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Prediction of the effectiveness factor and selectivity for highly exothermic reactions

✍ Scribed by C. McGreavy; J.M. Thornton

Publisher: Elsevier Science
Year: 1970
Tongue: English
Weight: 442 KB
Volume: 25
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(70)80024-0

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✦ Synopsis

Ah&&-The need to produce a simple but accurate model for determining the effectiveness factors and selectivities for complex reaction schemes has led many authors to make convenient but arbitrary simplifying assumptions in the formulation of their models. No systematic evaluation of these assumptions has been made, so no general conclusions are available as to the reliability of the various approximations.

The most common simplifications are examined in detail, by applying them to a system of highly exothermic consecutive and parallel reactions. It is shown that, for the practical range of system parameters, a lumped thermal resistance model with external film resistance gives a very good approximation to the fully distributed model, enabling the effectiveness factor and selectivity to be obtained by the solution of an algebraic equation. Considerable savings in computation time result, and diffiiculties in the numerical solution, usual with problems of this kind, are avoided.

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