A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system

A new system combining a microreactor and a microcalorimetric chip was investigated. The small size of the microreactor channel permits maintaining isothermal conditions necessary for the kinetic characterization of highly exothermic reactions. These conditions are not easily obtained in classical c...

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Bibliographic Details
Published in:Chemical engineering journal (1996) 2004-08, Vol.101 (1), p.241-250
Main Authors: Schneider, M.-A., Maeder, T., Ryser, P., Stoessel, F.
Format: Article
Language:English
Subjects:
Applied sciences
Calorimetric system
Chemical engineering
Exact sciences and technology
Exothermic reactions
Microchannel
Microreactor
Reactors
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Summary:A new system combining a microreactor and a microcalorimetric chip was investigated. The small size of the microreactor channel permits maintaining isothermal conditions necessary for the kinetic characterization of highly exothermic reactions. These conditions are not easily obtained in classical calorimetric systems. The degree of mixing in the microchannel, which plays an important role for the characterization of fast reactions, was determined experimentally using an iodate–iodide system and confirmed by calculations. The calorimetric system was calibrated by performing the neutralization reaction of NaOH with H 2SO 4 in the microchannel. Several optimizations of the microreactor design allowed to raise the sensitivity of the system and to preheat the entering fluids. The results obtained were repeatable and reproducible. The establishment of the heat balance and the evaluation of the various resistances allowed a better global understanding of the system.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2003.11.005