Research on flow behavior of liquid-phase precipitation reaction in the tubular microchannel reactor

被引：0
作者：
Yao H. [1 ]
Xin Z. [1 ,2 ]
机构：
[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai
[2] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 08期
关键词：
agglomeration; clogging mechanism; flow; precipitation; reactors; rheology; suspensions; viscosity;
D O I：
10.11949/0438-1157.20220609
中图分类号：
学科分类号：
摘要：
With the aqueous-phase synthesis of calcium carbonate (CaCO3) as the model reaction and based on the magnifying observation of flow-reaction process, the flow behavior characteristics of liquid-phase precipitation reaction in the milli-scale tubular microchannel and the mechanism of channel clogging were analyzed from the rheological properties of the suspension. The results showed that the viscosity of CaCO3-water suspension increased sharply with the increase of solid content at low shear rate and the nature of clogging could be attributed to the formation of local high viscosity area with high solid content on the wall and in the bulk flow, which made the fluidity seriously deteriorate. Increasing the flow rate of the reaction accelerated the formation of sedimentary layer and precipitation particle aggregates, thus the clogging was accelerated. The formation of aggregates was much faster than the accumulation of sedimentary layer, making“bridging”of aggregates the main factor of channel clogging. Based on the local high-viscosity region that destroys the flow wall and main body, two new microchannel reactor models are designed, which may provide new ideas for solving the problem of clogging of the reaction channel. © 2022 Materials China.
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页码：3518 / 3528
页数：10
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