Dragos-Nicolae STEFAN, Gheorghe MARIA<br>Derivation of Operating Region Runaway Boundaries for<br>the Vapour Phase Catalytic Reactor used for Aniline Production

Dragos-Nicolae STEFAN, Gheorghe MARIA
Derivation of Operating Region Runaway Boundaries for
the Vapour Phase Catalytic Reactor used for Aniline Production

Abstract:

The safety in operation of a fixed-bed catalytic reactor remains a sensitive issue when a highly exothermic reaction is conducted and various process development elements such as controllability, stability, risk, and economic aspects have to be considered. Nominal operating conditions are set at a certain distance from safety limits in order to control the hot spot in the tubular reactor and to avoid excessive thermal sensitivity to random variations in process parameters. In the present study, a robust and precise sensitivity criterion, i.e. the model-based z-MV generalized criterion of Morbidelli & Varma, is used to establish the runaway boundaries in the operating variable space. The method sets the global runaway conditions as corresponding to the maximum sensitivity of the temperature peak in the reactor vs. operating parameters. A concrete example is provided for the case of the fixed-bed catalytic reactor for aniline production. Because the process operating variables, such as the inlet temperature or fed ratio, inlet pressure, cooling agent temperature, etc., are subjected to random fluctuations within a certain range, confidence intervals of the derived process runaway boundaries are also predicted, to be further considered in the optimal location of the reactor set-point. Keywords: runaway boundaries, confidence region, catalytic reactor, aniline production

Issue: 2009, Volume 60, Issue 9

Pages:

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This article is published under the Creative Commons Attribution 4.0 International License

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