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Transient behavior and stability in miniaturized multiphase packed bed reactors / Nathalie Márquez in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1033–1040 Titre : Transient behavior and stability in miniaturized multiphase packed bed reactors Type de document : texte imprimé Auteurs : Nathalie Márquez, Auteur ; Pedro Castano, Auteur ; Jacob A. Moulijn †, Auteur Année de publication : 2010 Article en page(s) : pp. 1033–1040 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Transient--Behavior--Stability--Miniaturized--Multiphase--Reactors Résumé : The step response, including various startup procedures, in a three-phase microreactor of 2 mm internal diameter packed with nonporous particles of 100 μm is reported. We demonstrate that the bed behaves reproducibly through many cycles of operating conditions. Interestingly, we find that the different startup procedures have little effect on the steady state that is achieved. In other words, minimal hysteresis was observed, in sharp contrast to larger-scale reactors with larger particles where prewetting has a remarkable impact on the hydrodynamic behavior. The powder-packed beds have very high liquid saturation values, and prewetting is not needed. At least four liquid-residence times were needed to achieve stable pressure drop and dispersion values over the bed. This indicates that the hydrodynamic response into a stable operation may well be the limiting factor that determines the rate at which kinetic experiments can be performed in high-throughput equipment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900694r [article] Transient behavior and stability in miniaturized multiphase packed bed reactors [texte imprimé] / Nathalie Márquez, Auteur ; Pedro Castano, Auteur ; Jacob A. Moulijn †, Auteur . - 2010 . - pp. 1033–1040. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1033–1040 Mots-clés : Transient--Behavior--Stability--Miniaturized--Multiphase--Reactors Résumé : The step response, including various startup procedures, in a three-phase microreactor of 2 mm internal diameter packed with nonporous particles of 100 μm is reported. We demonstrate that the bed behaves reproducibly through many cycles of operating conditions. Interestingly, we find that the different startup procedures have little effect on the steady state that is achieved. In other words, minimal hysteresis was observed, in sharp contrast to larger-scale reactors with larger particles where prewetting has a remarkable impact on the hydrodynamic behavior. The powder-packed beds have very high liquid saturation values, and prewetting is not needed. At least four liquid-residence times were needed to achieve stable pressure drop and dispersion values over the bed. This indicates that the hydrodynamic response into a stable operation may well be the limiting factor that determines the rate at which kinetic experiments can be performed in high-throughput equipment. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900694r