Bubble characteristics in pressurized bubble column associated with micro-bubble dispersion

Bae, Keon; Go, Gang Seok; Noh, Nam Seon; Lim, Young‐Il; Bae, Jong-Wook; Lee, Dong Hoon

doi:10.1016/j.cej.2019.03.215

Cited by 19 publications

(7 citation statements)

References 19 publications

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“…DGD experiments were performed to investigate the gas phase structure. 45 In the DGD experiments, the gas supply was quickly shut-off and the gas holdup variation with time was monitored. Typical DGD curves for the effect of particle concentrations on gas holdup are shown in Figure 3.…”

Section: Measurement Techniques and Methodsmentioning

confidence: 99%

Effect of particles on hydrodynamics and mass transfer in a slurry bubble column: Correlation of experimental data

et al. 2022

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The effects of particle concentration and size on hydrodynamics and mass transport in an air–water slurry bubble column were experimentally studied. When the particle concentration αs increased from 0% to 20%, the averaged gas holdup decreased by ~30%, gas holdup of small bubbles and gas–liquid volumetric mass transfer coefficient decreased by up to 50%, while the gas holdup of large bubbles increased slightly. The overall effect of particle size was insignificant. A liquid turbulence attenuation model which could quantitatively describe the effects of particle concentration and size was first proposed. Semi‐empirical correlations were obtained based on extensive experimental data in a wide range of operating conditions and corrected liquid properties. The gas holdup and mass transfer coefficient calculated by the correlations agreed with the experimental data from both two‐phase and three‐phase bubble columns, with a maximum error <25%.

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Section: Measurement Techniques and Methodsmentioning

confidence: 99%

Effect of particles on hydrodynamics and mass transfer in a slurry bubble column: Correlation of experimental data

et al. 2022

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“…For the quasi-homogeneous catalytic hydrogenation reaction, gas–liquid mass transfer is the main limiting factor and further affects the macroscopic reaction rate. , When the hydrogen pressure increased, the saturation concentration of hydrogen in EAQ working solution augmented. Also, bubbles may be formed in the working solution in the RPB reactor because of circulation and turbulence. , These factors led to an acceleration in the mass-transfer rate of hydrogen from the gas to liquid phase and allowed more hydrogen to participate in the catalytic hydrogenation to speed up the reaction rate.…”

Section: Resultsmentioning

confidence: 99%

“…Also, bubbles may be formed in the working solution in the RPB reactor because of circulation and turbulence. 40,41 These factors led to an acceleration in the mass-transfer rate of hydrogen from the gas to liquid phase and allowed more hydrogen to participate in the catalytic hydrogenation to speed up the reaction rate.…”

Section: Hydrogenationmentioning

confidence: 99%

Process Intensification of Quasi-Homogeneous Catalytic Hydrogenation in a Rotating Packed Bed Reactor

Wang

Liu

Wang

et al. 2019

Ind. Eng. Chem. Res.

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Quasi-homogeneous catalytic hydrogenation benefits from the absence of intraparticle diffusion in the catalyst with the gas–liquid–solid system. However, it still suffers from the gas–liquid mass-transfer resistance, which limits the hydrogenation reaction rate. In this work, a rotating packed bed (RPB) reactor was first applied for the intensification of quasi-homogeneous catalytic hydrogenation, employing hydrogenation of 2-ethylanthraquinone (EAQ) as the test system. Effects of operating conditions, including rotational speed of the RPB reactor, initial concentration of EAQ, hydrogen pressure, reaction temperature, and volume ratio of the solvent on H2O2 yield and selectivity were investigated. The space time yield in the RPB reactor reached 369.8 gH2O2 ·gPd –1·h–1, which was much higher than that of 14.5 gH2O2 ·gPd –1·h–1 in the slurry stirred tank reactor under the same conditions. Applying RPB technology for the quasi-homogeneous catalytic reaction can be regarded as a new strategy for hydrogenation process intensification.

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“…The complex flow patterns and the inherently multiscale behavior of multiphase flows in BCR/SBCR make their reasonable design, scale-up, and optimization rather challenging. Hence, many studies of BCR/SBCRs frequently focus on the following topics: the relationship between the flow pattern and design parameters, − investigations of bubble characteristics, − correct modeling of interphase forces, − local and average heat transfer measurements, − etc. The effects of internal design, operating conditions, column dimensions, and physical properties of each phase were commonly studied in these studies. − Joshi et al reviewed efforts to model the flow patterns of BCRs and the formulation of interfacial forces.…”

Section: Introductionmentioning

confidence: 99%

Review on the Effect of Gas Distributor on Flow Behavior and Reaction Performance of the Bubble/Slurry Reactors

Zhao

Lian

et al. 2021

Ind. Eng. Chem. Res.

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Gas distributors greatly affect the performance of bubble column or slurry bubble column reactors (BCR/SBCRs). Investigation of design parameters characterizing the operation and transport phenomena of gas distributors in BCR/SBCRs can lead to a better understanding of hydrodynamic properties and mass transfer mechanisms. The performance of gas distributors is often described using various mathematical models and computational fluid dynamics simulations supported by experimental research. Nonetheless, little effort has been made to review the effect of the configurations of gas distributors on BCR/SBCR performance. The negative consequences of weeping and uneven gas maldistribution caused by unreasonable design of the distributor were rarely appreciated. This paper reviews the effects of gas distributor configuration on flow behavior and reaction performance. Adequate information about the design and development of gas distributor technology in BCR/SBCRs is provided. Some suggestions for potential research to better comprehend the effects of gas distributor design are put forward.

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Bubble characteristics in pressurized bubble column associated with micro-bubble dispersion

Cited by 19 publications

References 19 publications

Effect of particles on hydrodynamics and mass transfer in a slurry bubble column: Correlation of experimental data

Effect of particles on hydrodynamics and mass transfer in a slurry bubble column: Correlation of experimental data

Process Intensification of Quasi-Homogeneous Catalytic Hydrogenation in a Rotating Packed Bed Reactor

Review on the Effect of Gas Distributor on Flow Behavior and Reaction Performance of the Bubble/Slurry Reactors

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