Mass transfer study on counter current multi-stage fluidized bed ion exchanger

Kishore, Kaushal; Verma, Nishith

doi:10.1016/j.cep.2005.04.007

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…However, if regeneration needs more residence time and/or many theoretical stages, the riser acts as a transport arm and another multistage column can be provided for regeneration. These unique features of SLCMFB make them suitable for various industrial processes such as production of linear alkylbenzene, , continuous recovery of fermentation products, − removal and recovery of cesium from liquid radioactive nuclear waste streams, wastewater treatment, and continuous enzymatic polymerization of phenol in biorefining process . The present work addresses the solid−liquid circulating multistage fluidized bed (SLCMFB) shown in Figure A.…”

Section: Introductionmentioning

confidence: 99%

Solid−Liquid Circulating Multistage Fluidized Bed: Hydrodynamic Study

Chavan

Kalaga

Joshi

2009

Ind. Eng. Chem. Res.

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The solid−liquid circulating multistage fluidized bed (SLCMFB) was constructed with the principal components being the riser column and the multistage column. The riser column was made up of 50 mm i.d. and 2 m long glass pipe while the multistage column was made up of seven glass stages of 100 mm i.d. and 100 mm length. The ion-exchange resin was used as solid phase and water as fluidizing medium. The flow characteristics of SLCMFB were investigated for 0.365, 0.605, and 0.725 mm particle sizes (dry basis). The voidage in the riser and multistage column was measured using γ-ray tomography (GRT). In the riser column, the voidage was found to be maximum at the center and minimum near the wall. However, in the multistage column, voidage was found to be uniform over cross section of the column. The solid particle velocity was measured using ultrasonic velocity profiler (UVP) in the riser column. The particle velocity profiles show similar trend as the voidage, confirming the existence of the radial non-uniformity in the riser column. Further, the non-uniformity was analyzed using the drift flux model (DFM) and the effect of particle size and superficial liquid velocity on the non-uniformity was also investigated.

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Section: Introductionmentioning

confidence: 99%

Solid−Liquid Circulating Multistage Fluidized Bed: Hydrodynamic Study

Chavan

Kalaga

Joshi

2009

Ind. Eng. Chem. Res.

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“…The model developed by them could predict the experimentally measured outlet concentration quite satisfactorily. The studies reported by Tokuyama et al, [4] and Kishore and Varma [5] were on systems operated under multistage mode of contacting with downspouts.…”

Section: Introductionmentioning

confidence: 97%

“…It was reported that an increase in stage number is effective in ion removal and ion loading. Kishore and Verma [5] developed a five stage countercurrent column for the removal of OH -ions from wastewater using ion exchange resin. It was observed that the ion removal and ion loading increases as the number of stages is increased.…”

Section: Introductionmentioning

confidence: 99%

Dye removal in steady-state continuous countercurrent liquid–solid adsorber

Nagarajan

Renganathan

Krishnaiah

2016

Separation Science and Technology

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Mass transfer studies have been carried out in a continuous countercurrent liquid-solid adsorber to remove methylene blue from wastewater using activated carbon under steady state conditions. Experimental data on axial concentration profile and overall removal efficiency has been obtained using a pilot plant setup. The overall colour removal efficiency of the adsorber increases with increase in solid velocity, and a decrease in liquid velocity and initial dye concentration. A mathematical model has been developed to predict the axial concentration profiles, which compare with the experimental data satisfactorily. The overall mass transfer coefficient has also been evaluated using this model.

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“…Although the main section operates in conventional fluidization regime, an additional operating variable (solid circulation rate) affects the flow characteristics considerably. Kishore and Verma (2006), Singh et al (2008), and Verma et al (2009) are the few studies wherein hydrodynamic characteristics of multistage SLFB have been investigated. In these studies, however, solid particles are fed from the top using a conveyer belt and therefore neglecting the risk of maintaining a dynamic seal between the two columns.…”

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confidence: 99%

Solid-liquid circulating fluidized bed: a way forward

Thombare

Chavan

Bankar

et al. 2017

Reviews in Chemical Engineering

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AbstractSolid-liquid circulating fluidized beds (SLCFBs) offer several attractive features over conventional solid-liquid fluidized beds such as efficient liquid-solid contact, favorable mass and heat transfer, reduced back-mixing of phases, and integrated reactor and regenerator design. These unique features have stimulated theoretical and experimental investigations over the past two decades on transport phenomena in SLCFBs. However, there is a need to compile and analyze the published information with a coherent theme to design and develop SLCFB with sufficient degree of confidence for commercial application. Therefore, the present work reviews and analyzes the literature on hydrodynamic, mixing, heat transfer, and mass transfer characteristics of SLCFBs comprehensively. Suitable recommendations have also been made for future work in concise manner based on the knowledge gaps identified in the literature. Furthermore, a novel multistage SLCFB has been proposed to overcome the limitations of existing SLCFBs. The proposed model of SLCFB primarily consists of a single multistage column which is divided into two sections wherein both the steps of utilizationviz.loading (adsorption, catalytic reaction, etc.) and regeneration of solid phase could be carried out simultaneously on a continuous mode.

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Mass transfer study on counter current multi-stage fluidized bed ion exchanger

Cited by 13 publications

References 11 publications

Solid−Liquid Circulating Multistage Fluidized Bed: Hydrodynamic Study

Solid−Liquid Circulating Multistage Fluidized Bed: Hydrodynamic Study

Dye removal in steady-state continuous countercurrent liquid–solid adsorber

Solid-liquid circulating fluidized bed: a way forward

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