Journal ArticleDOI
Applying forward mixing model in an L-shape pulsed packed extraction column to investigate the influence of drop size distribution on mass transfer
TLDR
In this article, the effect of drop size distribution on the mass transfer efficiency of a two-phase countercurrent extraction process was investigated in a pilot plant of L-shape pulsed packed extraction column.Abstract:
The objective of this work is to model the effect of drop forward-mixing on the mass transfer efficiency of a two phase countercurrent extraction process. Based on the flow mechanism and drop size distribution in extraction columns, a novel model with a simplified sequential algorithm is developed. Unlike the other models that use mean diameter of the dispersed phase droplets, this model accurately considered the effect of drop size distribution on mass transfer efficiency. On the base of this model the volumetric overall mass transfer coefficient has been investigated in a pilot plant of L-shape pulsed packed extraction column by using two liquid systems of toluene/acetone/water and butyl acetate/acetone/water. It is found that, although the mass transfer coefficient related to the large droplets is larger but the corresponding volumetric overall mass transfer coefficient is less than that related to the small droplets. Therefore, any factor that reduces the drop size can improve the efficiency of mass transfer. Furthermore, the effect of operational variables and physical properties including the dispersed and continuous phases flow rates, pulsation intensity and interfacial tension have been considered on mass transfer coefficients. It has been found out that the pulsation intensity and the continuous phase flow rate have seriously affected on mass transfer coefficient, however, the dispersed phase flow rate has a weaker effect. Finally, new correlations are proposed to accurately predict the mass transfer coefficient, axial mixing and drop size distribution. Good agreement between predictions and experiments was found for all operating conditions that were investigated.read more
Citations
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Journal ArticleDOI
Experimental and modeling investigation of cobalt ion extraction in multistage extractor: Efficient evaluation of mass transfer coefficients using forward mixing approach
TL;DR: In this article, the authors developed comprehensive mass transfer models such as the plug flow model (PFM), backflow model (BFM), axial dispersion model (ADM), and forward mixing model (FMM).
Journal ArticleDOI
A novel model for mass transfer evaluation in horizontal pulsed column by coupling the effects of dispersed phase non-uniformity and continuous phase back mixing
TL;DR: In this article, the authors developed a novel model by coupling the effects of backflow mixing in the continuous phase and non-uniform distribution in the dispersed phase to evaluate the mass transfer performance of a horizontal pulse sieve-plate column (HPSPC).
Journal ArticleDOI
Microdroplet-based continuous countercurrent extraction with high phase ratio
TL;DR: In this paper , a microdroplet-based continuous countercurrent extraction process with a high phase ratio (60-110) was proposed, and a microdisperser and a milli-scale column was established, and the effects of the experimental parameters, namely, the circulation ratio, flow rate, phase ratio, and column length, on the extraction efficiency, volumetric mass transfer coefficient, and theoretical stage were studied.
Journal ArticleDOI
Experimental investigation on dispersed phase holdup in an L-shape pulsed packed extraction column
TL;DR: In this article, the authors investigated the effect of operational variables, physical properties and mass transfer direction on the dispersed phase hold-up in a pilot plant of a new type of extraction column entitled "L-shaped pulsed packed extraction column".
Journal ArticleDOI
Determination of mass transfer coefficient in an L-shaped pulsed column with sieve-plate structure: Application of best-fit technique, drop size distribution, and forward mixing model
Mojtaba Saremi,Rezvan Torkaman,Jaber Safdari,Vahid Rafiei,Mohammad Hassan Mallah,Mehdi Asadollahzadeh +5 more
TL;DR: In this paper, the performance of an L-shaped pulsed sieve-plate column (LPSPC) was studied using the forward mixing model (FMM) and a real code using the best-fit technique and PSO algorithm was developed for finding the optimal values of axial dispersion and overall mass transfer coefficients.
References
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Journal ArticleDOI
Drop size distribution and mean drop size in a pulsed packed extraction column
TL;DR: In this article, the drop size distribution and Sauter mean drop diameter have been investigated using three different liquid systems in the absence of mass transfer in a pilot plant pulsed packed column.
Journal ArticleDOI
Axial mixing and mass transfer investigation in a pulsed packed liquid–liquid extraction column using plug flow and axial dispersion models
TL;DR: In this paper, the volumetric overall mass transfer coefficient based on continuous-phase (K oc a ) and axial dispersion coefficients of phases (E c, E d ) in a pilot Pulsed Packed Liquid Extraction Column (PPLEC) have been studied using plug flow model (PFM) and axIAL dispersion model (ADM), and three empirical correlations are proposed for the prediction of these parameters which are in good agreement with the experimental data.
Journal ArticleDOI
Mass transfer studies in a horizontal pulsed sieve-plate column for uranium extraction by tri-n-octylamine using axial dispersion model
TL;DR: In this paper, the axial dispersion of a phase is found to be mostly influenced by pulsation intensity and the flow rate of the phase itself and is minor influenced by the second phase flow rate.