Hydrodynamic behaviour of a horizontal pulsed solvent extraction column. part 1: Flow characterization, throughput capacity and holdup

Melnyk, A.; Vijayan, S.; Woods, Donald R.

doi:10.1002/cjce.5450700302

Cited by 24 publications

(20 citation statements)

References 8 publications

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“…9,11,12 However, there are some reasons why horizontal pulsed columns are more desirable than vertical columns, such as their easier maintenance when throughput is high or higher performance in limited areas. 13 However, horizontal pulsed columns have a lower production capacity than vertical columns in the same conditions. As both vertical and horizontal columns have their own advantages and disadvantages, it is important to consider the specic process.…”

Section: -10mentioning

confidence: 99%

Mass transfer investigation in a horizontal–vertical pulsed packed extraction column

et al. 2017

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In this study, hydrodynamic parameters and the mass transfer coefficient were investigated in a pilot version of a horizontal-vertical pulsed packed extraction column using a toluene-acetone-water system. The effects of the operational parameters on the volumetric overall mass transfer coefficient and hydrodynamic parameters away from the flooding point were studied, and it was found that the volumetric overall mass transfer coefficient, mean drop size and disperse phase holdup were significantly affected by the pulse intensity. However, the dispersed and continuous phase flow rates have a weaker effect. On the other hand, by increasing the pulse intensity the mean drop size and volumetric overall mass transfer coefficient were reduced and increased, respectively, in both sections of the column, but the disperse phase holdup displayed different behavior in the horizontal and vertical sections. By increasing the pulse intensity, the disperse phase holdup was first reduced and then increased in the horizontal section; however, an incremental trend was observed in the vertical section. The effect of the dispersed phase flow rate was significant for all the investigated parameters, but weaker. For instance, all the investigated parameters were increased by enhancing the dispersed phase flow rate. In contrast, the continuous phase flow rate has sometimes had no significant effect, for example, on the mean drop size in both sections of the column. Finally, two empirical correlations for the prediction of the volumetric overall mass transfer coefficient based on the continuous phase were derived in terms of the Sherwood number, Reynolds number and other dimensionless numbers. Good agreement between predictions and experiments was found for all operating conditions that were investigated.

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Section: -10mentioning

confidence: 99%

Mass transfer investigation in a horizontal–vertical pulsed packed extraction column

et al. 2017

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“…[4][5][6][7] However, horizontal pulsed columns are more desirable than the vertical for reasons such as the facility of maintenance when the activity is high or for indoor application when height is limited. [8] According to Vdovenko and Kulikov, [9] mass transfer performance in a horizontal column is analogous to that in a vertical column. However, the production capacity in a horizontal pulsed column is lower than that in a vertical column in the same conditions and it requires more time to reach a steady state as well.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have investigated the effects of operational variables, the physical properties of the chemical systems, and the geometrical parameters of the column on the mass transfer performance in the pulsed extraction column, and various correlations are presented to predict the mass transfer coefficient. [4,8,[14][15][16][17][18] However, based on a review carried out by Yadav and Patwardhan, [3] the correlation that is proposed for one system is not recommended for other columns with different sizes or other chemical systems. Therefore, further investigation is necessary in order to determine a unified approach to predict the mass transfer rate in such columns.…”

Section: Introductionmentioning

confidence: 99%

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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“…[18] The working regimes in the pulsed extraction columns have been the aim of various experimental investigations. [19][20][21][22][23][24][25] According to the literature, for a constant flow rate of liquid phases, there are three stable regimes including mixer-settler, dispersion, and emulsion regimes and one unstable operating regime which was thoroughly discussed by Yadav and Patwardhan. [8] On the other hand, regarding to propose a correlation for prediction of the transition between regimes, a large number of investigations have been made and various correlations for regime transition in extraction columns are proposed.…”

mentioning

confidence: 99%

“…[8] On the other hand, regarding to propose a correlation for prediction of the transition between regimes, a large number of investigations have been made and various correlations for regime transition in extraction columns are proposed. [4,17,[25][26][27][28][29][30][31][32] Moreover, the applicability of computational fluid dynamics (CFD) and population balance equation (PBE) has been investigated for the simulation of drop behaviour in the column in various studies. [33,34] Among the various types of extraction columns, the L-shaped pulsed sieve-plate column is a novel type of extractor whose application for extraction, separation, and purification of rare earth elements has not been referred to in the literature.…”

mentioning

confidence: 99%

Drop behaviour characteristics in different operating regimes in an L‐shaped pulsed sieve‐plate column

Amani¹,

Esmaieli²

2017

Can J Chem Eng

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In this study, the influence of different operating regimes on drop behaviour in an L-shaped pulsed sieve-plate column has been investigated and the effects of pulsation intensity and phase superficial velocities on drop diameters are evaluated. The toluene-water system with 0.03 L/L (3 vol%) acetone as a mass transfer agent is used. Experimental observations reveal that with increasing pulsation intensity, drop sizes slightly decrease and by reaching to the end of mixer-settler regime, they significantly decrease followed by a mild decrease in the dispersion regime. Moreover, it is observed that mean drop size firstly varies inversely as both phase superficial velocities change, while it slightly increases with further increase in superficial velocities. Finally, some of the most recommended correlations are compared to the experimental data. It is revealed that these correlations show the highest deviation in the lower end of the mixer-settler regime (> 40 %), while in the dispersion regime it becomes < 15 %, indicating that they are only applicable in the region of practical regimes. Accordingly, two of these correlations are modified in order to cover different operating regimes by means of two correlations proposed to predict the transition regime in each section of the column. The AARE values of the modified correlations are found to be < 14.7 %.

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Hydrodynamic behaviour of a horizontal pulsed solvent extraction column. part 1: Flow characterization, throughput capacity and holdup

Cited by 24 publications

References 8 publications

Mass transfer investigation in a horizontal–vertical pulsed packed extraction column

Mass transfer investigation in a horizontal–vertical pulsed packed extraction 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

Drop behaviour characteristics in different operating regimes in an L‐shaped pulsed sieve‐plate column

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