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Infrared imaging of temperature profiles in microreactors for fast and exothermic reactions

: Haber, J.; Kashid, Madhvanand; Borhani, N.; Thome, J.; Krtschil, Ulrich; Renken, A.; Kiwi-Minsker, L.


The chemical engineering journal 214 (2013), S.97-105
ISSN: 1385-8947
ISSN: 0300-9467
ISSN: 0923-0467
ISSN: 0009-2487
ISSN: 1873-3212 (Online)
Fraunhofer ICT-IMM ()
temperature profile; microreactor; infrared thermometry; exothermic reaction

Though microreactors provide high heat transfer rates, temperature profiles are formed in case of fast and highly exothermic reactions. A method based on non-intrusive infrared thermometry has been developed to track these profiles quantitatively with a resolution of 250 data points/cm2 and a precision of 1 °C. By placing the microreactor at a pressure of 10−2 mbar, convective heat losses are efficiently suppressed which assures well defined boundaries and reproducible results. The temperature profiles of the fast and exothermic hydrolysis of tetraethoxysilane were measured inside a microcapillary at different flow rates via infrared transparent window. In the reactor provided with a cooling system, the heat transfer coefficient was determined by thermal imaging for different operating conditions. The data obtained are in good agreement with the values reported in literature.