Isobaric Vapor–Liquid Equilibria for Ethanol + Water + Ethylene Glycol and Its Constituent Three Binary Systems

Abstract

Isobaric vapor−liquid equilibria were measured for the ternary system ethanol + water + ethylene glycol and its three constituent binary mixtures at 101.3 kPa using a modified Rogalski−Malanoski equilibrium still. The thermodynamic consistency of experimental binary data was checked using the point and area tests. The experimental binary data were then correlated by the Wilson, nonrandom two-liquid (NRTL), and universal quasichemical activity coefficient (UNIQUAC) equations. The ternary vapor− liquid equilibria data were predicted using the binary parameters for the three equations with good accuracy. The selectivity of ethylene glycol as entrainer for the separation of the azeotropic system ethanol + water by extractive distillation was discussed using the NRTL parameters.

Approach to the 1-propanol dehydration using an extractive distillation process with ethylene glycol

“…Once again data from Liu et al [13] do not match with our experimental data. On the other hand, data from Kamihama et al [15] fully agree with experimental data from this work.…”

“…Experimental VLE data of the ternary system have not been published previously. On the other hand, binary VLE data of 1-propanol (1) + ethylene glycol (3) and water (2) + ethylene glycol (3) systems are available in the literature [13][14][15]. Reported data have been compared with those obtained in this work.…”

Viscosity and density data for the ternary system water(1)–ethanol(2)–ethylene glycol(3) between 298.15K and 328.15K

“…Besides many other applications, this solvent is used as entrainer for the separation of waterethanol mixtures by means of extractive distillation [3][4][5][6][7][8][9]. To design or simulate this process, sound knowledge of the physical and transport properties of this ternary mixture is important.…”

Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

“…39,45,46 The results are shown in Figure S1 (see Supporting Information), and the VLE data of ethanol (1) 1 water (2) is listed in Supporting Information Table S1. It can be seen from Supporting Information Figure S1 that the x-y curves almost overlap each other, verifying the reliability of the experimental apparatus.…”