Phase equilibrium modelling for multi-component mixtures using highly accurate Helmholtz energy equation of state
by Taiming Luo; Alexei Yu. Chirkov
International Journal of Engineering Systems Modelling and Simulation (IJESMS), Vol. 11, No. 4, 2020

Abstract: Phase stability of a mixture at given conditions is studied. The modelling of equilibrium phase compositions is considered when the original phase of the mixture is unstable. The tangent plane distance criterion is used for stability analysis and the Gibbs energy minimisation is employed for phase equilibrium calculation when the successive substitution does not work well. With the Helmholtz free energy equation of state, thermodynamic properties in single phase and two-phase equilibrium were calculated for methane-ethane mixtures. Phase envelopes were also calculated.

Online publication date: Tue, 17-Nov-2020

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