A high-power ultrasonic microreactor and its application in gas–liquid mass transfer intensification

Lab on a Chip ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 1145-1152 ◽  
Author(s):  
Zhengya Dong ◽  
Chaoqun Yao ◽  
Xiaoli Zhang ◽  
Jie Xu ◽  
Guangwen Chen ◽  
...  
Keyword(s):  
Mass Transfer ◽  
High Power ◽  
Slug Flow ◽  
Liquid Mass ◽  
Half Wavelength ◽  
Flow Surface ◽  
Power Ultrasonic ◽  
Liquid Mass Transfer ◽  
Overall Mass Transfer Coefficient ◽  
Mass Transfer Intensification

A robust high-power ultrasonic microreactor vibrating as a half wavelength resonator was designed and applied to intensify gas-liquid mass transfer of slug flow. Surface wave oscillation of the bubbles was excited, enhancing the overall mass transfer coefficient by 3.3–5.7 times

Two-Phase Flow and Mass Transfer in Helical Capillary Flow Reactors With Alternating Bends

2015 ◽  
Author(s):  
Safa Kutup Kurt ◽  
Krishna Deo Prasad Nigam ◽  
Norbert Kockmann
Keyword(s):  
Mass Transfer ◽  
Slug Flow ◽  
Extraction Efficiency ◽  
Capillary Flow ◽  
Volumetric Flow Rate ◽  
Two Phase ◽  
Flow Reactors ◽  
Liquid Mass ◽  
Reactor Geometry ◽  
Liquid Mass Transfer

Microstructured devices have gained much attention in R&D and industry as they offer large specific surface area with enhanced mass and heat transfer. Helically coiled tubular devices in micro-scale can further increase the performance in terms of transport phenomena, as secondary flow (Dean vortices) enhances the radial mixing along the tube. In the content of this work liquid-liquid mass transfer of different helical capillary flow reactors was investigated and compared with straight capillaries by using water/acetone/butyl acetate test systems for liquid extraction. Helically flow capillary reactors with alternating bends and straight capillaries were fabricated by using FEP tubes (fluorinated ethylene propylene) with inner diameter of 1 mm. Slug flow was introduced within the reactors by utilizing T-shaped mixing elements at the inlet. In order to obtain robust and precise downstream analyses, a continuously working, in-line phase splitter was fabricated and connected to the outlets of the reactors. It instantaneously splits the organic and aqueous phases depending on their wettability characteristics. Total volumetric flow rate was varied in the range of 1–8 mL min−1 and volumetric flow ratios (aq/org) in the range of 0.5–2.0. Effects of contact time, volumetric flow ratio, and the reactor geometry on extraction efficiency were investigated for the experiments at ambient temperature by generating slug flow patterns. Experimental results revealed that the helical capillary flow reactors offer higher extraction efficiency up to 20 % compared to straight capillaries at constant contact times. Hence, these types of reactors can be applied for liquid-liquid mass transfer processes, which require longer residence time due to slow mass transfer rates.

scholarly journals CFD studies coupling hydrodynamics and solid‐liquid mass transfer in slug flow for matter removal from tube walls

AIChE Journal ◽  
2016 ◽  
Vol 63 (6) ◽  
pp. 2420-2439 ◽  
Author(s):  
Mónica C. F. Silva ◽  
José D. P. Araújo ◽  
João B. L. M. Campos
Keyword(s):  
Mass Transfer ◽  
Slug Flow ◽  
Liquid Mass ◽  
Liquid Mass Transfer ◽  
Solid Liquid

Enhancement of formic acid production from CO2 in formate dehydrogenase reaction using nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 109978-109982 ◽  
Author(s):  
Young-Kee Kim ◽  
Sung-Yeob Lee ◽  
Byung-Keun Oh
Keyword(s):  
Mass Transfer ◽  
Formic Acid ◽  
Acid Production ◽  
Transfer Rate ◽  
Formate Dehydrogenase ◽  
Mass Transfer Rate ◽  
Liquid Mass ◽  
Dehydrogenase Reaction ◽  
Liquid Mass Transfer ◽  
Mesoporous Nanoparticles

In an enzyme process using a gas substrate, the enhanced gas liquid mass transfer rate of the gas substrate by methyl-functionalized mesoporous nanoparticles could improve the productivity.

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