Activity coefficient Correlations and Uses

الملخص

Design of industrial equipment requires phase equilibrium data to correlate liquid vapor phases with accurate precision. Fugacity coefficients and activity coefficient are factors used in petrochemical industries to minimize the deviations from ideal behavior in a mixture of chemical substances. In an ideal mixture, the microscopic interactions between each pair of chemical species are the same and, are correlated thermodynamically through complex relations associated with entropy and Gibbs free energy correlations. As a result, properties of the mixtures can be expressed directly in terms of simple concentrations or partial pressures of the substances present e.g. Raoult's law. Deviations from ideality are accommodated by modifying the concentration by an activity coefficient. This review paper present a comparison between leading methods dealing with estimation of activity coefficients in literature. Deviation varies from different structure to another based on molecular structure of the compounds and molecular constituents. Liquid vapor phase equilibria calculations are essential requirements in industrial design. The calculations of activity coefficient and fugacity coefficient play an important role in thermodynamic calculations.