Characterization of Mixing Efficiency in Polymerization Reactors Using Competitive‐Parallel Reactions

Abstract

Summary: In this article particular attention is paid to processes of mixing fluids with different viscosities relevant for polymerization where the reaction is fast and mixing is the limiting factor. Apart from this, mixing fluids with different viscosities is still one of the challenging tasks in industrial chemistry. Therefore, the characterization of mixing elements is another important topic.Two different multiple chemical reactions, based on the principle of competitive‐parallel reactions, were used and compared to investigate (micro)mixing efficiency in polymerization reactors. The well‐known Villermaux‐Dushman reaction and the third Bourne reaction were applied. The observed product distribution represents the quantity of segregation of the fluid which gives in turn information about the dependency on certain parameters like type and speed of stirrer, dosing period, feed position, and the viscosity of the fluid.The results from semibatch and continuous stirred tank reactors and two different stirrers, Rushton and INTERMIG® impeller, are discussed.

Modular, Flexible, and Continuous Plant for Radical Polymerization in Aqueous Solution

“…Furthermore, in order to adjust the spatial variation of the concentrations of the reactants, several side injections of reactants were set along the tubular reactor. Since mixing fluids of very different viscosities might not be instantaneous, the improvement of mass transfer thanks to the presence of static mixers was a key point for the use of side injections in the process . Such a strategy could be applied for both case studies and was further investigated in another paper .…”

CFD modeling of mixing intensification assisted with ultrasound wave in a T-type microreactor

“…The segregation index in a parallelcompeting reaction [30] is used as an inexpensive and simple test method to show mixing performance in many research [31][32][33]. In the present work, a method based on a parallelcompeting reactions, called Dushman reactions, was used.…”

Test Reactions to Study Efficiency of

“…The most interesting ones include: tubular reactors (Bałdyga and Henczka, 1997), static mixers (Fang and Lee, 2001;, jets (Baldyga et al, 1994), centrifugal pumps (Bolzern and Bourne, 1985), membrane reactors (Baccar et al, 2009;Jia et al, 2006), sonoreactors (Faryadi et al, 2014;Lee et al, 2014;Monnier et al, 1999;Monnier et al, 2000;Parvizian et al, 2011;Parvizian et al, 2012), reactors with torus shape (Nouri et al, 2008), reactors for polymerisation (Kunowa et al, 2007). Diazo-coupling reactions, ester hydrolysis reactions, and Villermaux-Dushman reaction were applied in these investigations.…”