Model Assessment for the Prediction of Mass Transfer Coefficients in Liquid‐Liquid Extraction Columns

Outili, Nawel; Méniai, Abdeslam-Hassen; Gneist, G.; Bart, Hans‐Jörg

doi:10.1002/ceat.200600356

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…At the top part of the column, large droplet behaves as an oscillating one with an extremely high mass transfer coefficient 55 . If the drop decreases in size at a critical rate, oscillation in the resultant droplet disappears while internal circulation starts to build up, enhancing the rate of mass transfer within the dispersed phase 56 . At the bottom part of the column, the droplet size is further reduced and becomes internally stagnant, resulting in a rigid drop which has low mass transfer coefficient 48,57 .…”

Section: Resultsmentioning

confidence: 99%

“…55 If the drop decreases in size at a critical rate, oscillation in the resultant droplet disappears while internal circulation starts to build up, enhancing the rate of mass transfer within the dispersed phase. 56 At the bottom part of the column, the droplet size is further reduced and becomes internally stagnant, resulting in a rigid drop which has low mass transfer coefficient. 48,57 Therefore, the mass transfer coefficient reported in the literature 45,58 is usually inversely proportional to the energy input.…”

Section: Evaluation Of the Mass Transfer Coefficient Modelsmentioning

confidence: 99%

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Modeling the axial distribution of mass transfer coefficient in an agitated‐pulsed extraction column

Tan

Wang

et al. 2022

AIChE Journal

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The dispersed phase holdup and drop size in solvent extraction columns vary along the column height and this affects the mass transfer coefficient and interfacial area. In this article, mass transfer study was performed experimentally using a 25 mm diameter agitated pulsed column. The axial distribution of mass transfer coefficient was determined by coupling population balance equation and axial dispersion model by taking the longitudinal variation in hydrodynamic performance into consideration. Feasibility of different mass transfer models in predicting concentration profiles was evaluated and a novel correlation based on effective diffusivity was developed. The results showed that both overall and volumetric mass transfer coefficients have significant change along the column height and greatly depends on the agitation speed and pulsation intensity. Increasing dispersed phase velocity also augments the overall mass transfer coefficient. The maximum number of transfer unit was measured to be 10 m−1 at agitation speed of 1000 rpm.

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Section: Resultsmentioning

confidence: 99%

Section: Evaluation Of the Mass Transfer Coefficient Modelsmentioning

confidence: 99%

Modeling the axial distribution of mass transfer coefficient in an agitated‐pulsed extraction column

Tan

Wang

et al. 2022

AIChE Journal

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“…The relative Reynolds number, Re, an important factor in determining the mass transfer coefficient, 46,47 was also calculated using eq 8. Figure 4d shows that the relative Reynolds number varies from 30 to 60 in one pulsation period, and there is no noticeable change in the range of relative Reynolds number with increasing the pulsation intensity.…”

Section: Drop Velocity 411 Effect Of Pulsation Intensitymentioning

confidence: 99%

Experimental Study of Unsteady Drag Coefficient of Droplets in a Liquid–Liquid System

Tan

Wang

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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In liquid−liquid contact process, the motion of droplets relative to the surrounding fluid always involves accelerating and decelerating, which affects the mass, heat, and momentum transfer. The lack of experimental data of the unsteady drag coefficient has been one of the limitations on the prediction of the unsteady flow field. In this study, the accelerated and decelerated water droplets in an organic phase were measured by a high-speed camera. The results show that with a decrease in droplet diameter, the acceleration becomes more significant, while the absolute relative velocity decreases, causing a lower Reynolds number. The Basset force and add mass force were solved numerically and compared with drag force. The unsteady drag coefficient is always smaller than the corresponding steady drag coefficient in the case of accelerating relative flow and larger than that in the case of decelerating relative flow. A new unsteady drag coefficient model has been established, which has an acceptable agreement with the experimental data.

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“…Venkatanarasaiah and Varma reported that the mass transfer coefficient depends linearly on the drop size and consequently on the dispersed phase holdup, which is a function of the pulse velocity . Various attempts have been made for designing liquid–liquid extraction columns based on the laboratory-scale single-drop experiment. − This approach primarily focuses on the determination of the overall mass transfer coefficient based on the dispersed phase drop formation, breakage, coalescence, and sedimentation. Many times, ReDrop , and the drop population balance , modeling approach have been used to arrive at the design of equipment.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Studies in Pulsed Sieve Plate Extraction Column for the Removal of Tributyl Phosphate from Aqueous Nitric Acid

Lade

Pakhare

Rathod

2014

Ind. Eng. Chem. Res.

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Removal of a saturated amount of tributyl phosphate (TBP) from a nuclear reprocessing aqueous waste stream is very important as far as economy of process as well as waste disposal is concerned. The present research work describes the detailed mass transfer studies for the removal of TBP from aqueous stream in a geometrically optimized pulsed sieve plate extraction column (PSPEC). The original industrial system, viz., 0.3 M nitric acid–TBP–normal paraffinic hydrocarbon (NPH), was used for the mass transfer studies. The effect of operating parameters such as continuous to dispersed phase velocity ratio and pulsed velocity on the volumetric mass transfer coefficient was investigated. The effect of operating parameters on the variation in axial concentration and holdup profile is also studied to evaluate the dynamic operation of the column for the attainment of steady state. The experimental results indicate that pulse velocity has a strong effect on the volumetric mass transfer coefficient, while the effect of the continuous phase flow rate is greater than the effect of the dispersed phase flow rate.

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Model Assessment for the Prediction of Mass Transfer Coefficients in Liquid‐Liquid Extraction Columns

Cited by 9 publications

References 5 publications

Modeling the axial distribution of mass transfer coefficient in an agitated‐pulsed extraction column

Modeling the axial distribution of mass transfer coefficient in an agitated‐pulsed extraction column

Experimental Study of Unsteady Drag Coefficient of Droplets in a Liquid–Liquid System

Mass Transfer Studies in Pulsed Sieve Plate Extraction Column for the Removal of Tributyl Phosphate from Aqueous Nitric Acid

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