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New protocol of the Villermaux-Dushman reaction system to characterize micromixing effect in viscous media

Abstract : This paper presents the results of the characterization of a new method for quantification of the micromixing efficiency in a viscous medium in stirred tank reactors. The used method is inspired by a chemical system based on two competitive reactions, the iodide-iodate reaction system (Villermaux-Dushrnan method), whose products selectivity is a measure of the mixing efficiency. The approach proposes a new protocol based on a phosphate buffer and the use of HydroxyEthylCellulose (NEC, 720, 000 g/mol) as an inert viscosifying agent, exhibiting various interesting properties (no disturbance of the spectrophotometric measure, low cost, low required amount, eco-friendly product). This agent is almost Newtonian up to 0.25 wt% in water and becomes non-Newtonian above 0.5 wt%. By means of its use, the viscosity of the reactive medium can be raised by around two orders of magnitude while adding less than 1 wt% HEC to the water solution. Preliminary micromixing results of moderate viscous solutions (50 mP as with NEC 0.5 wt%) in a stirred tank reactor are presented.
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https://hal.univ-lorraine.fr/hal-01274191
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Submitted on : Monday, February 15, 2016 - 3:29:46 PM
Last modification on : Thursday, February 7, 2019 - 5:12:38 PM

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Jordanna Pinot, Jean-Marc Commenge, Jean-François Portha, Laurent Falk. New protocol of the Villermaux-Dushman reaction system to characterize micromixing effect in viscous media. Chemical Engineering Science, Elsevier, 2014, 118, pp.94-101. ⟨10.1016/j.ces.2014.07.010⟩. ⟨hal-01274191⟩

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