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Vapor‐Liquid Equilibrium of MTBE‐Methanol, MTBE‐Methanol‐Calcium Chloride and MTBE‐Methanol‐Lithium Chloride Mixtures
Author(s) -
Abu AlRub F. A.,
AbdelJabbar N.,
Darwish N.,
Ghanem H.
Publication year - 2002
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 - 10.1002/1521-4125(20020709)25:7<729::aid-ceat729>3.0.co;2-b
Subject(s) - chemistry , methanol , non random two liquid model , unifac , bubble point , boiling point , lithium chloride , activity coefficient , inorganic chemistry , organic chemistry , bubble , aqueous solution , parallel computing , computer science
Isobaric vapor‐liquid equilibria of methyl tert‐butyl ether (MTBE)‐methanol, MTBE‐methanol‐calcium chloride, and MTBE‐methanol‐lithium chloride mixtures were measured at 93.57 kPa using a Malanowski equilibrium still which circulates both the vapor and liquid phases. The experimental results of the salt‐free system showed that MTBE‐methanol forms a minimum boiling azeotrope of 69.80 mol.‐% MTBE at 93.57 kPa and 322.67 K. The experimental results of the salt‐free system were predicted using the original UNIFAC and the UNIFAC‐Dortmund methods, where the vapor‐phase compositions were predicted with root‐mean‐square deviations (RMSD) of 0.0046 and 0.0091, respectively, and the bubble point temperatures were predicted with RMSD of 0.36 and 0.71 K, respectively. The Wilson and the nonrandom two‐liquid (NRTL) models could satisfactorily correlate the experimental data of the salt‐free mixtures with RMSD in the vapor‐phase compositions calculation of 0.0047 and 0.0059, respectively and in bubble‐point temperatures calculation of 0.20 and 0.40 K, respectively. Addition of either calcium chloride or lithium chloride to the MTBE‐methanol mixtures resulted in salting‐out the MTBE and shifting the azeotropic point to a vapor composition of 76.5 mol.‐% and 93.0 mol.‐% MTBE, respectively. Both the Tan‐Wilson and Tan‐NRTL models could satisfactorily predict the bubble‐point temperatures of the MTBE‐methanol‐calcium chloride mixtures with RMSD of 0.143 and 0.130 K, respectively, and the vapor phase compositions with RMSD of 0.0055 and 0.0041, respectively.