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

Yang, Lixia; Dietrich, Nicolas; Hébrard, Gilles; Loubière, Karine; Gourdon, Christophe

doi:10.1002/aic.15547

Cited by 33 publications

(53 citation statements)

References 40 publications

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“…Therefore, the influence of leuco‐indigo carmine oxidation on gas‐liquid mass transfer will be estimated in this work. The following rate equations are used to describe the reaction system :

true \frac{normald C_{normalLIC}}{normald t} = - ν k_{1} C_{{normalO}_{2}} C_{normalLIC}

true \frac{normald C_{normalInt}}{normald t} = ν k_{1} C_{{normalO}_{2}} C_{normalLIC} - ν k_{2} C_{{normalO}_{2}} C_{normalInt}

true \frac{normald C_{normalKIC}}{normald t} = ν k_{2} C_{{normalO}_{2}} C_{normalInt}

…”

Section: Methodsmentioning

confidence: 99%

“…C LIC,0 is known from preparation of the reaction solution,

C_{O_{2}}^{*}

and

D_{O_{2}}

are known from literature for the oxidation of dihydroresorufin , , which is close to the reaction mixture investigated in this work. D LIC , k 1 , k 2 , and k L are unknown and measured experimentally, which is described in the following chapters.…”

Section: Methodsmentioning

confidence: 99%

“…This method is based on image processing and has been calibrated and vali-dated by means of UV-Vis spectroscopy and is described in more detail in Krieger et al [28]. It is known from the work of Yang et al [32] that a similar redox dye, namely dihydroresorufin, contributes a negligible amount to the enhancement of mass transfer (E = 1.03) for the investigated conditions, but a study for the oxidation of leucoindigo carmine has not been done so far. Therefore, the influence of leuco-indigo carmine oxidation on gas-liquid mass transfer will be estimated in this work.…”

Section: Enhancement Factor Of Leuco-indigo Carmine Oxidationmentioning

confidence: 99%

“…Therefore, the influence of leuco-indigo carmine oxidation on gas-liquid mass transfer will be estimated in this work. The following rate equations are used to describe the reaction system [32]:…”

Section: Enhancement Factor Of Leuco-indigo Carmine Oxidationmentioning

confidence: 99%

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Kinetic Study of Leuco‐Indigo Carmine Oxidation and Investigation of Taylor and Dean Flow Superposition in a Coiled Flow Inverter

et al. 2019

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In two‐phase capillary flow, Taylor and Dean vortices can enhance mass transfer according to recent studies. By utilizing a colorimetric method based on the consecutive oxidation of leuco‐indigo carmine it is possible to visualize the superposition of Taylor and Dean vortices in a gas‐liquid system. A kinetic study is performed in order to estimate the enhancement factor. Depending on the flow conditions, three different flow regimes are identified with different intensities of Taylor and Dean vortices affecting the oxygen distribution within the liquid phase. A dimensionless number is derived that describes this transition in flow regimes.

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true \frac{normald C_{normalLIC}}{normald t} = - ν k_{1} C_{{normalO}_{2}} C_{normalLIC}

true \frac{normald C_{normalInt}}{normald t} = ν k_{1} C_{{normalO}_{2}} C_{normalLIC} - ν k_{2} C_{{normalO}_{2}} C_{normalInt}

true \frac{normald C_{normalKIC}}{normald t} = ν k_{2} C_{{normalO}_{2}} C_{normalInt}

…”

Section: Methodsmentioning

confidence: 99%

“…C LIC,0 is known from preparation of the reaction solution,

C_{O_{2}}^{*}

and

D_{O_{2}}

Section: Methodsmentioning

confidence: 99%

Section: Enhancement Factor Of Leuco-indigo Carmine Oxidationmentioning

confidence: 99%

Section: Enhancement Factor Of Leuco-indigo Carmine Oxidationmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Study of Leuco‐Indigo Carmine Oxidation and Investigation of Taylor and Dean Flow Superposition in a Coiled Flow Inverter

et al. 2019

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“…Further, it is possible that the reaction enhances mass transfer for the investigated operating conditions as described by Yang et al [24]. A more detailed study on the influence of slug and bubble length on mass transfer as well as possible enhancement of mass transfer due to the chemical reaction will be carried out in future work.…”

Section: Mass Transfermentioning

confidence: 99%

Local Mass Transfer Phenomena and Chemical Selectivity of Gas‐Liquid Reactions in Capillaries

et al. 2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthday Gas-liquid reactions in microreactors play an important role in scientific research and industry. Enhancing heat and mass transfer allows overcoming mass transfer limitations in gas-liquid reactions. Mass transfer can be further increased by employing helically coiled capillaries, which induce Dean vortices and improve radial mixing. A colorimetric technique is proposed for gas-liquid reactions in straight and helically coiled capillaries in order to visualize local mass transfer phenomena and concentration distributions. This method is based on the consecutive oxidation of leuco-indigo carmine and enables noninvasive investigation of mass transfer and chemical selectivity in microchannels with high temporal and spatial resolution.

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Hydrodynamics and local mass transfer characterization under gas–liquid–liquid slug flow in a rectangular microchannel

Liu

Yue

et al. 2019

AIChE Journal

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Gas-liquid-liquid three-phase slug flow was generated in a glass microreactor with rectangular microchannel, where aqueous slugs were distinguished by relative positions to air bubbles and organic droplets. Oxygen from bubbles reacted with resazurin in slugs, leading to prominent color changes, which was used to quantify mass transfer performance. The development of slug length indicated a film flow through the corner between bubbles and the channel wall, where the aqueous phase was saturated with oxygen transferred from bubble body. This film flow results in the highest equivalent oxygen concentration within the slug led by a bubble and followed by a droplet. The three-phase slug flow subregime with alternate bubble and droplet was found to benefit the overall mass transfer performance most. These results provide insights into a precise manipulation of gas-liquid-liquid slug flow in microreactors and the relevant mass transfer behavior thereof.

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

Cited by 33 publications

References 40 publications

Kinetic Study of Leuco‐Indigo Carmine Oxidation and Investigation of Taylor and Dean Flow Superposition in a Coiled Flow Inverter

Kinetic Study of Leuco‐Indigo Carmine Oxidation and Investigation of Taylor and Dean Flow Superposition in a Coiled Flow Inverter

Local Mass Transfer Phenomena and Chemical Selectivity of Gas‐Liquid Reactions in Capillaries

Hydrodynamics and local mass transfer characterization under gas–liquid–liquid slug flow in a rectangular microchannel

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