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Hlawitschka, Mark W.; Ossberger, Martin; Backes, Christian; Klüfers, Peter; Bart, Hans-Jörg (2017): Reactive Mass Transfer of Single NO Bubbles and Bubble Bouncing in Aqueous Ferric Solutions - A Feasibility Study. In: Oil & Gas Science and Technology-Revue D Ifp Energies Nouvelles, Vol. 72, No. 2, 11
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Reactive bubble columns are widely used in the chemical, petrochemical, biochemical and metal industries. While the reactive mass transfer around a single spherical shaped bubble is quite well described in literature, the influence of hydrodynamic interactions, such as bubble bouncing or coalescence on mass transfer - with and without chemical reaction - is not well understood. As to this, high resolution simulations and sophisticated experimental analysis based on high-speed camera images and local color changes gives a new firm basis. In this work, a new system is presented, based on Nitric Oxide (NO) gas absorbed in a FeII-solution. The reaction rate can be adjusted by the addition of ligands and the resulting local color change is detected. The impact of the colliding bubbles leads to a deformation of the bubble shapes and creates a fast movement of the bubble interfaces, which, finally, leads to an increased mass transfer. The results of five tested ligands reveal the high potential of the reactive Fe-II(NO) system to investigate basic phenomena affecting yield and selectivity of mixing-sensitive chemical reactions.