Vapor–Liquid Equilibrium of Water + Ethanol+ Glycerol: Experimental Measurement and Modeling for Ethanol Dehydrationby Extractive Distillation.

Thepresent work aims at establishing reliable activity coefficientmodel for vapor–liquid equilibrium (VLE) of the system water+ ethanol + glycerol, with an emphasis on the application in ethanoldehydration by extractive distillation. New experimental data werereported for ternary VLE at 100 kPa, boiling temperature of water+ glycerol at 101.33 kPa, and infinite dilution activity coefficientof water and ethanol, respectively, in glycerol at five temperaturesof 313.15 K to 393.15 K. The NRTL equation was used for the modeling.For extending the composition and temperature range of data source,literature data of binary VLE of water + ethanol, infinite dilutionactivity coefficients of water + ethanol, and excess enthalpies ofwater + glycerol were also used for optimization of the NRTL parameters.The correlation showed that the azeotrope of water + ethanol can beremoved at a glycerol mass fraction of 0.0902. The experimental resultswere compared graphically with those of calculations, showing goodagreement. Comparisons were also presented for experimental resultsand correlations available in the literature. [ABSTRACT FROM AUTHOR]