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Progress in Petrochemical Science

Experimental Measurement and Thermodynamic Modelling of Vapor-Liquid Equilibria Correlations for Prediction Azeotropic Behavior and Fitting Multicomponent Mixtures Data

  • Open or Close Khalid Farhod Chasib*

    Petroleum & Gas Engineering Department, University of Thi Qar, Thi Qar, Iraq

    *Corresponding author: Khalid Farhod Chasib, Petroleum & Gas Engineering Department, Collage of Engineering, University of Thi Qar, Thi Qar, Iraq, Tel: +964-790-2-89-80-18; Email:

Submission: February 19, 2018; Published: March 09, 2018

Volume1 Issue2
March 2018


In this study, isobaric vapor-liquid equilibrium for two ternary systems: “1-Propanol-Hexane-Benzene” and its binaries “1-Propanol-Hexane, Hexane-Benzene and 1-Propanol-Benzene” and the other ternary system is “Toluene-Cyclohexane-iso-Octane (2,2,4-Trimethyl-Pentane)” and its binaries “Toluene-Cyclohexane, Cyclohexane-iso-Octane and Toluene-iso-Octane” have been measured at 101.325KPa. The measurements were made in re-circulating equilibrium still with circulation of both the vapor and liquid phases. The ternary system “1-Propanol-Hexane-Benzene” which contains polar compound (1-Propanol) and the two binary systems “1-Propanol-Hexane and 1-Propanol-Benzene” form a minimum azeotrope, the other ternary system and the other binary systems do not form azeotrope.

Correlation equations for expressing the boiling temperature as direct function of liquid composition have been tested successfully and applied for predicting azeotropic behavior of multi component mixtures and the kind of azeotrope (minimum, maximum and saddle type) using modified correlation of Gibbs-Konovalov theorem. Also, the binary and ternary azeotropic point has been detected experimentally using graphical determination on the basis of experimental binary and ternary vapor-liquid equilibrium data.

All the data passed successfully the test for thermodynamic consistency using McDermott-Ellis test method [1]. The maximum likelihood principle is developed for the determination of correlations parameters from binary and ternary vapor-liquid experimental data which provides a mathematical and computational guarantee of global optimality in parameters estimation for the case where all the measured variables are subject to errors and the non ideality of both vapor and liquid phases for the experimental data for the ternary and binary systems have been accounted. The agreement between prediction and experimental data is good. The exact value should be determined experimentally by exploring the concentration region indicated by the computed values.

Keywords: Vapor Liquid Equilibria; Azeotropic Behavior; Multi-component system

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