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Issue 5, 2017
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Local and overall heat transfer of exothermic reactions in microreactor systems

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Abstract

Non-reactive and reactive heat transfer experiments were performed in the FlowPlate® system manufactured by Ehrfeld Mikrotechnik, which is composed of alternating reactor and heat transfer fluid plates within a rack. The non-reactive model system studied a rectangular serpentine channel with Reynolds numbers ranging from 400–2000, and a Gnielinski-type model was fit to the internal Nusselt number. A silver-based thermal paste was shown to reduce the external resistance to heat transfer between the reactor and heat transfer fluid plates by ∼70%, leading to overall heat transfer coefficients of ∼2200 W m−2 K−1. In the reactive system, the synthesis of methyl 2-oxobutanoate, using dimethyl-oxalate and the Grignard reagent ethylmagnesium chloride, was highlighted as a test reaction to differentiate localized heat transfer characteristics across different reactors. The Grignard reaction was used to compare the impact of various micro-mixer geometries, materials, injection ports, and scales on hotspot formation in the reactors. Finally, an analysis of four case studies that can be extended to any micro-reactor system with known overall heat transfer coefficients was presented using the fourth Damköhler number to determine a maximum channel diameter that would remove energy sufficiently quick to avoid hotspot formation.

Graphical abstract: Local and overall heat transfer of exothermic reactions in microreactor systems

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Publication details

The article was received on 13 Jun 2017, accepted on 29 Aug 2017 and first published on 05 Sep 2017


Article type: Paper
DOI: 10.1039/C7RE00085E
Citation: React. Chem. Eng., 2017,2, 763-775
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    Local and overall heat transfer of exothermic reactions in microreactor systems

    E. Mielke, P. Plouffe, N. Koushik, M. Eyholzer, M. Gottsponer, N. Kockmann, A. Macchi and D. M. Roberge, React. Chem. Eng., 2017, 2, 763
    DOI: 10.1039/C7RE00085E

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