Assessment of the Effect of Different Mixing Rules on Thermodynamic Properties of Mixtures

The purpose of this paper is to test the effect of five different mixing rules on the calculated thermodynamic properties including vapor pressure and density and excess property of some binarymixtures. These properties are calculated by ISM (Ihm Song Mason) EOS and PHS (Perturb Hard Sphere) EOS. Different mixing rules do not behave the same in predicting the three aforementioned properties. The Fit (MADAR-5) mixing rule gives rise to more acceptablevalues, it is found that, when the mixture components are similar in size, different mixing rules often do not change the errors in calculated properties more than5 .%However, as the size similarity decreases, the effect of applied mixing rules becomes more important.

Keywords:

thermodynamic , mixture , mixing rule