Abstract
The Patel-Teja equation of state (PT EOS), coupled with the new mixing rule for the energy parameter ( a) developed by Kurihara et al. (1987), has been successfully applied to vapor-liquid equilibrium (VLE) calculations for strongly non-ideal mixtures. Three excess Gibbs energy ( g E) models—Wilson, NRTL and UNIQUAC—were used to represent the residual part of excess Gibbs energy at infinite pressure ( g E∞) in the new mixing rule. The UNIQUAC model is recommended. Fourteen sets of low pressure and eight sets of high pressure binary/ternary VLE data were examined. For low pressure VLE calculations, comparable results were obtained using the activity coefficient approach, the EOS density dependent local composition mixing rule approach, and the proposed new model. The chief advantages of the new model lie in its applicability to high pressure VLE calculations, its improved liquid density predictions, its capacity to describe liquid-liquid equilibria, and its retention of the simple cubic EOS form.
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