Twu-Sim-Tassone equation of state: Difference between revisions

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==References==
==References==
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[[category: equations of state]]

Revision as of 22:37, 4 November 2011

Twu, Sim and Tassone presented a cubic equation of state for accurate representation of hydrocarbon that has become known as the Twu-Sim-Tassone or TST equation of state[1]. With a critical compressibility factor Zc of 0.2962, it better represents many the compressibility of than the Redlich-Kwong equation of state, including the Soave modified version, and the Peng and Robinson equation of state and has been shown to better represent long chain hydrocarbons[2].

The equation follows the general cubic form resulting in the equation:

p=RTVm−b−a(Vm−0.5b)(Vm+3b)

Where Vm is the molar volume, and a and b are the attractive and repulsive parameters akin to those of the Van der Waals equation of state.

References

  1. ↑ Twu, C.H., et al, "A Versatile Liquid Activity Model for SRK, PR and A New Cubic Equation of State TST." Fluid Phase Equilibria, 194-197, pp. 385-399, (2002)
  2. ↑ Twu, C.H., Sim, W.D., Tassone, V. "Getting a Handle on Advanced Cubic Equation of State." Measurement & Control, pp. 58-65, (2002).
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