Research progress on micro-scale internal liquid-liquid mass transfer and reaction process enhancement

doi:10.11949/0438-1157.20201114

Abstract

Abstract:

Micro-chemical technology has been widely used as an efficient process intensification technology. This paper starts with the coupling mechanism among hydrodynamics, transport and reaction, and reviews the latest progress and development of research on characteristics of hydrodynamics and mass transfer for liquid-liquid systems at microscale, various types of microreactors with mass transfer process intensification, its evaluation criteria, and relevant applications on synthesis of chemicalsand materials. Finally, future development of microchemical technology regarding liquid-liquid two-phase systems is envisaged.

Key words: microscale, microreactor, microchemical technology, two-phase flow, process intensification, mass transfer

摘要：

微化工技术作为一种高效的过程强化技术获得了广泛应用。本文从流动、传递及反应三者之间的耦合机制出发，系统综述了近十五年以来关于微尺度内液-液两相流动与传质过程特征、强化传质的微反应器、评价标准及其在化学品合成与材料制备中的应用等方面的研究进展，并对其未来发展方向进行了展望。

关键词: 微尺度, 微反应器, 微化工技术, 两相流动, 过程强化, 质量传递

CLC Number:

TQ 052

LI Guangxiao,LIU Sai'er,SU Yuanhai. Research progress on micro-scale internal liquid-liquid mass transfer and reaction process enhancement[J]. CIESC Journal, 2021, 72(1): 452-467.

李光晓,刘塞尔,苏远海. 微尺度内液-液传质及反应过程强化的研究进展[J]. 化工学报, 2021, 72(1): 452-467.

Figures/Tables 8

Fig.1 Flow patterns of liquid-liquid two phases at microscale[5-7, 9-10]Flow pattern formation stage: (a) slug flow, (b) monodispersed droplet flow, (c) droplet populations flow, (d) jetting flow, (e) annular flow, (f) parallel flow with smooth interface, (g) parallel flow with wavy interface, (h) chaotic thin striations flow; Flow patterns in steady stage: (i) slug flow, (j) monodispersed droplet flow, (k) droplet populations flow, (l) parallel flow, (m) annular flow, (n) slug-dispersed flow, (o) droplet-dispersed flow, (p) annular-dispersed flow

Fig.2 Typical liquid-liquid flow pattern maps at the microscale[5, 9, 22-23]

Fig.3 Volumetric mass transfer coefficients in different scaled reactors[4, 27-29]

Fig.4 Acoustic induced emulsification effect in ultrasonic microreactors[62, 70]

Fig.5 Typical microsieve dispersion microreactors[4, 72-73]

Fig.6 Typical microreactors with mass transfer intensification through packing baffles or barriers[29, 81-83]

Fig.7 Microreactors with mass transfer intensification by gas agitation[27, 86]

Fig.8 Overall volumetric mass transfer coefficient as a function of the specific energy dissipation for different microreactors with mass transfer intensification[29, 70, 79]

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