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

Abstract : Visualization of mass transfer is a powerful tool to improve understanding of local phenomenon. The use of an oxygen-sensitive dye (colorimetric technique) (Dietrich et al., Chem Eng Sci. 2013; 100:172-182) has showed its relevancy for locally visualizing and characterizing gas-liquid mass transfer at different scales (Kherbeche et al., Chem Eng Sci. 2013; 100: 515-528; Yang et al., Chem Eng Sci. 2016; 143:364-368). At present, the occurrence of a possible enhancement of the gas-liquid mass transfer by this reaction has not been yet demonstrated. This article 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 first estimated by carrying out experiments in a microchannel equipped with a micromixer. The diffusion coefficients of dihydroresorufin and O-2 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.
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Submitted on : Thursday, January 18, 2018 - 1:58:47 PM
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Lixia Yang, Nicolas Dietrich, Karine Loubiere, Christophe Gourdon, Gilles Hébrard. Optical methods to investigate the enhancement factor of an oxygen-sensitive colorimetric reaction using microreactors. AIChE Journal, Wiley, 2016, vol. 63 (n° 6), 13 p. ⟨10.1002/aic.15547⟩. ⟨hal-01601916⟩

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