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Energy Evaluation of Ethanol Dehydration with Glycol Mixture as Entrainer
Author(s) -
Benyahia Khadidja,
Benyounes Hassiba,
Shen Weifeng
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300872
Subject(s) - ethylene glycol , dehydration , chemistry , reboiler , ethanol , non random two liquid model , glycerol , solvent , extractive distillation , distillation , chromatography , azeotrope , organic chemistry , aqueous solution , activity coefficient , biochemistry
Extractive distillation of ethanol dehydration using glycols as entrainers is proposed. Specifically, ethanol dehydration of an azeotropic mixture in the presence of ethylene glycol + glycerol mixture is evaluated. Simulation is performed and the vapor‐liquid equilibrium of ethanol + water + ethylene glycol + glycerol is predicted with the NRTL model. Minimization of energy consumption in both extractive and regeneration columns is attempted. Optimal operating parameters of the process including glycol concentration in the solvent mixture, main feed, and entrainer feed trays, total number of theoretical trays, and heat supplied to the reboiler are determined in order to achieve a specified distillate purity of 99.9 mol % ethanol.