Abstract
A closed-form equation of state for associated systems derived on the basis of the general thermodynamic framework developed by Hu, Azevedo, Lüdecke and Prausnitz is presented. A dimerization model and Redlich-Kwong equation are adopted for accounting for chemical and physical interactions respectively. Chemical and physical parameters were obtained by fitting experimental vapor-pressure and liquid-density data except in the case of carboxylic acids, for which the chemical association constants were estimated mainly from vapor-phase pVT measurements. Calculations of pure- component properties and vapor-liquid equilibria for mixtures containing associated and nonassociating molecules show that the present method is superior to other more complicated association models and usual activity-coefficient methods in most cases except for aqueous solutions.
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