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All Journal International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Yadir, Said
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Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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New Modeling Approaches for Ethylene Oxychlorination in Fluidized Bed Reactors: Industrial and Low Flow Rate Conditions El Bazi, Wail; Bideq, Mustapha; El-Abidi, Abderrahim; Yadir, Said
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 2 Year 2024 (August 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20148

Abstract

A simple model (Continuous Stirred-Tank Reactor) has been developed to predict the behavior of industrial ethylene oxychlorination fluidized beds operating in a turbulent regime. The approach showed good agreement both with results from industrial reactors and with those corresponding to the (Simple two phases-Plug bubble-Mixed flow emulsion approach) validated in the literature. For low flow rates, the use of the (Simple two phases - Plug bubble - Plug emulsion model) adapted to these conditions enabled us to highlight the location and extent of undesirable thermal hot spots for the process, and to propose actions to control them by acting on the temperature and/or on the feed gas flows. By comparing this model with the plug approach, the significant slowdown in ethylene conversion caused by resistance to mass transfer when feed flow rates are low is highlighted. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Advanced one-dimensional heterogeneous model for high temperature water gas shift membrane reactors El Bazi, Wail; El-Abidi, Abderrahim; Yadir, Said; Messnaoui, Brahim
International Journal of Renewable Energy Development Vol 14, No 5 (2025): September 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.61222

Abstract

To predict the behavior of small-scale WGS membrane reactors, a new model based on the 1D heterogeneous approach was developed. Unlike most studies, which rely on 1D pseudo-homogeneous models—typically limited to reactors filled with small catalyst particles which are prone to misestimating catalytic effectiveness when larger catalyst grains are used in which mass transfer resistance is usually considered only within the dense membrane layer which a valid assumption only when this layer is thick, the proposed model adapts to a wide range of catalyst sizes and geometries and also accounts for resistance in the porous stainless steel support of the membrane. This makes it suitable when the dense layer is thin.Comparison with experimental data under various conditions validated the model’s ability to predict the behavior of reactors packed with large catalyst particles (Vgrain ≈ 169 mm³). Therefore, the developed 1D heterogeneous model accurately predicts membrane reactor behavior without resorting to more complex 2D models. Simulations highlighted the significant influence of particle geometry on the catalyst effectiveness factor throughout the reactor, while its impact on carbon monoxide conversion, hydrogen partial pressure, and the temperature profile is especially pronounced near the reactor inlet. Additionally, results showed that sweep gas use accelerates the reaction and aids hydrogen permeation. Finally, CO conversion in the membrane reactor reached 1.3 times that of a conventional fixed-bed reactor.
Co-Authors Bideq, Mustapha El Bazi, Wail El-Abidi, Abderrahim Messnaoui, Brahim