Measurements of the Excess Properties and Vapor-Liquid Equilibria at 101.32 kPa for Mixtures of Ethyl Ethanoate plus Alkanes (from C-5 to C-10)

Abstract

This work presents experimental values for the excess volumes (V mE) at 291.15, 298.15, 318.15, and 328.15 K; excess enthalpies (HmE) at 291.15, 298.15, and 318.15 K; and vapor - liquid equilibria (VLE) at 101.32 kPa for mixtures of ethyl ethanoate with each of six alkanes (from pentane to decane). The results for the six mixtures show that the thermal coefficient (∂Vm E/∂T)p is positive and that (∂Hm E/∂T)p presents changes in the sign. The Fredenslund method was applied to establish the thermodynamic consistency of the VLE data. Of the six systems considered here, only two, ethyl ethanoate + hexane and ethyl ethanoate + heptane, form minimum-boiling azeotropes, with coordinates (x az, Taz/K) of (0.339, 338.15) and (0.834, 349.99), respectively. Simultaneous correlations carried out with the VLE and H mE data using a polynomic model with temperature-dependent coefficients were found to be acceptable. Application of two different versions of the UNIFAC model for the VLE data, one by Hansen et al. (Ind. Eng. Chem. Res. 1991, 30, 2355) and the other by Gmehling et al. (Ind. Eng. Chem. Res. 1993, 32, 178), gave similar estimations for the six systems, which we consider to be acceptable. The second method gave good predictions of Hm E. © 2010 American Chemical Society.