Residual Functions for the SRK and PR Equations of State
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In the gas phase, deviation from ideal behavior is taken into account by introducing residual functions, of the form . As pressure approaches zero, the gas behaves like an ideal gas, so that .[more]
This Demonstration plots the gas-phase residual properties for the gas propylene versus temperature (in Kelvin) using either the Soave–Redlich–Kwong (SRK) or the Peng–Robinson (PR) equation of state (EoS) [1, 2]. Use the slider to set the value of the pressure (in bar) and choose among three thermodynamic properties: (enthalpy in J/mol), (entropy in J/mol.K) or (Gibbs free energy in J/mol). At , we get an excellent agreement between the results of our calculations (red curve for the SRK EoS, blue for PR EoS) and their counterparts obtained with the Aspen Plus process simulator  (green squares).[less]
Contributed by: Housam Binous and Ahmed Bellagi (December 2016)
Open content licensed under CC BY-NC-SA
 J. M. Smith, H. C. Van Ness and M. M. Abbott, Introduction to Chemical Engineering Thermodynamics, 7th ed., Boston: McGraw-Hill, 2005.
 J. R. Elliott and C. T. Lira, Introductory Chemical Engineering Thermodynamics, 2nd ed., Englewood Cliffs, NJ: Prentice Hall International Editions, 2012.
 Aspentech. "Aspen Plus." (Dec 19, 2016) www.aspentech.com/products/engineering/aspen-plus.