Uranium adsorption characteristics of a circulating fluidized‐bed adsorber

Ito, Yoshiro; Nakamura, Susumu; Shirakashi, Masataka; Kanno, Masayoshi

doi:10.1002/aic.690380609

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…To reach a continuous adsorption separation operation, a liquid−solid circulating fluidized bed (LSCFB) is a good choice. Studies on the hydrodynamics in the LSCFB can be found in recent literature. − Ito et al used the LSCFB adsorber to extract uranium from seawater. Lan et al − introduced a concept of LSCFB ion exchanger system for continuous recovery of biochemical products and studied the effect of operating conditions on the hydrodynamics and developed the successful application for the continuous recovery of bovine serum albumin (BSA).…”

Section: Introductionmentioning

confidence: 99%

“…Studies on the hydrodynamics in the LSCFB can be found in recent literature. [15][16][17] Ito et al 18 used the LSCFB adsorber to extract uranium from seawater. Lan et al [19][20][21] Industrial & Engineering Chemistry Research ARTICLE LSCFB ion exchanger system for continuous recovery of biochemical products and studied the effect of operating conditions on the hydrodynamics and developed the successful application for the continuous recovery of bovine serum albumin (BSA).…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics and Adsorption Mass Transfer in a Novel Gas−Liquid−Solid Circulating Fluidized Bed Adsorber

Lin

Liu

2011

Ind. Eng. Chem. Res.

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A novel gas−liquid−solid circulating fluidized bed adsorber for the separation of natural products or traditional Chinese medicines from extracts was successfully developed in this work. The hydrodynamics, axial dispersion, and mixing characteristics of phases and the adsorption and desorption of Ginkgo flavonoids in macroporous resin particles with prepared extract were investigated. The results showed that with the increase of downer superficial gas velocity, the deviation degree of flow pattern from plug flow, and the liquid back-mixing in the downer were enhanced because the liquid Pe number of the downer became smaller while its axial dispersion coefficient got larger. Similar tends were found for the riser as the riser superficial gas velocity climbed. Compared with that of the downer, the flow in the riser was more close to plug flow. Investigations on the adsorption kinetics of macroporous resin particles showed that the adsorption separation of Ginkgo flavonoids from extract was controlled by the surface film mass transfer and intraparticle diffusion. Experimental results of adsorption separation of Ginkgo flavonoids in the three-phase circulating fluidized bed indicated that the air bubbles introduced in a liquid−solid circulating fluidized bed could enhance the adsorption and desorption processes, and smaller particles, lower superficial feed velocity, and adsorbate concentration were favorable for the three-phase circulating fluidized bed adsorption separation. The adsorption model of the downer and the desorption model of the riser were built, and they predicted the adsorption and desorption processes well.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and Adsorption Mass Transfer in a Novel Gas−Liquid−Solid Circulating Fluidized Bed Adsorber

Lin

Liu

2011

Ind. Eng. Chem. Res.

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“…They unfortunately do not give the liquid axial dispersion coefficient used in the model. Ito et al [16] present a dispersive model for the adsorption of uranium in a circulating fluidized bed that they divide in slices. The number of slices, going from 1 to 30 depending on the simulations, does not affect the results significantly.…”

Section: Introductionmentioning

confidence: 99%

Modelling of heavy metals adsorption to a chelating resin in a fluidized bed reactor

Menoud

Cavin

Renken

1998

Chemical Engineering and Processing: Process Intensification

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Adsorption to a chelating resin is a method for recovering heavy metals from wastewater containing very light quantities of heavy metals ( B0.3 mol m − 3 , which approximately corresponds to 20 ppm). A thermodynamical study in a closed vessel showed that equilibrium is well represented by a Langmuir isotherm. Adsorption kinetics in a continuous stirred tank reactor were also conducted. Experiments were simulated by a global kinetics model comprising mass transfer in a liquid film around the resin particles, with diffusion through the pores and reaction on the adsorption sites. Kinetics has been found to be limited by film mass transfer for all metals studied (Cu 2 + , Ni 2 + , Co 2 + and Zn 2 + ). The mass transfer coefficient k L was found to be around 10 − 4 m s − 1 . Adsorption of heavy metals was then carried out at mini-pilot scale. Problems due to a decrease in particles mean radius during the adsorption prompted us to use a fluidized bed. It is also possible with this reactor to treat solutions containing suspended solids which would clog fixed beds. The decrease in particle radius (or increase in apparent density of the resin) produces a contraction of the fluidized bed: unloaded particles remain at the top of the bed and a density gradient appears throughout the column, leading to a stabilization of the fluidized bed. The measured phenomenon is well described by a liquid plug flow model with immobile resin in the column. As for the adsorption in the continuous stirred tank, the Langmuir model and the kinetics limited by film mass transfer were considered. The mass transfer coefficient k L was adjusted to a value around 10 − 5 m s − 1 .

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Adsoprtion and adsorptive separations: A bibliographical update (1992?1993)

Ray

1995

Adsorption

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Uranium adsorption characteristics of a circulating fluidized‐bed adsorber

Cited by 9 publications

References 6 publications

Hydrodynamics and Adsorption Mass Transfer in a Novel Gas−Liquid−Solid Circulating Fluidized Bed Adsorber

Hydrodynamics and Adsorption Mass Transfer in a Novel Gas−Liquid−Solid Circulating Fluidized Bed Adsorber

Modelling of heavy metals adsorption to a chelating resin in a fluidized bed reactor

Adsoprtion and adsorptive separations: A bibliographical update (1992?1993)

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