Title:
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Using CFD to estimate external mass transfer coefficients and intra-particle diffusional effects on the supercritical hydrogenation of sunflower oil
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Author:
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Guardo Zabaleta, Alfredo de Jesús; Ramírez Rangel, Eliana; Larrayoz Iriarte, María Angeles; Recasens Baxarías, Francisco Javier
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids; Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. FLUIDS - Enginyeria de Fluids |
Abstract:
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Hydrogenation of vegetable oils is an important process in the food industry
because of its widespread application to produce margarines, shortenings, and other
food components. Supercritical technology has proven to be a reliable alternative to
conventional hydrogenation process because not only the trans isomer levels can be
reduced, but also offers a clean, economic and environmental friendly process.
Computational Fluid Dynamics (CFD) modeling applied to the supercritical hydrogenation reaction can be useful in visualizing and understanding the mass transfer phenomena involved. CFD is applied to the study of the catalytic hydrogenation of sunflower oil in the presence of a supercritical solvent. A mix of sunflower oil, hydrogen and supercritical propane (used as a solvent) is the flowing fluid. Their transport properties at high pressure are incorporated within a CFD commercial code in order to estimate them online within the simulation process. A 2D CFD model of a single Pd-based catalyst pellet is presented. Intra-particle and surface concentration profiles and surface mass fluxes for all species present in the mixture (oil triglycerides and hydrogen) are obtained and compared against experimental results. Different temperatures, flow velocities and particle sizes are studied and external and internal
mass transfer phenomena are analyzed. External mass transfer coefficients for hydrogen and oil triglycerides are obtained and a correlation for estimating them is presented. |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria química::Indústries químiques::Olis i greixos industrials -Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids -Hydrogenation -Hidrogenació |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Book Part |
Published by:
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Bentham Science Publishers
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