A conceptually new mixing rule for cubic and non-cubic equations of state

A conceptually new method to combine pure compound equations of state (EOSs ) for the calculation of mixture properties is proposed. As for the case of EOSs using the one-fluid approach, the new method accounts for the effect of density on the excess properties. On the other hand, as for activity coe fficient models, the new technique gives the ideal solution behavior in the absence of adjustable parameters. The new approach is consistent with seve ral accepted thermodynamic limits. The simplest variant of the new model ha s a quantitative performance which depends on the complexity of the system under study. (C) 1999 Elsevier Science B.V. All rights reserved.