Mass transfer behavior of liquid–liquid slug flow in circular cross-section microchannel

Xu, Bujian; Cai, Wangfeng; Liu, Xiaolei; Zhang, Xubin

doi:10.1016/j.cherd.2013.01.014

Cited by 75 publications

(62 citation statements)

References 28 publications

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“…In order to realize even more efficient heat and mass transfer efficiency, some novel equipments with unconventional structure are observed in laboratory and industrial application. Circular cross-section [42] and square microchannels [39] are introduced to investigate the performance of liquid-liquid slug microflow. Some helically coiled tubes have also been proposed to enhance the mass transfer.…”

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confidence: 99%

Co and Ni extraction and separation in segmented micro-flow using a coiled flow inverter

Zhang

Hessel

Peng

et al. 2017

Chemical Engineering Journal

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The segmented micro-flow extraction and separation of the adjacent elements of Co from Ni sulphate solution with Cyanex 272 was developed using a micro-scale coiled flow inverter (CFI). This was compared with the conventional batch extraction at comparable conditions. Continuous operation of a process involving liquid-liquid extraction and then two-phase separation was achieved. For the latter a micro-scale separator was used. Compared with batch extraction, the segmented micro-flow extraction process showed by order-of-magnitude faster extraction times, higher extraction ability for Co, lower extraction for Ni, and then a better selectivity between Co and Ni for industrial-matching sulfate solutions with high Co and Ni ions concentration. In addition, flow patterns were recorded in the CFI by a high speed camera. Regular columnar slug flow was formed at low flow rates, and the length of the inlet slug was found to be a Gaussian function of the flow rates. In-and outlet flows matched, i.e. there was no change in the flow pattern when passing the CFI. At higher flow rates, deviations from the ideal pattern were found and in-and outlet flow did not match. Finally, the mass transfer coefficient in the range of 0.014 to 0.24 mm•s -1 was obtained.

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confidence: 99%

Co and Ni extraction and separation in segmented micro-flow using a coiled flow inverter

Zhang

Hessel

Peng

et al. 2017

Chemical Engineering Journal

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“…That is because the narrower the microchannel, the larger was the ratio of the interface area (between aqueous and organic phases) to the volume of the aqueous and organic phases, which can provide better mass transfer performance due to the higher mass transfer coefficient and volumetric mass transfer coefficient [26]. In addition, the extraction equilibrium was hardly achieved even with a very slow flow rate in the case of w = 800-1000 μm, while it was easily achieved in the narrow micro flow channel less than or equal to 100 μm (not shown).…”

Section: Effect Of Channel Width On the Extraction Efficiencymentioning

confidence: 99%

Solvent extraction of Nd(III) in a Y type microchannel with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

Zhang¹,

Xie²,

Li³

et al. 2015

Green Processing and Synthesis

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Conventional extraction equipment has many problems like a long mixing time, a large factory area occupation, a large amount of organic solvent consumption and so on. In this paper, a micro solvent extraction system for the extraction of Nd(III) was investigated to solve the above issues. The initial aqueous pH 4.0 and saponification rate 40% of 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) were selected as the optimal experimental conditions. The extraction equilibrium was quickly achieved within 1.5 s, without any mechanical mixing in a narrow channel (100 μm in width and 120 μm in depth) at a volumetric flow rate from 5.55 × 10 -10 m 3 /s to 1.53 × 10 -9 m 3 /s. The extraction behavior of Nd(III) in the microreactor is an interface chemical reaction or the diffusion rate of the Ndcomplex in the organic phase at low pH and [P507], while the extraction rate is controlled by the rate of metal diffusion in the aqueous phase at high pH and [P507], and the apparent mass transfer rate is up to 3.29 × 10 -5 mol/m 2 ·s. The extracted complexes are determined by the infrared (IR) spectrum method, and confirm that the extraction is via a cation exchange mechanism in the microreactor.

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“…In addition, they suggested that the volumetric mass transfer for the microchannel is likely to be higher than that for conventional reactors employing mixer-settlers, centrifugal extractors, and spray columns. In addition, Xu et al (2013) examined the mass transfer performance in the alkaline hydrolysis of n-butyl acetate, and found that the volumetric mass transfer coefficient for a circular cross-section microchannel was greater than that for an agitated contactor and a packed extraction column. They also expressed the volumetric mass transfer as a function of slug velocity.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Extraction and Separation of Cobalt and Lithium Ions Using a Slug Flow Microreactor

Hirayama

Hinoue

Tokumoto

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Due to the current widespread use of lithium-ion batteries in a range of applications, signi cant amounts of metalcontaining waste materials are generated. Typically, the recycling of transition metals from lithium-ion batteries involves leaching of Co 2 and Li from the LiCoO 2 anode and the electrolyte (e.g., LiPF 6 , LiBF 4 ). Thus, we herein examined the application of slug ow to the extraction of Co 2 and Li from an aqueous solution into an organic (cyclohexane) phase containing di-(2-ethylhexyl)phosphoric acid (D2EHPA) as the extraction reagent. The extraction equilibrium and extraction rate were then investigated to design a novel extraction process. In addition, a microchannel was employed to extract the Co 2 and Li ions from the aqueous phase. We found that the D2EHPA-Na solution (prepared from the partial exchange of H from D2EHPA with Na) was e ective for extracting Co 2 and, at a mole fraction of D2EHPA-Na >10%, complete Co 2 extraction from the aqueous phase was achieved. In addition, the presence of co-existing ions did not signi cantly a ect the extraction behavior of Co 2 and Li . Furthermore, the volumetric mass transfer coe cients (k L a) of Co 2 and Li exhibited the same order as those previously reported for other slug ow extraction systems. Finally, the ion concentration and selectivity were successfully simulated using the k L a values and the simulation results were in good agreement with experimental data. Such simulation of the Co 2 yield and purity is essential for selecting optimal process design conditions.

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Mass transfer behavior of liquid–liquid slug flow in circular cross-section microchannel

Cited by 75 publications

References 28 publications

Co and Ni extraction and separation in segmented micro-flow using a coiled flow inverter

Co and Ni extraction and separation in segmented micro-flow using a coiled flow inverter

Solvent extraction of Nd(III) in a Y type microchannel with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester

Liquid–Liquid Extraction and Separation of Cobalt and Lithium Ions Using a Slug Flow Microreactor

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