PHASE EQUILIBRIUM OF MULTICOMPONENT MIXTURES: CONTINUOUS MIXTURE GIBBS FREE ENERGY MINIMIZATION AND PHASE RULE

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Abstract
A phase equilibrium computational algorithm based on the minimization of the total Gibbs free energy of the multicomponent continuous system is introduced and the phase rule for a multi-family and multi-phase continuous mixture is formulated. Utilizing this technique it is now possible to perform phase equilibrium computations for mixtures containing both continuous component families and discrete components. Illustrative and comparative examples are introduced by using a continuous mixture equation of state, mixing rules, and combining rules. Comparisons of the experimental phase equilibrium data of a realistic gas-condensate system with the calculated results indicate excellent agreement between the two. The computational time required for the proposed algorithm is substantially reduced from the conventional pseudocomponent techniques.

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