Investigation of mass transfer performance in an L-shaped pulsed sieve plate extraction column using axial dispersion model

Rafiei, Vahid; Safdari, Jaber; Moradi, Sajad; Amani, Pouria; Mallah, Mohammad Hassan

doi:10.1016/j.cherd.2017.10.006

Cited by 20 publications

(4 citation statements)

References 59 publications

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“…Solvent extraction is a highly effective separation method since it provides various advantages including selective separation, high flexibility of operations, various solvents, etc. [1][2][3]. Many different types of column internals and mechanical agitation options have been developed for solvent extraction columns to increase the column efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Each kind has its own advantages and disadvantages. It has been revealed that the mass transfer efficiency is comparable in both types of columns, whereas area limitations are influential variables that affect the industrial use of these columns [3,7]. Moreover, the time needed to start up the vertical columns is less than for the horizontal ones, whereas in vertical columns, the throughput capacity is higher than in horizontal columns [8].…”

Section: Introductionmentioning

confidence: 99%

“…The determination of these parameters is required to achieve the desired mass transfer rate and to accommodate the desired flows, along with reaching the maximum capacity without flooding. Various models have been developed to predict the mass transfer, such as the axial dispersion model (ADM), the plug flow model (PFM), the mixing stages model (MSM), the forward mixing model (FMM), the back flow model (BFM), and the drop population balance model (DPBM) [3,10,[19][20][21][22][23]. Among these models, the PFM and ADM have been widely implemented for the mass transfer characteristics in extraction columns.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Concentration Profiles in an L‐Shaped Pulsed Extraction Column

et al. 2019

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The L-shaped extraction pulsed plate column is believed to be able to perform under operating conditions between those of the vertical and the horizontal pulsed plate columns. It has an extraction efficiency similar to the vertical pulsed plate column. Here, the mass transfer performance of this novel column type was investigated and the application of three different models, i.e., the plug flow, the axial dispersion, and the back flow models, was evaluated to predict the solute concentration profile along the column length. The water-acetone-n-butyl acetate and the water-acetone-toluene systems were used. The influence of the operational parameters on the height of the mass transfer unit and the back flow coefficients was evaluated using the back flow model. New correlations were proposed to predict the height of the mass transfer unit along with the back flow coefficients in each phase, which were in satisfactory agreement with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of Concentration Profiles in an L‐Shaped Pulsed Extraction Column

et al. 2019

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“…In recent years, a series of studies have been conducted on L‐shaped pulsed columns. Rafiei et al 39 reported experimental results for this type of column under d‐to‐c mass transfer. By applying the axial dispersion model, they showed that the overall volumetric mass‐transfer coefficient in the horizontal region had a positive correlation with the pulse intensity.…”

Section: Introductionmentioning

confidence: 99%

Interfacial relaxation of droplets caused by mass transfer in a pulsed column

Wang,

Zhou,

Zheng

et al. 2024

AIChE Journal

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The method developed in our previous work (Wang et al., AIChE J. 2020; 66(8): e16257), was used to study the influence of the mass‐transfer direction and flux on the dynamic interfacial tension (DIFT) in a pulsed column. The breakup frequency was the highest near the entrance of the dispersed droplet, corresponding to the lowest interfacial tension and highest mass transfer flux. The decrease in the interfacial tension was proportional to the square root of mass‐transfer flux, and this difference is defined as a new parameter, named interfacial relaxation. When the mass‐transfer direction was changed from the dispersed phase to continuous phase to the opposite direction, the proportion of binary breakage was decreased from ~80% to ~40% and the interfacial relaxation was more sensitive to the mass‐transfer flux. A DIFT model was finally established based on the interfacial relaxation parameter, which predicted the experimental results with an error of ±10%.

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Use of axial dispersion and plug flow models for determination of axial mixing and mass transfer coefficient in an l‐shaped pulsed packed extraction column

et al. 2019

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In this study, the volumetric overall mass transfer and phases axial mixing coefficients have been investigated in a pilot plant of an L‐shaped pulsed packed extraction column by using two liquid systems of toluene/acetone/water and n‐butyl/acetone/water. The mass transfer performance has been evaluated using two methods of axial dispersion and a plug flow model. The effect of the operational variables and physical properties, including the dispersed and continuous phases flow rates, pulsation intensity, and interfacial tension, on mass transfer and phases axial mixing coefficients have been considered. It has been found that the pulsation intensity and the continuous phase flow rate seriously affect the mass transfer coefficient, however, the dispersed phase flow rate has a weaker effect. Also, the axial mixing of a phase is strongly affected by the pulsation intensity and the flow rate of the phase itself and it is not affected by the second phase flow rate. Finally, new correlations are proposed to accurately predict the mass transfer and axial mixing coefficients.

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Investigation of mass transfer performance in an L-shaped pulsed sieve plate extraction column using axial dispersion model

Cited by 20 publications

References 59 publications

Prediction of Concentration Profiles in an L‐Shaped Pulsed Extraction Column

Prediction of Concentration Profiles in an L‐Shaped Pulsed Extraction Column

Interfacial relaxation of droplets caused by mass transfer in a pulsed column

Use of axial dispersion and plug flow models for determination of axial mixing and mass transfer coefficient in an l‐shaped pulsed packed extraction column

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