Abstract
The excess molar volume V E data of the binary liquid systems were correlated by the Peng–Robinson–Stryjek–Vera equation of state coupled with two different types of mixing rules: composition dependent van der Waals mixing rule (vdW) and the mixing rule based on the Gupta–Rasmussen–Fredenslund method (GRF), with the NRTL equation as G E model. The results obtained by these models show that type of applied mixing rule, a number and position of interaction parameters are of great importance for a satisfactory correlation of V E data. The GRF mixing rules coupled with the NRTL model gave mostly satisfactory results for V E correlation of the nonideal binary systems of diverse complexity.
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