Phase equilibrium modelling for multi-component mixtures using highly accurate Helmholtz energy equation of state. (10th November 2020)

• Record Type: Journal Article
• Authors: Luo, Taiming; Chirkov, Alexei Yu.
• Is Part Of: International journal of engineering systems modelling and simulation. Volume 11:Number 4(2020)
• Page Start: 138
• Page End: 146
• Publication Date: 2020-11-10
• Subjects: phase equilibrium -- phase envelopes -- Helmholtz energy equation of state -- stability analysis -- tangent plane distance criterion; Engineering systems -- Computer simulation -- Periodicals; Engineering systems -- Mathematical models -- Periodicals; 620.0042
• Languages: English
• ISSNs: 1755-9758

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.