263633 The Microdroplet Generation in Supercritical CO2 by a High Pressure Microfluidic Device

Monday, October 29, 2012
Hall B (Convention Center )
Kang Qin, Kai Wang, Tao Wang and Guangsheng Luo, State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, China

The microdroplet generation in supercritical CO2 by a high pressure microfluidic device *


Kang Qin1, Kai Wang2, Tao Wang3, Guangsheng Luo

The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

The biphasic system constituted with supercritical carbon dioxide (ScCO2) and another liquid phase, has some unique characters in the chemical reaction and separation processes, as well as its strong ability to couple reaction and separation in one integrated process. To increase the mass transfer rate between the ScCO2 phase and the liquid phase, the microdispersion processes of several ScCO2/liquid systems are investigated in this study with a high pressure T-junction microfluidic device.  The visible microfluidic device with an online high-speed camera imaging system can withstand a pressure of 25MPa and the generations of water and ionic liquid droplets in ScCO2 are experimentally studied.  The effects of pressure, temperature and dispersion method on the two-phase flow pattern and the dispersion size of droplets are discussed and a model equation is established for the microdispersion process in ScCO2/liquid systems. Comparisons between droplet generation processes in ScCO2, liquid CO2 and gaseous CO2 are also made for understanding the characters of microdispersed ScCO2/liquid systems. The differences of microdispersion of unsaturated and saturated liquid with CO2 were observed. 


Key words: supercritical carbon dioxide; biphasic system; droplet generation; microfluidic; T-junction microchannel



* Supported by National Science Foundation of China (21076111)

1 Presenter, qin-k10@mails.tsinghua.edu.cn

2 Corresponding author, kaiwang@tsinghua.edu.cn

3 Corresponding author, taowang@tsinghua.edu.cn

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