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This work has been undertaken with the main purpose of developing an intrinsic criterion that would allow the prevention of thermal runaway for any process carried out in discontinuous reactors. Current criteria for designing safe discontinuous processes are defined for a specific kinetics scheme, and the extension to other reacting systems is not clearly defined. The generalized parametric sensitivity criteria have been applied to the prevention of thermal runaway in batch processes. Theoretical results have been verified experimentally and have been compared with the results obtained using a conventional criterion. The parametric sensitivity analysis applied to semibatch processes has shown that the criterion discerns between nonignition and thermal runaway regions. However, the optimal parametric regions for operating a semibatch process, called Quick onset, Fair conversion, Smooth temperature profile (QFS) cannot be distinguished for runaway regions using the parametric sensitivity criterion. A new intrinsic and generalized criterion of QFS conditions, based on the earliest ignition time of the process, is presented in this work. The results have been verified experimentally in a bench scale laboratory reactor and in a pilot plant reactor. Finally, a new intrinsic method, based on the local Lyapunov exponents has been proposed for semibatch processes.

Additional information

Authors: ALÓS M A, JRC Ispra (IT);ZALDÍVAR J M, JRC Ispra (IT);NOMEN R, IQS, Barcelona (ES)
Bibliographic Reference: EUR 17275 EN (1996) 115pp., FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT), Fax: +39-332-785818
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