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Vapour‐liquid equilibrium and distillation scheme for the hydrochloric acid‐ethanol‐water ternary mixture
Author(s) -
López Vélez José Sebastián,
DobroszGómez Izabela,
Gómez García Miguel Ángel
Publication year - 2016
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22605
Subject(s) - ternary operation , reboiler , distillation , non random two liquid model , chemistry , hydrochloric acid , thermodynamics , relative volatility , ethanol , residue (chemistry) , extractive distillation , chromatography , organic chemistry , activity coefficient , aqueous solution , computer science , physics , programming language
This work reports the Vapour‐Liquid Equilibrium (VLE) data, at 78 kPa, for a HCl‐ethanol‐water ternary mixture at low HCl content (x ≤ 0.137, which corresponds to HCl usual commercial form). The data were adjusted using the electrolyte‐NRTL activity model. The obtained predictions presented an absolute average deviation of 0.853 %. Next, this model was used to construct the residue curve map of the HCl‐ethanol‐water mixture. The analysis of its topology provided a fundamental understanding of the ternary mixture behaviour upon distillation process. Four different separation regions were identified. Finally, based on the residue curve map, a distillation column was designed to accomplish three design constraints: HCl‐water commercial product composition, maximum ethanol recovery for recycle, and minimum energetic duty in the reboiler.