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Title: A method for multiphase equilibrium calculations
Authors: Han, G.
Rangaiah, G.P. 
Keywords: Equation-solving methods
Multiphase equilibrium calculations
Issue Date: 20-Jul-1998
Citation: Han, G.,Rangaiah, G.P. (1998-07-20). A method for multiphase equilibrium calculations. Computers and Chemical Engineering 22 (7-8) : 897-911. ScholarBank@NUS Repository.
Abstract: Methods for multiphase equilibrium calculations are generally based on Gibbs free energy minimization or equation-solving. Equation-solving methods, although superior to free energy minimization methods for phase equilibrium calculations without chemical reactions, often involve sequential procedures for a priori phase identification. A simultaneous equation-solving method (τ-method), based on modifying mole fraction summations, is proposed for these calculations. It requires the solution of a minimization problem only once, and provides phases actually present at equilibrium, their quantities and compositions simultaneously; and phase identification in advance is not required. Phase characteristic variable and pseudo phase are introduced, and their significance discussed, τ-method is shown by analysis and numerical results, to be consistent with Nelson's (1987, Comput. Chem. Engng 11, 581-591) criteria for phase existence. The method is tested on typical examples for two-phase (vapor-liquid and liquid-liquid) and three-phase (vapor-liquid-liquid) equilibrium calculations. For each example, several conditions and/or different initializations are used, and the minimization problem is solved by a version of successive linear programming method. The results show that τ-method is successful and reliable for multiphase equilibrium calculations. © 1998 Elsevier Science Ltd. All rights reserved.
Source Title: Computers and Chemical Engineering
ISSN: 00981354
Appears in Collections:Staff Publications

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