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Modelling of a dynamic multiphase flash: the positive flash. Application to the calculation of ternary diagrams

Théry Hétreux, Raphaële and Llovell, Felix and Meyer, Xuân-Mi and Gerbaud, Vincent and Joulia, Xavier Modelling of a dynamic multiphase flash: the positive flash. Application to the calculation of ternary diagrams. (2004) Computers & Chemical Engineering, 2 (12). 2469-2480. ISSN 0098-1354

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Official URL: http://dx.doi.org/10.1016/j.compchemeng.2004.06.005


A general and polyvalent model for the dynamic simulation of a vapor, liquid, liquid-liquid, vapor-liquid or vapor-liquid-liquid stage is proposed. This model is based on the -method introduced as a minimization problem by Han & Rangaiah (1998) for steady-state simulation. They suggested modifying the mole fraction summation such that the same set of governing equations becomes valid for all phase regions. Thanks to judicious additional switch equations, the -formulation is extended to dynamic simulation and the minimization problem is transformed into a set of differential algebraic equations (DAE). Validation of the model consists in testing its capacity to overcome phase number changes and to be able to solve several problems with the same set of equations: calculation of heterogeneous residue curves, azeotropic points and distillation boundaries in ternary diagrams.

Item Type:Article
Additional Information:http://www.elsevier.com/wps/find/journaldescription.cws_home/349/description#description
HAL Id:hal-03602723
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés Systèmes Industriels (PSI)
Deposited On:20 Mar 2008 17:05

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