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Mise en place de l'extraction liquide-liquide en microsystèmes établir des écoulements segmentés à façon pour optimiser le transfert de masse

Abstract : Liquid-liquid extraction is commonly used for radiochemical analysis. When miniaturized, it can benefit from the advantages of microfluidic tools i.e. possible coupling, precise control of the interfacial area between the aqueous and organic phases, and contact time. A first study, dedicated to liquid-liquid extraction with parallel flows of europium diluted in nitric acid by the N,N′-dimethyl-N,N′- dibutyltetradecylmalonic diamide [1, 2], allowed us to highlight the limitations of parallel flows for a slow chemical system. One way to optimize yields of extraction of the kinetically slow systems is to increase the specific interfacial area. For this reason, segmented flows formation and characteristics were investigated, as a function of the physicochemical properties of a biphasic system, flow rates and the dimensions of a focalized flux junction. In the following, two multiphase models of the droplets size corresponding to the transition and dripping regimes were validated and will be used for the optimization of the specific interfacial area.
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A. Vansteene, J.-P. Jasmin, L. Al Ahmad, S. Cavadias, G. Cote, et al.. Mise en place de l'extraction liquide-liquide en microsystèmes établir des écoulements segmentés à façon pour optimiser le transfert de masse. CFM 2017 - 23ème Congrès Français de Mécanique, Aug 2017, Lille, France. ⟨cea-02434552⟩

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