The investigation of mass transfer coefficients in a pulsed regular packed column applying SiO2 nanoparticles

Moghadam, Ensiyeh Hosseini; Bahmanyar, Hossein; Heshmatifar, Fatemeh; Kasaie, Maryam; Ziaei-Azad, Hessam

doi:10.1016/j.seppur.2016.11.044

Cited by 19 publications

(6 citation statements)

References 15 publications

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“…Since the Newman, Kornig–Brink, and Handlos–Baron equations have a significant theoretical basis, the experimental results were compared with the results of these equations, and then a comparison between the experimental results and the recent studies was conducted. [ 15,27,51,55,56 ]…”

Section: Resultsmentioning

confidence: 99%

“…Since the Newman, Kornig-Brink, and Handlos-Baron equations have a significant theoretical basis, the experimental results were compared with the results of these equations, and then a comparison between the experimental results and the recent studies was conducted. [15,27,51,55,56] 3.3.3 | Comparison of experimental and theoretical mass transfer coefficient and the effect of pulse intensity, dispersed phase flow rate, and continuous phase height parameters on them According to Figure 4, the increase in the dispersed phase flow rate and the continuous phase height, the mass transfer improves and increases the mass transfer coefficient. Due to the reduction of the particle size, the pulse intensity has a negative effect on the mass transfer coefficient.…”

Section: Calculation Of Theoretical Mass Transfer Coefficientmentioning

confidence: 99%

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Mass transfer performance of pulsed disk and doughnut column (PDDC) in the extraction of active ingredients in peppermint extract obtained by hot percolation

Hosseini,

Bahmanyar,

Rahimpour

et al. 2024

Can J Chem Eng

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The active ingredients in peppermint are widely used in the pharmaceutical, food, cosmetic, and other industries. The traditional methods for producing peppermint extract through hydrodistillation (HD) and percolation are long process with low efficiency. The aim of this study is the improvement of the extraction performance and the efficiency of the extract obtained from hot percolation via pulsed disk and doughnut columns (PDDC), which is one of the most important pieces of liquid–liquid extraction (LLE) equipment. Peppermint extract was used as the continuous phase in the PDDC. n‐Hexane was considered as the dispersed phase in this column. In this study, the effects of three operating parameters were investigated, including the pulse intensity, continuous phase height, and dispersed phase flow rate, on the extraction efficiency of active ingredients in peppermint. The response surface method (RSM) was used to investigate the effect of these parameters on the extraction efficiency. The efficiency of this column in the extracting of active ingredients from peppermint was measured by UV–vis spectrophotometry, via the absorption rate of the main active ingredients of peppermint (menthol) in the samples, and the efficiency was 75% on average. The experimental and theorical of dispersed phase mass transfer coefficient were evaluated and compared. The results showed that the PDDC improved the extraction and mass transfer. By increasing the flow rate of the dispersed phase and the height of the continuous phase, the extraction efficiency and the mass transfer coefficient were increased.

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Section: Resultsmentioning

confidence: 99%

Section: Calculation Of Theoretical Mass Transfer Coefficientmentioning

confidence: 99%

Mass transfer performance of pulsed disk and doughnut column (PDDC) in the extraction of active ingredients in peppermint extract obtained by hot percolation

Hosseini,

Bahmanyar,

Rahimpour

et al. 2024

Can J Chem Eng

Self Cite

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“…The hydrodynamic performance of a pulsed packed column was studied by Moghadam et al [107], who investigated the drop size variation versus pulsation intensity in this class of extraction columns in the presence of different amounts of SiO 2 nanoparticles. They found that increasing pulsation intensity significantly decreases the mass transfer in both the absence and presence of nanoparticles.…”

Section: Effect Of Nanoparticles On Droplets Behaviormentioning

confidence: 99%

“…Accordingly, the presence of nanoparticles increases the internal mixing inside the droplets, which has a destructive influence on the stability of the droplets. Thus, this destructive 31 influence would dominate the stabilizing influence of the interfacial tension force and lead to a higher breakage rate and the formation of smaller droplets [107].…”

Section: Effect Of Nanoparticles On Droplets Behaviormentioning

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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“…Especially, it will help to predict the residence time and drop size in single drop systems, which are the main parameters that influence the mass transfer coefficient and stage efficiencies. Although a swarm of droplets rather than single droplets exists in large industrial systems, deep understanding of this phenomenon will help in the design of large liquid-liquid extraction columns (Asadollahzadeh et al, 2011;Huang et al, 2016, andTorab-Mostaedi et al, 2011), with the new developed methods in order to enhance mass transfer (Goodarzi and Esfahany, 2016;Moghadam et al, 2017;Rahbar-Kelishami et al, 2015;Saien and Daliri, 2012). Due to the presence of contaminants and surface-active agents in the experimental studies, there are limitations on obtaining more precise results and, in some cases, requires very clean systems (Bäumler et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Vof Simulation of Single Rising Drops in Three Liquid-Liquid Extraction Systems Using CSF and CSS Interfacial Force Models

Roshdi

Kasiri

Rahbar-Kelishami

2018

Braz. J. Chem. Eng.

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In liquid-liquid extraction contractors, mass transfer and stage efficiency are closely related to drop hydrodynamics. In the present study, hydrodynamic simulation of three standard liquid-liquid extraction systems recommended by the EFCE (European Federation of Chemical Engineering) has been investigated. Toluene/water, n-butyl acetate/water, and n-butanol/water with different drop diameters were considered in the simulations, representing systems with high, medium, and low interfacial tension respectively. In the current research, for the first time simulations have been carried out using the VOF-PLIC (Volume of Fluid-Piecewise Linear Interface Calculation) model, implementing two surface tension force models of CSS (Continuum Surface Stress) and CSF (Continuum Surface Force) as a source term in the momentum equation. Simulations have been carried out in an axisymmetric geometry with a moving droplet in the static zone. The stages of droplet acceleration, deformation, and stability in terms of shape and velocity have been captured through simulations. Simulation results show that the average relative error reduces by using the CSS model and the most enhanced effect is observed in the toluene/water system, followed by the n-butyl acetate/water and n-butanol/water systems, respectively. This is due to higher parasitic current effects in the highest surface tension system (toluene/water). The onset of oscillations in the toluene/water system was correctly predicted by the CSS model, while the CSF model could not. Droplet shapes, aspect ratio, terminal and transient velocity and streamlines were also reported in the two surface tension models and compared.

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The investigation of mass transfer coefficients in a pulsed regular packed column applying SiO2 nanoparticles

Cited by 19 publications

References 15 publications

Mass transfer performance of pulsed disk and doughnut column (PDDC) in the extraction of active ingredients in peppermint extract obtained by hot percolation

Mass transfer performance of pulsed disk and doughnut column (PDDC) in the extraction of active ingredients in peppermint extract obtained by hot percolation

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

Vof Simulation of Single Rising Drops in Three Liquid-Liquid Extraction Systems Using CSF and CSS Interfacial Force Models

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