The iodide iodate reaction method: The choice of the acid

Weiterentwicklung und Charakterisierung eines Spinning‐Disc‐Reaktors nach dem Rotor‐Stator‐Prinzip

“…Damit erfolgt bei geringen Volumenströmen die Dosierung der Säure ab einer gewissen Drehzahl in eine zunehmend rückvermischte Flüssigkeit. Da die VD‐Reaktion stark konzentrationsabhängig ist 23, 34, 35, erscheint die Mischeffizienz bei Dosierung in den rückvermischten Bereich geringer. Hier ist die Konzentration des Borsäureanions niedriger, wodurch anteilig mehr H + ‐Ionen über Gl.…”

On the scalability of microstructured mixing devices

“…The accuracy of this approach might be limited by the fact that the kinetic data of the Dushman reaction were collected at reactant concentrations far from those relevant to mixing studies [20,21]. Furthermore, it is shown in a recent study [22] that either the dissociation constants of sulfuric acid need to be included in the respective models or strong acids such as perchloric acid need to be used in the experiments, in order to provide an accurate quantitative description of mixing processes with the Iodide Iodate Reaction Method. Despite the shortcoming that the Iodide Iodate Reaction Method does not offer a reliable quantitative measure of mixing, the method can be used for scaling issues, when in case of a family of curves, representing the optical density of the resulting solutions as function of an independent variable, another independent variable can be found, which combines the family of curves to one single curve.…”

Test Reactions to Study Efficiency of

“…In many papers very good mixing in some new-developed micromixing devices is reported. However, as presented in subject literature (Bourne, 2008;Kölbl et al, 2013;Kölbl and Schmidt-Lehr, 2010) this reaction should be used with special precautions and its results interpreted very carefully. Its kinetics is limited to a narrow range of concentrations and also the use of sulpuric acid seems to be in doubt (Bourne, 2008;Kölbl et al, 2013;Kölbl and Schmidt-Lehr, 2010).…”

“…The rate of the second one has been studied since 1888, but there are still discussions about its applicability (Bourne, 2008;Kölbl et al, 2013;Kölbl and Schmidt-Lehr, 2010). Because the ionic strength I S varies during the micromixing process, the kinetics have to be expressed as a function of I S .…”

“… Kölbl et al, (2013) concluded recently that for estimation from the experimental product distribution of measures such as mixing times, the choice of acid has to be carefully considered. They suggest employing a very strong acid in the experiment or including the dissociation constant of -4 HSO in the reactive mixing models as suggested by Bourne (2008) and Kölbl and Schmidt-Lehr (2010).…”