Prediction of the pressure dependence on the thermodynamic properties of dialkyl carbonate + alkane mixtures using Nitta–Chao model

Abstract

In this work we analyze the ability of the Nitta–Chao model for the prediction of the pressure dependence of different thermodynamic properties, such as density, isobaric thermal expansivity coefficient, isothermal compressibility coefficient and internal pressure of the pure components (dimethyl carbonate and diethyl carbonate). We also study phase equilibria, pVTx values and their derived coefficients, internal pressures, excess molar volumes, excess molar enthalpies and excess Gibbs energies of dialkyl carbonate+ n-alkane binary mixtures. For this purpose we have used the characteristic parameters calculated in a previous paper for dialkyl carbonate+ n-alkane systems with a database which contained thermodynamic properties values at atmospheric pressure or near to the atmospheric pressure. The Nitta–Chao model predicts the different thermodynamic properties fairly well in the ranges of temperature 278.15 K<T<353.15 K and of pressure 0.1 MPa<p<60 MPa. It is important to point out that both ranges are much broader than those of the experimental values of the thermodynamic properties database used to determine the parameters.