Isobaric vapor–liquid equilibrium for binary and ternary systems with toluene, 2-methoxyethanol and dimethyl sulfoxide at 101.3 kPa

Abstract Isobaric vapor–liquid equilibrium (VLE) data for binary systems of toluene + 2-methoxyethanol, 2-methoxyethanol + dimethyl sulfoxide (DMSO) and toluene + DMSO were obtained by using a Fischer VLE 602 equipment at 101.3 kPa, as well as for the ternary system of toluene + 2-methoxyethanol + DMSO. The binary VLE data were considered to be thermodynamically consistent according to the Wisniak's modification of the Herington test and the Wisniak's L–W test. It was determined that toluene and 2-methoxyethanol form binary azeotrope at 379.08 K, 70.2 mol% toluene at 101.3 kPa. The binary VLE data were correlated by using Wilson, NRTL and UNIQUAC models with minor deviations. The ternary system was well predicted from binary interaction parameters and passed both the Wisniak–Tamir's modification of McDermott–Ellis test and the Wisniak's L–W test. Besides, the ternary VLE data were also satisfactorily correlated by using Wilson, NRTL and UNIQUAC models. Moreover, the change of phase equilibria behavior of toluene and 2-methoxyethanol due to the addition of DMSO is significant. Therefore, DMSO is recommended as a promising entrainer for the separation of toluene and 2-methoxyethanol azeotropic mixture by extractive distillation.

[1]  J. Prausnitz,et al.  Statistical thermodynamics of liquid mixtures: A new expression for the excess Gibbs energy of partly or completely miscible systems , 1975 .

[2]  K. Rubini,et al.  Molar heat capacities, densities, viscosities, and refractive indices of dimethyl sulfoxide + tetrahydropyran and + 2-methyltetrahydrofuran at (293.15, 303.15, and 313.15) K , 2007 .

[3]  J. Prausnitz,et al.  LOCAL COMPOSITIONS IN THERMODYNAMIC EXCESS FUNCTIONS FOR LIQUID MIXTURES , 1968 .

[4]  Zhigang Lei,et al.  Extractive Distillation: A Review , 2003 .

[5]  Xiuxiu Ma,et al.  Thermodynamic and spectroscopic studies for aqueous solution of ethylene glycol monomethyl ether , 2011 .

[6]  Juan B. Montón,et al.  Evaluation of the 2-Methoxyethanol as Entrainer in Ethanol–Water and 1-Propanol–Water Mixtures , 2013 .

[7]  Jaime Wisniak,et al.  The Herington test for thermodynamic consistency , 1994 .

[8]  C. M. Kinart,et al.  Density, Relative Permittivity, and Viscosity at Various Temperatures for 2-Methoxyethanol + Propylamine Mixtures , 2002 .

[9]  E. F. G Herington,et al.  Test for the consistency of experimental isbalic vapor-liquid equilibrium data , 1951 .

[10]  S. Ellis,et al.  A multicomponent consistency test , 1965 .

[11]  J. Wisniak.  A new test for the thermodynamic consistency of vapor-liquid equilibrium , 1993 .

[12]  P. Bai,et al.  Isobaric Vapor–Liquid Equilibrium of Binary and Ternary Systems with 2-Ethoxyethanol + Ethylbenzene + Dimethyl Sulfoxide , 2013 .

[13]  Hui Liu,et al.  Predictive molecular thermodynamic models for liquid solvents, solid salts, polymers, and ionic liquids. , 2008, Chemical reviews.

[14]  J. Wisniak,et al.  Vapor-liquid equilibriums in the ternary systems water-formic acid-acetic acid and water-acetic acid-propionic acid , 1977 .

[15]  P. Venkatesu,et al.  Vapor–liquid equilibrium for the binary mixtures of dimethylsulfoxide with substituted benzenes , 2007 .

[16]  Edward A. Grens,et al.  Evaluation of parameters for nonlinear thermodynamic models , 1978 .

[17]  G. M. Wilson,et al.  Vapor-Liquid Equilibrium. XI. A New Expression for the Excess Free Energy of Mixing , 1964 .

[18]  Harshit Agarwal,et al.  Study of molecular interactions in binary mixtures of formamide with 2-methoxyethanol and 2-ethoxyethanol at varying temperatures , 2013 .

[19]  P. Bai,et al.  Isobaric vapor–liquid equilibrium for binary system of methanol and acetonitrile , 2013 .