CALCULATION OF THE THERMODYNAMIC EQUILIBRIUM OF A MULTICOMPONENT TWO-PHASE SYSTEM BASED ON MINIMIZATION OF THE GIBBS POTENTIAL

The authors have proposed a method to model the thermodynamic equilibrium of the two-phase multicomponent system "solution–vapor" by solving a system of ordinary differential equations following from the principles of nonequilibrium thermodynamics and statistical physics. Calculation of the thermodynamics of liquid and vapor phases was based on the equation of state. During the solution of the system of ordinary differential equations, the authors determined the molar volumes of the solution and the vapor, the molar composition of the phases, and the pressures of the onset of boiling of the solution and condensation of the vapor. The proposed method is fundamentally different from the popular empirical Rachford–Rice method. Results of calculating with this method have been presented.
   
Author:  I. V. Derevich and A. A. Panova
Keywords:  Gibbs potential, thermodynamic equilibrium, nonequilibrium thermodynamics, thermodynamic equation of state, fugacity, phase-equilibrium line
Page:  247