Liquid−Liquid Equilibria, Density, Viscosity, and Surface and Interfacial Tension of the System Water +n-Butyl Acetate + 1-Propanol at 323.15 K and Atmospheric Pressure

Abstract

Liquid−liquid equilibrium (LLE) data are reported for the system water + n-butyl acetate + 1-propanol at 323.15 K and atmospheric pressure. The densities, viscosities, and surface tensions have been measured in the homogeneous liquid range for the binary and ternary liquid mixtures, and the liquid interfacial tensions of the conjugate phases located in the isothermal binodal curve have been determined at the same temperature and pressure. The experimental tie-line data were predicted by the UNIFAC method with good results. The empirical method of Othmer and Tobias was used for tie-line correlation, and the method of Pick et al. was applied for binodal data correlation. The molar volumes, Vm, the dynamic viscosity, η, and the surface tension, γ, of the binary systems were correlated in terms of composition using rational functions. The dilute regions of these systems deserved particular attention due to the physicochemical effects taking place in these regions. To describe the ternary system, binary pair additivity and a rational function were considered for the ternary contributions. The surface tension data of binary mixtures were correlated with the models of Fu et al. and Li et al., and the same models were applied for the prediction of ternary data. The liquid interfacial tension measured for the tie-lines was correlated using the relation proposed by Li and Fu.