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Caractérisation expérimentale de la granulométrie des gouttes et de lʹaire interfaciale dans les systèmes dʹextraction liquide‐liquide par la réfractométrie arc‐en‐ciel

Abstract : This PhD thesis deals with the experimental study of liquid-liquid extraction within a laboratory column reproducing in a simple way the apparatuses used in a nuclear fuel reprocessing process (PUREX). A non-intrusive optical technique, called rainbow refractometry or diffractometry, has been specifically developed to characterize the size (and hence the interfacial area) and the composition of the dispersed phase. The latter is first time composed of millimeter droplets of alkanes mixtures free rising in a column filled with water at rest. Specificities of the rainbow produced by these droplets with a low relative refractive index were studied using different asymptotic light scattering models and the Lorenz-Mie electromagnetic theory. Thanks to the development of different direct and reverse (parametric) approaches, it was demonstrated both numerically and experimentally that this optical technique allows estimating individually (or collectively) the diameter (in average) and the mixing fraction of a few tens of thousands of droplets with a few percent of accuracy. Preliminary works have been carried out on the timeresolved extraction of acetone from an aqueous continuous medium to a sessile droplet initially composed of pure toluene. They have revealed that the transfer (diffusion and molecular splitting) constants can be estimated from the analysis of the temporal evolution of the rainbow signals using an inverse method that integrates a molecular diffusion model with a radial symmetry and an electromagnetic light scattering model.
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Submitted on : Friday, December 7, 2018 - 1:25:55 PM
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Mariam Ouattara. Caractérisation expérimentale de la granulométrie des gouttes et de lʹaire interfaciale dans les systèmes dʹextraction liquide‐liquide par la réfractométrie arc‐en‐ciel. Sciences de l'ingénieur [physics]. Université Aix Marseille, 2017. Français. ⟨tel-01948054⟩

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