Twu-Sim-Tassone equation of state

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 $Z_{c}$ 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={\frac {RT}{V_{m}-b}}-{\frac {a}{(V_{m}-0.5b)(V_{m}+3b)}}

Where $V_{m}$ 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

↑ 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)
↑ Twu, C.H., Sim, W.D., Tassone, V. "Getting a Handle on Advanced Cubic Equation of State." Measurement & Control, pp. 58-65, (2002).

[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).

[1]

[2]

Twu-Sim-Tassone equation of state

References

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