Towards a comprehensive model for liquid flow modulation in trickle bed reactors

The response of an isothermal TBR to a liquid flow modulation ON–OFF strategy is examined through a model aimed at the reactor scale. The reaction is gas-limited and first order with respect to both reactants. Liquid hydrodynamic behavior is considered by means of two different approaches: the Liqui...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2009-11, Vol.154 (1), p.162-167
Main Authors: Ayude, María A., Haure, Patricia M., Martínez, Osvaldo M., Cassanello, Miryan C.
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Conversion
Drainage
Hydrodynamics
Liquid flow modulation
Liquids
Mathematical analysis
Mathematical models
Modeling at the reactor scale
Modulation
Reactors
Trickle bed reactors
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Summary:The response of an isothermal TBR to a liquid flow modulation ON–OFF strategy is examined through a model aimed at the reactor scale. The reaction is gas-limited and first order with respect to both reactants. Liquid hydrodynamic behavior is considered by means of two different approaches: the Liquid Draining Approach, based on experimental results and the ideal, Square Wave Approach. Model allows the evaluation of, among other variables, the liquid holdup, the liquid velocity and the liquid reactant conversion time variations at different axial positions within the reactor. An enhancement factor due to periodic operation is defined by computing a temporal average of the liquid reactant conversion during an invariant cycling state, referred to its corresponding steady-state conversion. For all the conditions investigated, attainable enhancements are lower when the actual draining model is assumed.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2009.03.042