9814

Applying the Soave-Redlich-Kwong Equation of State

The Soave-Redlich-Kwong single equation of state can accurately describe both the liquid and vapor phase. This Demonstration applies this equation of state to estimate several properties of ethane and plots isotherms for various values of the temperature varying from 274.15 K to 303.15 K. The liquid and gas molar volumes (in ) as well as the vapor pressure (in bar) of ethane at the selected temperature (in K) are obtained using the equal area rule (i.e., both shaded areas must be equal). The coordinates of the two orange dots correspond to liquid and gas molar volumes while the coordinate is the vapor pressure. The behavior of the isotherm between these two points is not physically realizable. It is a portion of the isotherm where the specific volume will vary continuously at a fixed temperature and pressure; this is the two-phase coexistence region. This behavior is not peculiar to the Soave-Redlich-Kwong equation of state; indeed many other equations of state show this behavior.

SNAPSHOTS

  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
  • [Snapshot]

DETAILS

The Soave-Redlich-Kwong equation of state [1-3] is given by
,
where , ,
and .
Ethane’s critical temperature and pressure and acentric factor [2] are: , , and .
References:
[1] J. M. Prausnitz, R. N. Lichtenthaler and E. G. de Azevedo, Molecular Thermodynamics of Fluid-Phase Equilibria, 3rd ed., Upper Saddle River, NJ: Prentice Hall, 1999.
[2] S. I. Sandler, Chemical and Engineering Thermodynamics, 3rd ed., New York: Wiley, 1999.
[3] J. W. Tester and M. Modell, Thermodynamics and Its Applications, 3rd ed., Upper Saddle River, NJ: Prentice Hall, 1996.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.









 
RELATED RESOURCES
Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in Step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2014 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+