based on this equation of state and Tait equation and compared using statistical parameters. The lower values of statistical parameters obtained by GMA EoS for these mixtures confirm the ability of this EoS to reproduce and predict the density of mixtures.