Density and Refractive Index at 298.15 K and Vapor−Liquid Equilibria at 101.3 kPa for Binary Mixtures of Water + N-Ethylpiperazine

Abstract

Densities and refractive indices at 298.15 K and isobaric vapor−liquid equilibrium (VLE) data at 101.3 kPa have been measured for binary mixtures of water + N-ethylpiperazine. Excess molar volumes and refractive index deviations are calculated from the measurement results. Negative values for excess molar volumes are observed over the whole composition range, whereas refractive indices exhibit positive deviations from linear additive values. VLE data are tested for thermodynamic consistency and are correlated by the Wilson equation with satisfactory results. This binary system has no azeotrope.