Journal
CHEMICAL ENGINEERING SCIENCE
Volume 226, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.115838
Keywords
Micro-reactor; Liquid-liquid mass transfer; Scale-up; T-mixer
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Funding
- National Natural Science Foundation of China [21706034]
- Project on the Integration of Industry, Education and Research of Fujian Province [2018Y4008]
- Guiding Project of Fujian Province [2018H0016]
- Open Foundation of State Key Laboratory of Chemical Engineering [SKL-ChE-18B02]
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To examine the scalability of a microreactor to the milli-scale, the liquid-liquid two-phase flow and mass transfer in a capillary reactor system were investigated. The flow pattern gradually transformed from a surface-force-controlled flow into a gravity-force-controlled flow with an increase of hydrodynamic diameter. In the T-mixer, the volumetric mass-transfer coefficient decreased and increased with an increase in the capillary diameter at low and high superficial liquid velocities, respectively. Because of the different mass-transfer mechanisms in the T-mixer and capillary, this scale-up effect became weaker in the capillary reactor system, particularly at a high superficial liquid velocity. A minimum 18% of mass was transferred in the T-mixer even at the milli-scale, suggesting the significant contribution of the T-mixer to mass transfer in the capillary reactor system. Empirical equations for predicting the volumetric mass-transfer coefficient of the T-mixer and the capillary reactor system in the hydrodynamic diameter range of 0.8-3.0 mm were formulated. (C) 2020 Elsevier Ltd. All rights reserved.
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