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Importance of Mass Transfer Fluctuations on Reaction Outcome in Multiphase Reactors

Mark J. McCready
Organization: University of Notre Dame
Department: Department of Chemical Engineering
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This notebook is intended to show how periodic fluctuations in the mass transfer coefficient can cause not only differences in the total conversion but differences in the selectivity of the products if the fluctuation frequency is of the correct order of magnitude. The intended application is gas-liquid reactions involving a solid phase catalyst such as trickle bed reactors.

A CSTR (Continuous flow Stirred Tank Reactor)model is used. First the model is demonstrated for a single phase reaction. Next a simple liquid-solid model is used. When fluctuations in the liquid-solid mass transfer coefficient are included, there is a change in selectivity with frequency. Finally the complete gas-liquid-solid model of Wu, McCready and Varma (1995) is done. This shows a maximum in selectivity at an intermediate frequency.

*Engineering > Chemical Engineering

Chemical reaction engineering, reaction selectivity, gas-liquid reaction, multiphase reactor, trickle-bed reactor, reactor dynamics
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Reaction_Selectivity_Mult.nb (2.1 MB) - Mathematica Package