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Compressibility Factors Using the Soave-Redlich-Kwong Equation of State

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The Soave–Redlich–Kwong equation of state can accurately describe a compound in both liquid and vapor phases. This Demonstration applies this equation of state to estimate and plot the compressibility factor, , versus reduced pressure, , for ethane at various values of the reduced temperature, .

Contributed by: Housam Binous (March 2011)
Open content licensed under CC BY-NC-SA

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In the Soave–Redlich–Kwong equation of state, the compressibility factor is a solution of the following cubic equation:

,

where and with , , , and . Here is the acentric factor, and are the critical temperature and pressure, and = is the reduced temperature.

For ethane, , , and .

For more information on the compressibility factor, see http://en.citizendium.org/wiki/Compressibility_factor.

Reference

[1] Z. Nasri and H. Binous, "Applications of the Soave-Redlich-Kwong Equation of State Using Mathematica," Journal of Chemical Engineering of Japan, 40(6), 2007 pp. 534–538.

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