APPLICATIONS OF A GENERALIZED EQUATION OF STATE FOR ASSOCIATING MIXTURES

A generalized equation of state that explicitly recognizes self-association and cross-association has been evaluated for systems with two associating species at high pressures as well as low pressures. Forty-five systems were evaluated for components ranging from water to propanol. The Soave equation of state and the UNIFAC model were used for comparison. Percent average absolute deviations in bubble-point pressure were 3.54 for the Soave equation, 2.53 for UNIFAC, and 1.62 for the association model. Generalized correlations of the pure-component parameters and a single binary interaction parameter were used for all models. Some limitations are discussed, but the results show that the reaction equilibrium approach is a clear improvement over the Soave equation of state and competitive with UNIFAC.