Modeling and Simulation of Unsteady-state-operated Trickle-flow Reactors

Modeling and Simulation of Unsteady-state-operated Trickle-flow Reactors 

Copyright 2007 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim 

The experimental and simulation results of Liu et al. [16] showed also for a complex reaction system (2-ethylanthrahydroquione-hydrogenation) an improved trickle-bed reactor performance under unsteady-state-operation conditions. The selectivity of the consecutive reaction was increased up to 12% in comparison to steady-state conditions. 

In the following papers are presented further theoretical studies including used mathematical models of unsteady-state-operated TBRs [17-20]. Schubert [21] analyzed dynamic reactor models of recent years and presented a comparison of their useful applications for the simulation of periodically operated reactors. 

Generally, an improvement is attained if the time-average performance of the periodic operation is larger than that of the corresponding steady-state process. 

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I 4 Modeling and Simulation of Unsteady-state-operated Trickle-flow Reactors R radius, m... 

The developed dynamic reactor model for the simulation studies of the unsteady-state-operated trickle-flow reactor is based on an extended axial dispersion model to predict the overall reactor performance incorporating partial wetting. This heterogeneous model consists of unsteady-state mass and enthalpy balances of the reaction components within the gas, liquid and catalyst phase. The individual mass-transfer steps at a partially wetted catalyst particle are shown in Fig. 4.5. 

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