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Liquid-liquid extraction of two radiochemical systems at micro-scale predict and achieve segmented flow to optimize mass transfer

Abstract : One of the most important separation techniques in radiochemical procedures is solvent extraction. In the last decade, a growing interest in its use in microsystems with multiphase micro-flows has emerged because such systems allow a good control of the interface area between aqueous and organic phases as well as of the contact time of the two phases.A previous study was devoted to the micro-extraction in parallel flows of uranium in chloride media by Aliquat 336 and europium in nitric acid by the N,N'-dimethyl N,N'-dibutyl tetradecylmalonamide. While in the first case an optimal extraction yield could be obtained, slower reaction kinetics prevented the second chemical system extraction from being complete. A way to improve mass transfer for slow systems is to increase the specific interfacial area. We therefore investigated liquid-liquid extraction for the same chemical systems by implementing segmented flows. Both the internal circulation stimulated within droplets by their passage along micro-channels and the increase in the interfacial area are responsible for a large enhancement in the interfacial mass transfer and reaction rate. Therefore, an improvement in liquid-liquid extraction yield could be expected. Based on previous works from Van Steijn and Xu, a numerical model was developed to accurately predict the characteristics of droplet production at a T-junction (volumes, frequency, spacing, and specific interfacial area) for the two aforementioned chemical systems. Using parameters screening, the respective influence of liquids viscosities, dimensional parameters and flow rates was evidenced. This numerical model was verified experimentally by generating on-chip segmented flows, and offered ways of improvement in both operating parameters and chip design. Finally, phase separation was obtained using selective membrane, and radionuclides micro-extractions were performed. Micro-extraction yields were compared to conventional batch extraction.
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Submitted on : Tuesday, January 14, 2020 - 11:02:23 AM
Last modification on : Thursday, September 17, 2020 - 12:30:34 PM
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  • HAL Id : cea-02438369, version 1

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A. Vansteene, J. Jasmin, R. Brennetot, C. Mariet, S. Cavadias, et al.. Liquid-liquid extraction of two radiochemical systems at micro-scale predict and achieve segmented flow to optimize mass transfer. BIT's 5th Annual Conference of AnalytiX 2017 (AnalytiX-2017), Mar 2017, Fukuoka, Japan. ⟨cea-02438369⟩

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