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

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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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Contributed by: Housam Binous (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

For more information about pressure effects, the Rackett equation, and the Pitzer–Curl method, see

[1] M. F. Doherty and M. F. Malone, *Conceptual Design of Distillation Systems*, New York: McGraw-Hill, 2001.

[2] B. E. Poling, J. M. Prausnitz, and J. P. O'Connell, *The Properties of Gases and Liquids*, 5th ed., New York: McGraw-Hill, 2004.

For more information about the SRK equation of state and the Wilson activity coefficients, see

[3] S. I. Sandler, *Chemical and Engineering Thermodynamics*, New York: John Wiley & Sons, 1999.

[4] J. R. Elliot and C. T. Lira, *Introductory Chemical Engineering Thermodynamics*, Upper Saddle River, NJ: Prentice Hall, 1999.