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Related Experiment Videos

Predicting mixture phase equilibria and critical behavior using the SAFT-VRX approach.

Lixin Sun1, Honggang Zhao, Sergei B Kiselev

  • 1Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235-1604, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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The SAFT-VRX equation of state accurately models fluid phase diagrams for pure fluids and binary mixtures, including n-alkanes and CO2 mixtures. This equation accurately predicts vapor-liquid equilibrium and thermal properties.

Area of Science:

  • Thermodynamics
  • Physical Chemistry
  • Chemical Engineering

Background:

  • The SAFT-VR equation of state accurately models fluid behavior away from critical points.
  • Real fluid critical points exhibit nonanalytical behavior and asymptotic scaling.

Purpose of the Study:

  • To present a generalized SAFT-VRX equation of state for binary mixtures.
  • To accurately predict the vapor-liquid equilibrium (VLE) and pressure-volume-temperature (pvT) behavior of binary mixtures.

Main Methods:

  • The SAFT-VRX equation combines SAFT-VR with a crossover function for critical point behavior.
  • The generalized equation was applied to binary mixtures of n-alkanes and carbon dioxide + n-alkanes.

Main Results:

Related Experiment Videos

  • The SAFT-VRX equation accurately describes the global fluid phase diagram.
  • Accurate prediction of VLE, pvT behavior, gas-liquid critical loci, and thermal properties for studied binary mixtures.
  • Minimal fitting to experimental data was required.

    • Conclusions:

    • The generalized SAFT-VRX equation of state provides accurate predictions for binary mixtures.
    • This model effectively captures both critical and noncritical fluid behavior.