Improvement of oxygen mass transfer estimation from oxygen concentration measurements in bubble column reactors

Gourich, Bouchaib; Vial, Christophe; Azher, N. El; Soulami, M. Belhaj; Ziyad, M.

doi:10.1016/j.ces.2006.04.045

Cited by 15 publications

(13 citation statements)

References 15 publications

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“…-There is no resistance against gas diffusion; therefore, the concentration of component i 1) in the gaseous bulk phase is equal to its gaseous concentration at the gas-liquid interface. -Each component entering into the successive stage, in gaseous or liquid form, disperses and its concentration does not change while leaving the stage.…”

Section: Assumptionsmentioning

confidence: 99%

“…Bubble columns reactors (BCR) are mass-transfer and reaction equipment in which one or several gases disperse through a deep pool of liquid and react with the liquid phase itself or with a component dissolved or suspended in it [1][2][3]. These reactors are widely used in chemical, biochemical, and petrochemical industries for oxidation, hydrogenation, chlorination, alkylation, polymerization, methanol production and Fischer-Tropsch synthesis [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Multistage Bubble Column Reactors for Oxidation Reaction

Behin

Shojaeimehr

2013

Chem Eng & Technol

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In this work, a mathematical model based on axial dispersion has been suggested to simulate the behavior of a multistage bubble column reactor. A six-stage pilotscale reactor with an inner diameter of 0.35 m and a height of 12 m was used for hydrogen peroxide production through the direct oxidation of isopropyl alcohol at isothermal condition. Steady-state and dynamic simulations were performed to predict the concentration of all the reactants in gas and liquid phases. It was observed that for steady state-conditions the simulation results were consistent with the experimental results. Dynamic models involving liquid back-mixing can be used for the simulation of start-up, shut-down or transition operations in this kind of a rector.

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Section: Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Multistage Bubble Column Reactors for Oxidation Reaction

Behin

Shojaeimehr

2013

Chem Eng & Technol

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“…Although numerous empirical correlations have been developed for gas-liquid mass transfer in bubble columns [2][3][4][5], airlift reactors [6][7][8], and stirred tanks [9][10][11][12], comparatively little is known concerning interphase mass transfer in Taylor-Couette flow cells [13][14][15][16], which have recently gained interest for use as bioreactors [17][18][19][20][21][22][23][24]. These devices, which consist of fluids confined in the annular space between two coaxial cylinders (see Fig.…”

Section: Introductionmentioning

confidence: 99%

An adaptive model for gas–liquid mass transfer in a Taylor vortex reactor

Gao

Kong

Ramezani

et al. 2015

International Journal of Heat and Mass Transfer

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a b s t r a c tGas-liquid Taylor-Couette flow devices have attracted interest for use as chemical and biological reactors, and consequently the accurate prediction of interphase mass transfer coefficients is crucial for their design and optimization. However, gas-liquid mass transport in these systems depends on many factors such as the local velocity field, turbulent energy dissipation rate, and the spatial distribution and size of bubbles, which in turn have complicated dependencies on process, geometric, and hydrodynamic parameters. Here we overcome these problems by employing a recently developed and validated Eulerian two-phase CFD model to compute local values of the mass transfer coefficient based upon the Higbie theory. This approach requires good estimates for mass transfer exposure times, and these are obtained by using a novel approach that automatically selects the appropriate expression (either the penetration model or eddy cell model) based upon local flow conditions. By comparing the simulation predictions with data from corresponding oxygen mass transfer experiments, it is demonstrated that this adaptive mass transfer model provides an excellent description for both the local and global mass transfer of oxygen in a semibatch gas-liquid Taylor-Couette reactor for a wide range of azimuthal Reynolds numbers and axial gas flow rates.

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“…Many authors were interested in cylindrical bubble columns to better understand the relation between voidage and superficial gas velocity, including regime transition, influence of injection plates, and water contamination, and finding suitable methods for flow pattern characterization , but since only a few focused on pseudo‐2D bubble columns, such pseudo‐2D flows are still not completely understood. Therefore, this investigation deals with this kind of bubble column configuration, which allows visual metrological methods to be applied .…”

Section: Introductionmentioning

confidence: 99%

Bubble Plume Oscillations in Viscous Fluids

2017

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The mixing potential of bubble column reactors for viscous fluids was investigated experimentally. A heterogeneously aerated pseudo-2D column was used to study hydrodynamics and especially low-frequency oscillation. Different metrological methods, such as particle image velocity, shadowgraphy, and pressure and oxygen sensors, were applied. Water and fluids with lower surface tension and higher viscosity but still showing Newtonian rheological behavior were used. A viscosity range of 1-100 mPa s was chosen to mimic bioreactor fluids. Two different spargers were employed to produce different bubble sizes and shapes. Injection flow rate was modified to create a wide spectrum of injection conditions. Different oscillating behaviors were found depending on the sparger and the fluid properties.

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Improvement of oxygen mass transfer estimation from oxygen concentration measurements in bubble column reactors

Cited by 15 publications

References 15 publications

Modeling of Multistage Bubble Column Reactors for Oxidation Reaction

Modeling of Multistage Bubble Column Reactors for Oxidation Reaction

An adaptive model for gas–liquid mass transfer in a Taylor vortex reactor

Bubble Plume Oscillations in Viscous Fluids

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