Prediction of complete mixing of liquid-fluidized binary solid particles

Moritomi, Hiroshi; Yamagishi, T.; Chiba, Tadatoshi

doi:10.1016/0009-2509(86)87010-5

Cited by 76 publications

(26 citation statements)

References 18 publications

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“…These conclusions, based on the predictions of the Richardson and Zaki correlation, are in agreement with the observations of Moritomi et al [3] In Fig. 4, the predictions of the generalized Richardson and Zaki correlation are compared with the experimental data of Moritomi et al [4] for the system of 0.776 mm hollow char and 0.163 mm glass beads. This figure shows the dependence of the inversion velocity on the bulk composition of the bed.…”

Section: Resultssupporting

confidence: 83%

“…(16), in fact, determines the composition of the lower layer of the binary solid-liquid fluidized bed as per stability considerations. Moreover, as pointed out by Moritomi et al, [4] it is the composition of the lower layer at a given velocity that, in turn, determines the bulk composition of the bed at which the layer inversion takes place.…”

Section: Resultsmentioning

confidence: 94%

“…1. Here, the comparison is made with the experimental data of Moritomi et al [4] for the water fluidization of hollow char and glass beads. It is evident from the figure that the agreement is excellent.…”

Section: Resultsmentioning

confidence: 97%

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Generalized Richardson‐Zaki Correlation for Liquid Fluidization of Binary Solids

Asif¹

1998

Chem Eng & Technol

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 94%

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Generalized Richardson‐Zaki Correlation for Liquid Fluidization of Binary Solids

Asif¹

1998

Chem Eng & Technol

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“…Complete mixing and bed inversion of bidisperse suspensions have long been of particular interest [37,64,65,66,67]. Berres et al [62] established compatibility conditions for bidisperse systems and later [63] extended the analysis to tridisperse and higher discrete polydisperse systems.…”

Section: Fluidizationmentioning

confidence: 99%

Applications of polydisperse sedimentation models

Berres

Bürger

Tory

2005

Chemical Engineering Journal

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“…Moritomi et al [37] showed that the segregation of a binary fluidized mixing (for instance the loaded and unloaded Chelamine particles) depends on the mean radius r p , on the apparent density z ap of each particle, on the superficial velocity u and on the liquid density z. They provided a segregation map which can predict, for the fluidization of the Chelamine, that the loaded resin remains, for whatever superficial velocity, below the unloaded resin.…”

Section: Fluidized Bed Adsorptionmentioning

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 .

show abstract

Prediction of complete mixing of liquid-fluidized binary solid particles

Cited by 76 publications

References 18 publications

Generalized Richardson‐Zaki Correlation for Liquid Fluidization of Binary Solids

Generalized Richardson‐Zaki Correlation for Liquid Fluidization of Binary Solids

Applications of polydisperse sedimentation models

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

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