Regression Of UNIQUAC Interaction Parameters And The Applications In Vapor-Liquid Equilibrium

In this paper, the merits and flaws and the development status of equation of state model and activity coefficient model used in solving the process of phase equilibria are introduced at first. The development history of UNIQUAC model is recalled in the paper, and Extended -UNIQUAC model is used to regress the experimental data of this work. The vapor-liquid phase equilibrium data of five binary systems include methanol/water, water/formicacid, ethanol/water, tetrahydrofuran/cyclohexane, water/aceticacid have been measured in this paper, and the thermodynamic consistency test have been made. And those binary vapor-liquid equilibrium data were applied to the regression of UNIQUAC interaction parameters. The average deviation between the model calculated and measured values is 0.00619, the maximum deviation is 0.01157.Also seven ternary system VLE data have been regressed by Extended -UNIQUAC model and the corresponding interaction parameters have been gotten, as well as the average deviation of the vapour phase and the average deviation of the genental, the results show that the deviation of Correlation results for ternary system is small. In this work, Extended -UNIQUAC, NRTL and WILSON model have been applied to prodict the composition of the vapor phase, the bubble point temperature of vapor-liquid equilibria for 90 binary systems(1703 experimental data) .with the forecast and related informations,vapor-liquid binary system balance have been studied. Also the optimum fitting frequencies for activity coefficient of correlation have been gotten, results show that the Extended -UNIQUAC model is superior in the average results, especial for the aqueous-organic system and alcohols results are well. It is is highly practical value in the chemical reaction engineering, separation engineering, chemical process research, development and design.