Experimental vapor-liquid equilibria for the ternary system ethanol + water + 1-ethyl-3-methylpyridinium ethylsulfate and the corresponding binary systems at 101.3 kPa: Study of the effect of the cation

Abstract

A study on the isobaric vapor-liquid equilibria of the ternary system containing the ionic liquid 1-ethyl-3-methylpyridinium ethylsulfate (EMpyESO4) and the azeotropic mixture ethanol + water is presented inthis work. Experimental isobaric vapor-liquid equilibrium of the ternary system ethanol + water +EMpyESO4 was determined at 101.3 kPa, together with the vapor-liquid equilibria of the binary systemsethanol + EMpyESO4 and water + EMpyESO4. The experimental data obtained from the binary vapor-liquidequilibria were correlated using the NRTL and e-NRTL equations. The NRTL equation was also used tocorrelate the experimental vapor-liquid equilibrium of the ternary system. With the parameters obtainedfrom these correlations, the evolution of the azeotrope ethanol + water with different amounts of ionicliquid can be studied. The results obtained were compared with the isobaric vapor-liquid equilibria data ofthe system containing this azeotropic mixture with the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate.