Liquid-liquid microextraction in a rotating microchannel extractor

Ma, Rui; Fan, Chunxin; Wang, Yubin; Jian, Luo; Li, Jun; Ji, Yuzhu

doi:10.1016/j.cep.2020.107916

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The volume of fluid method (VOF) is used to model the two-phase interface. The transient simulation uses the explicit VOF method, and the time step of the volume fraction equation is limited by the maximum Courant number 7 . The multi-reference Frame (MRF) model is used to model the device, that is, the microchannel is divided into two areas, one is the area a near the inner rotor, the other is the area b near the acrylic outer cylinder.…”

Section: Cfd Simulation Of Flow Patternmentioning

confidence: 99%

“…5,6 It is widely used in chemical, metallurgy, and other fields. 7 The separation techniques based on solvent extraction have been widely used to produce high-purity single rare earth solutions or compounds. 8 However, the conventional equipment like stirring contactors, 9 packed extraction columns, 10 packed bed columns, 11 mixing settlers, 12 etc.…”

Section: Introductionmentioning

confidence: 99%

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Microextraction of lanthanum using a rotating microchannel extractor

Chen

Fan

et al. 2022

JSCS

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This work introduced a novel microchannel extractor. The extraction system was to extract lanthanum nitrate aqueous solution with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (EHEHPA). Different feeding methods and inner rotors were explored first. The results showed that parallel feeding and inner rotors engraved with spiral stripes were more favorable for extraction. Next, the effect of various factors on the extraction was explored, including the pH of the aqueous phase, rotational inner rotor speed (R) and the fluid volumetric flow rate (Q). The results showed that these factors are closely related to the extraction. Finally, the experiment was verified by CFD numerical simulation, the simulation result was consistent with the experiment. In this device, active mixing was introduced into the microchannel extraction, which significantly improved the extraction efficiency. Under certain conditions, the extraction efficiency of this device exceeded stirring extraction equilibrium. Moreover, the extraction in this device is faster than conventional stirring extraction. These advantages provide a possibility for highly efficient extraction and use of rare earth elements.

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Section: Cfd Simulation Of Flow Patternmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microextraction of lanthanum using a rotating microchannel extractor

Chen

Fan

et al. 2022

JSCS

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“…Through that movement, the organic phase and aqueous phase were mixed and flow out of the RME from the middle outlet of the equipment, and the gas phase flowed out from the gap in the upper part of the cylinder after disturbing the liquid flow in the microchannel; thus, the countercurrent movement is formed. [39] At this time, reducing the feed flow will undoubtedly increase the contact residence time of fluid. In the channel, the SD-SDF of gas-liquid-liquid three-phase flow is formed driven by the interfacial tension and centrifugal force (Figure 7A).…”

Section: Effect Of Rotation Rate On Small Droplet Flowmentioning

confidence: 99%

Gas‐liquid‐liquid flow patterns and extraction in a rotating microchannel extractor

Fan

Wang

et al. 2021

Can J Chem Eng

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The flow patterns of gas-liquid-liquid three-phase fluids in the rotating microchannel extractor (RME) were studied in this paper. The kerosene-water system without mass transfer and the 2%P507-22%NaH 2 PO 4 system with mass transfer were considered. The influence of interfacial tension, microchannel structure, and rotation rate on three-phase flow patterns were investigated. Eight different flow patterns such as droplet-continuous flow, long dropletcontinuous flow, filiform parallel-continuous flow, filiform parallel-filiform parallel flow, small droplet-continuous flow, filiform parallel-small droplet flow, small droplet-small droplet flow, and continuous-filiform parallel flow were observed. The results showed that the proposed universal flow pattern map can effectively predict the flow patterns of the two systems and the small droplet-small droplet flow has the best effect of extracting Fe 3+ from the 2%P507-22%NaH 2 PO 4 system. The traditional first-order equilibrium extraction efficiency was 102% while the percentage extraction was up to 85% (14.4 mg/L) after one stage extraction and about 97.9% (2.0 mg/L) after twostage extraction. K E Y W O R D S ferric(III) ion, gas-liquid-liquid flow, mass transfer, rotating microchannel extractor

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Liquid–liquid flow characteristics and mass transfer enhancement in a Taylor–Couette microreactor

Zeng,

Wang,

et al. 2024

AIChE Journal

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The liquid–liquid immiscible flow and mass transfer were investigated in a novel Taylor–Couette microreactor (TCMR). Due to the rotation shear and microscale effects, each phase flowed in the form of helical strips/bands, instead of dispersion droplets as in conventional equipment. Based on the movement and inclination of the bands, the helical vortex (HV), mixed helical vortex (MHV) and stationary helical vortex (SHV) were distinguished. The characteristics of the regimes were strongly influenced by rotation speed and flow rate, but the specific surface area only slightly varied. The flow regimes also influenced the two phase mass transfer. It was shown that the mass transfer coefficient kLa monotonically increased with the rotation speed in the HV regime, while it slightly decreased when the flow shifted into the MHV/SHV regime. According to the parametric studies, empirical correlations were developed for the flow regime transition and mass transfer prediction.

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Liquid-liquid microextraction in a rotating microchannel extractor

Cited by 8 publications

References 38 publications

Microextraction of lanthanum using a rotating microchannel extractor

Microextraction of lanthanum using a rotating microchannel extractor

Gas‐liquid‐liquid flow patterns and extraction in a rotating microchannel extractor

Liquid–liquid flow characteristics and mass transfer enhancement in a Taylor–Couette microreactor

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