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A global optimization technique for solid-liquid equilibrium calculations : application to calcium phosphate precipitation

Montastruc, Ludovic and Azzaro-Pantel, Catherine and Biscans, Béatrice and Davin, André and Pibouleau, Luc and Domenech, Serge A global optimization technique for solid-liquid equilibrium calculations : application to calcium phosphate precipitation. (2002) In: 12th European Symposium on Computer Aided Process Engineering - ESCAPE 12, 26-29 may 2002 , The Hague ,Netherlands .

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Official URL: http://www.elsevier.com/wps/find/bookdescription.cws_home/623421/description#description

Abstract

Phase equilibrium calculations constitute an important problem for designing and optimizing crystallization processes. The Gibbs free energy is generally used as an objective function to find the quantities and the composition of phases at equilibrium. In such problems, the Gibbs free energy is not only complex but can have several local minima. This paper presents a contribution to handle this kind of problems by implementation of a hybrid optimization technique based on the successive use of a Genetic Algorithm (GA) and of a classical Sequential Quadratic Programming (SQP) method: the GA is used to perform a first search in the solution space and to locate the neighborhood of the solution. Then, the SQP method is employed to refine the solution. The basic operations involved in the design of the GA developed in this study (encoding with binary representation of real values, evaluation function, adaptive plan) are presented. Calcium phosphate precipitation which is of major interest for P-recovery from wastewater has been adopted as an illustration of the implemented algorithm.

Item Type:Conference or Workshop Item (Paper)
Additional Information:This paper in available in : "35th European Symposium of the Working Party on Computer Aided Process Engineering, ESCAPE-12, 26-29 May, 2002, The Hague, The Netherlands. - Elsevier, 2002. - (Computer Aided Chemical Engineering, 10)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés Systèmes Industriels (PSI) - Conception Optimisation Ordonnancement des Procédés (COOP)
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Deposited By: Ludovic MONTASTRUC

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