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Étude hydrodynamique et modélisation des réacteurs à gazosiphon d'oxydation du cumène

Abstract : A complete model for prediction of cumene oxidation air-Iift reactors has been developed. The model includes reaction kinetics, mass transfer and hydrodynamics. The film model has been chosen to account for an eventual enhancement of the oxygen absorption rate. The flow configuration has been taken into account and the cell model approach is used to describe the liquid and gas phase mixing behavior. Hydrodynamic parameters as the gas hold-up and the liquid circulation velocity, are calculated with an adequate model based on momentum balance equations and adjusted to the industrial system with experimental data. Experimental work involving numerous measuring techniques has been conducted in several reactors (one simple bubble column and three air-lift reactors) equipped with different gas distributors and using water, water-alcohol solutions and the industrial organic mixture as the liquid phase. A better understanding of the influence of liquid properties (particularly the coalescing behavior) and of the gas distribution on bubble and hydrodynamic characteristics has been obtained. Flow regimes and regime transitions have also been examined using different techniques of signal analysis applied to pressure fluctuations. Finally, the complete model predicts the variations of concentration and hydrodynamic parameters along the reactor and so is able to provide a good description of the cumene oxidation reactors. By performing parameter sensitivity analysis and by incorporating the model into an optimization procedure, guidelines for design, operation and scale-up of such reactors are proposed.
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Submitted on : Thursday, March 29, 2018 - 12:47:05 PM
Last modification on : Friday, February 26, 2021 - 3:36:03 PM

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  • HAL Id : tel-01750478, version 1



Eric Camarasa. Étude hydrodynamique et modélisation des réacteurs à gazosiphon d'oxydation du cumène. Autre. Institut National Polytechnique de Lorraine, 2000. Français. ⟨NNT : 2000INPL080N⟩. ⟨tel-01750478⟩



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