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The Soave[1]equation of state is extensively accepted because of its accuracy andsimplicity.In 1988,Tan et al.[2]suggested a modification by introducing atemperature-dependent factor to parameter“b”on the basis of statistical meaning,anda good accuracy was obtained for supercritical fluids as well as fluids approaching criti-cal conditions but not for mixtures.In the previous work,an extended Soave equa-tion of state[3]has been proposed to improve the prediction of liquid density.In thispaper,the extended equation is used to calculate vapor-liquid equilibria of mixtures atsubcritical conditions.
The Soave [1] equation of state is widely accepted because of its accuracy and simplicity. 1988, Tan et al. [2] suggested a modification by introducing a temperature-dependent factor to parameter “b ” on the basis of statistical meaning, anda good accuracy was obtained for supercritical fluids as well as fluids approaching criti-cal conditions but not for mixtures.In the previous work, an extended Soave equa- tion of state [3] has been proposed to improve the prediction of liquid density. thispaper, the extended equation is used to calculate vapor-liquid equilibria of mixtures at subcritical conditions.