# High-Pressure Vapor-Liquid Equilibrium Data for a Binary Mixture: the Poynting Factor Correction

High-Pressure Vapor-Liquid Equilibrium Data for a Binary Mixture: the Poynting Factor Correction

Consider a binary mixture composed of -hexane and -heptane. This Demonstration computes and plots the isobaric vapor-liquid equilibrium diagram, the equilibrium curve, the relative volatility, the -value, the gas-phase fugacity coefficients using the Soave–Redlich–Kwong equation of state (EOS), and the Poynting correction factor for user-specified values of the pressure. The Demonstration takes into account deviation from ideal behavior in the gas phase by including gas phase fugacity coefficients. Thus high-pressure VLE data can be obtained. This Demonstration allows for the Poynting factor correction. Snapshots present calculations at a pressure approximately equal to 303.975 kPa.

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VLE data is computed using the following formula (the gamma-phi-poy equation):

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