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Optical methods to investigate the enhancement factor of an oxygen-sensitive colorimetric reaction using microreactors

Yang, Lixia and Dietrich, Nicolas and Loubiere, Karine and Gourdon, Christophe and Hebrard, Gilles Optical methods to investigate the enhancement factor of an oxygen-sensitive colorimetric reaction using microreactors. (2017) AIChE Journal, 63 (6). 2272-2284. ISSN 0001-1541

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Official URL: http://dx.doi.org/10.1002/aic.15547

Abstract

Visualization of mass transfer is a powerful tool to improve understanding of local phenomenon. The use of an oxygen-sensitive dye (colorimetric technique1) has showed its relevancy for locally visualizing and characterizing gas-liquid mass transfer at different scales2,3. At present, the occurrence of a possible enhancement of the gas-liquid mass transfer by this reaction has not been yet demonstrated. This paper aims at filling this gap by evaluating the Hatta number Ha and the enhancement factor E associated with the oxygen colorimetric reaction when implementing in milli/micro channels. For that, as data on the kinetic of the colorimetric reaction are seldom in the literature, the reaction characteristic time was firstly estimated by carrying out experiments in a microchannel equipped with a micromixer. The diffusion coefficients of dihydroresorufin and O2 were then determined by implementing two original optical methods in a specific coflow microchannel device, coupled with theoretical modelling. The knowledge of these parameters enabled at last to demonstrate that no enhancement of the gas-liquid mass transfer by this colorimetric reaction existed. Complementary information about the reliability of the colorimetric technique to characterize the gas-liquid mass transfer in milli/micro systems was also given

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The original PDF of the article can be found at AIChE Journal website : http://onlinelibrary.wiley.com/doi/10.1002/aic.15547/abstract
HAL Id:hal-01601916
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Karine LOUBIERE
Deposited On:21 Dec 2017 13:29

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