Title: Phase equilibrium modelling for multi-component mixtures using highly accurate Helmholtz energy equation of state

Authors: Taiming Luo; Alexei Yu. Chirkov

Addresses: Bauman Moscow State Technical University, Moscow 105005, Russia ' Bauman Moscow State Technical University, Moscow 105005, Russia

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.

Keywords: phase equilibrium; phase envelopes; Helmholtz energy equation of state; stability analysis; tangent plane distance criterion.

DOI: 10.1504/IJESMS.2020.111265

International Journal of Engineering Systems Modelling and Simulation, 2020 Vol.11 No.4, pp.138 - 146

Received: 14 Sep 2019
Accepted: 16 Jan 2020
Published online: 17 Nov 2020 *

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