Etude d un réacteur chimique structuré de type échangeur à plaques hautes performances à l aide d un modèle à compartiments détaillé :

Abstract : The implementation of exothermic chemical reactions is strongly limited by the dissipation of the heat generated. Because of this, a new concept of structured heat exchanger reactor has been developed by Alfa Laval. This reactor is named OPR (Open Plate Reactor). This reactor is based on high performances heat plate exchanger in which small inserts allow a good mixing of the reactants. Moreover the reactants may be injected in several points whereas numerous configurations allow to alternate co-current and counter-current flows between reactive fluid and cooling fluid depending on the needs. Residence Time Distribution (RTD) experiments have been carried out to characterize the fluid behaviour. The experiments have been conducted in a large range of operating flow-rates and for several viscosities. The flow behaviour has been modelled by the perfect mixing cells in series exchanging with a stagnant zone. The time of exchanging and the volume of the stagnant zone have been precisely estimated as a function of viscosities and flow-rates. The heat and mass balances have been added into this model in order to simulate three chemical reactions in homogeneous liquid medium for which the kinetic s is well known : Alkaline hydrolysis of ethyl acetate, Alkaline hydrolysis of ethylene glycol diacetate, Oxidation of sodium thiosulphate by hydrogen peroxide. A reasonable agreement has been found between experimental results and simulations both for productivity and selectivity of the reactions. For the exothermic reaction the experimental and simulated temperature profiles have been compared. The model gives a reasonable representation except under certain conditions for which the amplitude of the hot point is over estimated. This difference provides that the axial conduction in the solid is not taken into account in the model. The model has been used to study the behaviour of the reactor for several configurations for which experimental results are not still available. Moreover a new concept of compartmental model has been developed to simulate the results obtained with reaction tests for micro mixing evaluation of the reactant s inlet.
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Mahvand Vafaei Alamdari. Etude d un réacteur chimique structuré de type échangeur à plaques hautes performances à l aide d un modèle à compartiments détaillé :. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL023N⟩. ⟨tel-01752543⟩

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