Abstract
It is demonstrated that with the use of proper statistical mechanical mixing rules in empirical equations of state it is possible to predict the vapor—liquid equilibrium (VLE) and vapor—liquid—liquid equilibrium (VLLE) of highly polar multicomponent mixtures. It is also shown that the new mixing rules are capable of predicting the VLE and VLLE data of a given mixture, simultaneously, with the use of only one set of unlike-binary interaction parameters. In predicting the VLE data of ternary mixtures using equations of state a common problem has been the inaccuracy of prediction around the critical solution point of the mixture. This problem is resolved here through the inclusion of the unlike-three-body intermolecular interaction contribution in formulating the VLE algorithm. A number of sample calculations demonstrating the correcting roles of the new mixing rules and unlike-three-body contribution in VLE and VLLE predictions is presented.
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