Segmented Microflows as a Tool for Optimization of Mass Transfer in Liquid−Liquid Extraction: Application at the Extraction of Europium(III) by a Malonamide,Industrial & Engineering Chemistry Research

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Segmented Microflows as a Tool for Optimization of Mass Transfer in Liquid−Liquid Extraction: Application at the Extraction of Europium(III) by a Malonamide
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-20 , DOI: 10.1021/acs.iecr.8b02079
Axel Vansteene ₁ , Jean-Philippe Jasmin ₁ , Gérard Cote ₂ , Clarisse Mariet ₁

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Segmented flows in T-junction glass microchannels are investigated as a tool for the study of liquid–liquid extraction kinetics of europium(III) by a malonamide. They allow to reach higher extraction yields compared with laminar flows, for a same extraction system. After the range of volume ratio reached in microsystems and the thickness of the organic film between the aqueous plugs and the microchannel walls are determined, the extraction yields in microsystems and at equilibrium are compared. A definition of a pseudokinetic coefficient, K, is proposed, as a lower bound limit for the chemical forward coefficient k_f. The evolution of this pseudokinetic coefficient is investigated as a function of the droplet velocity, and the diffusion-limited regime is identified. A model for the evolution of K is then proposed and the maximum value for K, reached for a velocity of the droplets over 20 cm s^–1, is compared with literature values.

中文翻译：

细分的微流作为在液-液萃取中优化传质的工具：丙二酰胺在at（III）萃取中的应用

研究了T型结玻璃微通道中的分段流动，作为研究丙二酰胺对euro（III）进行液-液萃取动力学的工具。对于相同的萃取系统，与层流相比，它们可以实现更高的萃取产量。确定了在微系统中达到的体积比范围并确定了水塞和微通道壁之间的有机膜厚度后，比较了在微系统中和处于平衡状态时的萃取率。提出了拟动力学系数K的定义，作为化学正向系数k _f的下限。研究该伪动力学系数随液滴速度的变化，并确定了扩散受限机制。然后提出了K的演化模型，并将液滴在20 cm s ^–1上的速度达到的K最大值与文献值进行比较。

更新日期：2018-08-20

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