No abstract

Ein vielversprechendes Reaktorkonzept zur Prozessintensivierung stellt der Spinning-Disc-Reaktor (SDR) dar. Im Rahmen dieser Arbeit wurde der Reaktor zu einem SDR nach dem Rotor-Stator-Prinzip weiterentwickelt, wobei die rotierende Scheibe von einem zylindrischen Stator umgeben ist. Zum besseren Verständnis der Vorgänge in dem dünnen, stark gescherten Flüssigkeitsfilm wird die Mikrovermischung mithilfe der Villermaux-Dushman-Reaktion untersucht. Darüber hinaus erfolgt eine systematische Untersuchung der Einflussparameter auf die Stoffübergangsvorgänge bei der heterogen katalysierten Glucose-Oxidation. Hierzu wird ein Pt/C-Katalysator auf der Scheibe immobilisiert. Further Development and Characterization of a Rotor-Stator Spinning Disc ReactorThe spinning disc reactor (SDR) is a promising reactor concept for process intensification. For this work, the reactor is modified into a rotor-stator SDR by placing the disc in a cylindrical shroud. The Villermaux-Dushman reaction is applied to investigate the effect of high shear forces on mixing efficiency of liquid flow in the narrow reactor cavity. Subsequently, this allows the methodical examination of mass transfer properties for heterogeneously catalyzed reactions. The glucose oxidation with dissolved oxygen in water is studied as model reaction employing a Pt/C catalyst immobilized on the rotating disc.

In contrast to all other transition‐metal‐catalyzed hydrostannation reactions documented in the literature, the addition of Bu3SnH across various types of alkynes proceeds with excellent trans selectivity, provided the reaction is catalyzed by [Cp*Ru]‐based complexes. This method is distinguished by a broad substrate scope and a remarkable compatibility with functional groups, including various substituents that would neither survive under the conditions of established Lewis acid mediated trans hydrostannations nor withstand free‐radical reactions. In case of unsymmetrical alkynes, a cooperative effect between the proper catalyst and protic functionality in the substrate allows outstanding levels of regioselectivity to be secured as well.