Prediction of Vapor-Liquid Equilibrium Using Modified UNIFAC Model Parameters Combined with the Mixing Rule of HVOS

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Abstract The model for predicting vapor-liquid equilibria of mixtures at an infinite pressure reference state was presented by PR equation of state combined with Larsen UNIFAC activity coefficient model using the Orbey and Sandler's mixing rule of HVOS.In this model the parameter C~* in equation of state was given without the change of temperature,C~*=(-0.623 23).A revision of total 12 pairs of group interaction parameters of Larsen UNIFAC model was done by using the latest vapor-liquid equilibrium data in large range of temperature and wide range of systems.And predictions of vapor-liquid equilibria including alcohol,acid,ketone,water,nitrile and amine systems were made by using the new parameters and original parameters respectively.The results show that a significant improvement of prediction was achieved for many systems.The mean absolute deviations of calculation of vapor-composition were less than 4.00��10~(-2),and the mean relative deviations of bubble-pressure was less than 6.00%.

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Received 2006-09-15; published 2006-09-15

Cite this article:

WANG Xiao-qing,XUE Rong-shu,WEI Shun-an.Prediction of Vapor-Liquid Equilibrium Using Modified UNIFAC Model Parameters Combined with the Mixing Rule of HVOS[J] Chemcial Industry and Engineering, 2006,V23(5): 423-427

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