Thermodynamics of binary mixtures containing organic carbonates Part XI.: SLE measurements for systems of diethyl carbonate with long n-alkanes:: comparison with DISQUAC and modified UNIFAC predictions

Using the available interaction parameters for organic carbonate + alkane mixtures the ability of the DISQUAC and modified UNIFAC group contribution model to predict solid-liquid equilibria (SLE) is investigated. Six sets of the SLE temperatures for diethyl carbonate + n-alkane (octadecane, eicosane, docosane, tetracosane, hexacosane, octacosane) systems have been measured by a dynamic method from 278.65 K to the melting point of the long chain n-alkane. The data have been correlated by three equations: Wilson, UNIQUAC and NRTL. The existence of a solid-solid first-order phase transition in n-alkanes has been taken into consideration in the solubility calculations. The relative standard deviations of the solubility temperature correlation for all measured data vary from 0.31 to 0.34 K and depend on the particular equation used. The SLE curves are usually well predicted by DISQUAC and modified UNIFAC models with average standard deviation of < 1.35 K. (C) 2001 Elsevier Science B.V. All rights reserved.