Phase Equilibrium of Binary Mixtures ofn-Hexane + Branched Chlorobutanes: Experimental Results and Group Contribution Predictions

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In this work the study of the phase equilibrium (experimental and modeled) of three binary mixtures formed by n -hexane and a branched chlorobutane (2-chlorobutane, 1-chloro-2-methylpropane, or 2-chloro-2-methylpropane) is presented. New and consistent experimental vapor–liquid equilibrium data at isothermal conditions T = (288.15, 298.15, and 308.15) K have been obtained and correlated using the Wilson equation. In addition, two group contribution models, modified-UNIFAC (universal functional activity coefficient) and VTPR (volume-translated Peng–Robinson), have been used to predict the vapor–liquid equilibrium of the mixtures. The agreement between experimental results and predicted ones is not satisfactory.