Two-phase pressure drop and flooding characteristics in a horizontal-vertical pulsed sieve-plate column

Amani, Pouria; Safdari, Jaber; Abolghasemi, Hossein; Mallah, Mohammad Hassan; Davari, Amin

doi:10.1016/j.ijheatfluidflow.2017.01.003

Cited by 32 publications

(9 citation statements)

References 37 publications

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“…In this regard, the novel L-shaped (horizontal-vertical) pulsed sieve-plate column has been proposed in order to potentially achieve greater advantages compared with the other versions. In our previous studies, we have investigated the hydrodynamic behavior of the L-shaped pulsed column [14][15][16]. Generally, the design and optimization of an extraction column require the calculation of two key factors including the required height of the column and the cross-sectional area [17,18].…”

Section: Introductionmentioning

confidence: 99%

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%

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

et al. 2019

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“…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 . Regarding the third category, the horizontal‐vertical pulsed column is a new extraction column that was recently introduced by Akhgar et al and Amani et al The main characteristics of this type in comparison to the horizontal and vertical type are as follows: The capacity of a horizontal‐vertical pulsed column is more than the horizontal and less than the vertical. …”

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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“…1. A great deal of research into the enhancement of extraction performance has been performed, which has led to the development of a class of liquid-liquid contactors in which mechanical agitation is applied to increase the interfacial area between the two liquid phases [2]. One type of liquid-liquid contactors is the pulsed sieve-plate extraction column, which requires external energy input in the form of a pulsing motion (usually sinusoidal) superimposed on the counter-current flow of the liquid phases.…”

Section: Introductionmentioning

confidence: 99%

A critical review on the use of nanoparticles in liquid–liquid extraction

Amani

Ahmadi

et al. 2018

Chemical Engineering Science

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Recently, the use of nanoparticles in extraction columns has gained increasing attention due to their potential to enhance mass transfer processes. Most of the reported work, however, has been concerned with mass transfer enhancement in gas-liquid systems in the presence of nanoparticles, while limited studies of liquid-liquid systems have been reported. Liquidliquid extraction is an extensively employed separation method that has taken on a substantial role in engineering and industrial applications for recovery processes. Therefore, the aim of this review article is to provide an overview of the state-of-the-art from the available literature on the effect of nanoparticles on the hydrodynamic behavior and mass transfer performance of liquid-liquid systems. Attention is also given to providing an understanding of the mechanisms responsible for the improvements in mass transfer with the use of nanoparticles. In the majority of studies, the presence of nanoparticles was found to be beneficial and to lead to improved mass transfer, although a few investigations reported a detrimental impact of nanoparticles. The literature does not clearly describe the conditions under which the addition of nanoparticles would be unfavorable. Moreover, the addition of nanoparticles always introduces potential drawbacks, such as sedimentation, accumulation, or clogging inside extraction columns, as well as the need to separate the nanoparticles at the outlets. These drawbacks have not been considered in the literature, limiting the practical employment of nanoparticles in this industry.

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Two-phase pressure drop and flooding characteristics in a horizontal-vertical pulsed sieve-plate column

Cited by 32 publications

References 37 publications

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

Prediction of Concentration Profiles in an L‐Shaped Pulsed 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

A critical review on the use of nanoparticles in liquid–liquid extraction

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