EXTENSION OF THE AEOS MODEL TO SYSTEMS CONTAINING ANY NUMBER OF ASSOCIATING AND INERT COMPONENTS

The AEOS (association + equation of state) model is extended to mixtures containing any number of associating and inert components. The model is based on a continuous linear association scheme for molecules forming self-associates and cross-associates. The pure component parameters are determined from vapor pressure and liquid density data. The equation represents vapor-liquid equilibria over a wide pressure and temperature range with accuracy similar to that of experimental data. Results of calculating low-pressure vapor-liquid equilibria compare favorably with those obtained from activity coefficient methods. The well-established temperature dependence of the adjustable parameter makes possible a safe extrapolation beyond the experimental temperature range.