首页|Assessing mixing uniformity in microreactors via in-line spectroscopy

Assessing mixing uniformity in microreactors via in-line spectroscopy

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Mixing behavior is critical for enhancing the selectivity of fast chemical reactions in microreactors.A high Reynolds number(Re)improves the mixing rate and selectivity of the reactions,but some exceptions of increasing side product yield with the higher Re have been reported.This study investigated the mixing uniformity in microreactors with in-line UV-vis spectroscopy to clarify the relationship between reac-tion selectivity and chaotic mixing with the higher Re.A colorization experiment of thymolphthalein in an acidic solution was conducted with an excess acid amount to the base to indicate a non-uniformly mixed region.Non-uniformity significantly increased with Re.At the same time,the degree of mixing,which was measured by a usual decolorization experiment,showed that the mixing rate increased with Re.The in-line analysis of the Villermaux-Dushman reaction during the mixing clarified that side product yield significantly increased with Re at around 300 and then decreased at around 1100.These results suggest the compensation effect between the mixing uniformity and mixing rate on the selec-tivity of the mixing-sensitive reactions.Faster mixing,characterized by a larger Re,can disturb mixing uniformity and,in some cases,decrease reaction selectivity.

MicroreactorVillermaux-Dushman reactionIn-line analysisMixingMass transferUniformity

Shusaku Asano、Shinji Kudo、Taisuke Maki、Yosuke Muranaka、Kazuhiro Mae、Jun-ichiro Hayashi

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Institute for Materials Chemistry and Engineering,Kyushu University,Kasuga 816-8580,Japan

Department of Chemical Engineering,Graduate School of Engineering,Kyoto University,Japan

support of JSPS KAKENHICooperative Research Program of the Network Joint Research Center for Materials and DevicesMinistry of Education,Culture,Sports,Science,and Technology(MEXT),JapanAUN/SEED-Net

21H05083BUU REd-UC 2301

2024

10.1016/j.cjche.2023.09.009

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.66(2)
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