Gas-liquid mass transfer in a two-stage draft tube gas-liquid-solid fluidized bed

Fan, Liang‐Shih; Ramesh, T.S.; Tang, Wen-Tzung; Long, Ti R.

doi:10.1016/0009-2509(87)80016-7

Cited by 14 publications

(2 citation statements)

References 7 publications

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“…A few studies have appeared on the influence of solids on k,u and cG in a draft tube slurry reactor (Fan et al, 1987;Muroyama et al, 1985Muroyama et al, , 1983. In these studies the inner tube diameters were rather small (5, 6.4 and lOcm, respectively).…”

Section: Becausementioning

confidence: 99%

Mass transfer in gas—liquid slurry reactors

Beenackers

Swaaij

1993

Chemical Engineering Science

208

124

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critical review is presented on the mass transfer characteristics of gas-liquid slurry reactors. The recent findings on the influence of the presence of solid particles on the following mass transfer parameters in slurry reactors are discussed: volumetric gas-liquid mass transfer coefficients (kLa, kGa), liquid-side mass transfer coefficients (kL and k,) and specific gas-slurry contact area (a). The second part of this paper reviews the recent progress in our knowledge and understanding of the enhancement of gas-slurry mass transfer due to the-presence of solids. Fiie different cases are distinguished, i.e.-enhanced mass transfer by physical adsorption on small particles,-enhanced mass transfer by fast homogeneous reactions in the slurry, due to inert particles,-enhanced mass transfer by homogeneous reaction in the liquid with dissolving particles,-enhanced mass transfer due to reactive particles and enhanced mass transfer due to catalytic particles in heterogeneous reactive systems.

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Section: Becausementioning

confidence: 99%

Mass transfer in gas—liquid slurry reactors

Beenackers

Swaaij

1993

Chemical Engineering Science

208

124

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“…Previous studies on energy consumption and mass transfer during adsorption of dyes on clay using mechanical and gas stirring proved that not only gas stirring enhances the efficiency of dye adsorption but also the energy consumption was substantially lower for air stirring; approximately 60 times lower than for mechanical stirring under identical conditions of adsorption [9]. The high efficiency of gas stirring in increasing the rate of mass transfer compared to single phase flow was attributed to the ability of gas bubbles to induce radial momentum transfer [10]. As any separation process, adsorption efficiency is a complex attribute dependent on the kinetic and equilibrium properties of the adsorbate/adsorbent system.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Process Design for Adsorption of Maxilon Red Dye From Aqueous Solutions Using Gas Mixing

Nassar

Farrag²

2012

The International Conference on Chemical and Environmental Engi

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The gas mixing technique was used to study the kinetics of adsorption of a dye from its solution. Equilibrium and kinetic studies were investigated for the adsorption of Maxilon Red BL-3 onto a low cost adsorbent (natural clay). Linear regression was used to determine the best fit of equilibrium and kinetics expressions. The two parameters models including Freundlich, Temkin, Dubinin-Radushkevich and four different linearized forms of Langmuir were employed for fitting the equilibrium data. Type I of Langmuir model was found to be the best model that represents experimental data and the monolayer adsorption capacity was determined as 344.83 mg/g at 25ºC. Factors influencing dye adsorption such as gas flow rate, initial dye concentration and temperature were investigated. Four kinetic models, pseudo firstorder, pseudo second-order, Elovich and fractional power kinetic models were selected to follow the adsorption process. A comparison of the kinetic models on the overall adsorption rate showed that the adsorption system using gas mixing was best described by pseudo second-order kinetics. Based on the sorption isotherm relations obtained a single stage batch adsorber was designed for different initial dye concentrations to calculate the optimum effluent volume based on dye concentration/adsorbent mass ratio.

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Two‐ and Three‐Phase Sparged Reactors

Pangarkar

2014

Design of Multiphase Reactors

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Gas-liquid mass transfer in a two-stage draft tube gas-liquid-solid fluidized bed

Cited by 14 publications

References 7 publications

Mass transfer in gas—liquid slurry reactors

Mass transfer in gas—liquid slurry reactors

Kinetics and Process Design for Adsorption of Maxilon Red Dye From Aqueous Solutions Using Gas Mixing

Two‐ and Three‐Phase Sparged Reactors

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