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Mohammad Hassan Mallah - One of the best experts on this subject based on the ideXlab platform.
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investigation of mass transfer performance in an l shaped pulsed sieve plate extraction column using Axial Dispersion model
Chemical Engineering Research & Design, 2017Co-Authors: Vahid Rafiei, Jaber Safdari, Sadegh Moradi, Pouria Amani, Mohammad Hassan MallahAbstract:Abstract This research revolves studying the mass transfer performance of an L-shaped pulsed sieve-plate extraction column using the Axial Dispersion model (ADM) for two chemical systems: water–acetone–toluene and water–acetone-butyl acetate with mass transfer d → c direction. The effects of operating parameters including pulsation intensity and flow rates of the dispersed and the continuous phases on the mass transfer performance are evaluated. According to the results, incrementing pulsation intensity increases the volumetric overall mass transfer coefficients in the horizontal section, whereas it slightly decreases the mass transfer coefficients in the vertical section. Furthermore, the Axial Dispersion coefficient of each phase is found to be mainly affected by the pulsation intensity and the flow rate of the phase itself. The continuous phase Axial Dispersion is found to be significantly higher than that of the dispersed phase. Finally, new empirical correlations are proposed for predicting the overall mass transfer and Axial Dispersion coefficients.
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mass transfer studies in a horizontal pulsed sieve plate column for uranium extraction by tri n octylamine using Axial Dispersion model
Progress in Nuclear Energy, 2017Co-Authors: Pouria Amani, Jaber Safdari, Ahmad Gharib, Hossein Badakhshan, Mohammad Hassan MallahAbstract:Abstract In this work, uranium extraction from an aqueous sulfate solution with 0.25M concentration acid, by using 5% v/v tri-n-octylamine (TOA) solvent, 90% v/v kerosene diluent and 5% v/v decanol modifier is studied. The effect of operation parameters (i.e., phase flow rates and pulsation intensity) on the volumetric overall mass transfer coefficients and Axial Dispersion in a horizontal pulsed sieve-plate column is evaluated using Axial Dispersion model (ADM). According to the results, increasing pulsation intensity and phase flow rates leads to the enhancement of the mass transfer performance. The continuous phase Axial Dispersion is found to be significantly higher than that in the dispersed phase. 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. The overall height of mass transfer unit ( HTU oc ) is obtained to be less than 0.2 m, indicating high performance of a horizontal pulsed sieve-plate column for solvent extraction of uranium. Furthermore, new correlations are proposed for prediction of K oc a , E c and E d , which are in satisfactory agreement with the experimental data with AARE values of 1.03%, 3.35% and 1.89% respectively.
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modeling and simulation of a horizontal pulsed sieve plate extraction column using Axial Dispersion model
Separation Science and Technology, 2017Co-Authors: Farhad Panahinia, Jaber Safdari, Pouria Amani, Mohammad Ghannadimaragheh, Mohammad Hassan MallahAbstract:ABSTRACTIn this research, the impact of pulsation intensity and phase flow rates on the volumetric overall mass transfer coefficients based on the continuous phase (Koca) and the Axial Dispersion coefficients of phases in a horizontal pulsed sieve-plate column has been investigated using Axial Dispersion model. The toluene-acetone-water and butyl acetate-acetone-water systems with acetone transfer in both directions were used. In this study, the flow regime transition from pseudo-Dispersion regime to emulsion regime has been characterized. Two new correlations have been proposed for prediction of Koca and Ec.
Jaber Safdari - One of the best experts on this subject based on the ideXlab platform.
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investigation of mass transfer performance in an l shaped pulsed sieve plate extraction column using Axial Dispersion model
Chemical Engineering Research & Design, 2017Co-Authors: Vahid Rafiei, Jaber Safdari, Sadegh Moradi, Pouria Amani, Mohammad Hassan MallahAbstract:Abstract This research revolves studying the mass transfer performance of an L-shaped pulsed sieve-plate extraction column using the Axial Dispersion model (ADM) for two chemical systems: water–acetone–toluene and water–acetone-butyl acetate with mass transfer d → c direction. The effects of operating parameters including pulsation intensity and flow rates of the dispersed and the continuous phases on the mass transfer performance are evaluated. According to the results, incrementing pulsation intensity increases the volumetric overall mass transfer coefficients in the horizontal section, whereas it slightly decreases the mass transfer coefficients in the vertical section. Furthermore, the Axial Dispersion coefficient of each phase is found to be mainly affected by the pulsation intensity and the flow rate of the phase itself. The continuous phase Axial Dispersion is found to be significantly higher than that of the dispersed phase. Finally, new empirical correlations are proposed for predicting the overall mass transfer and Axial Dispersion coefficients.
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mass transfer studies in a horizontal pulsed sieve plate column for uranium extraction by tri n octylamine using Axial Dispersion model
Progress in Nuclear Energy, 2017Co-Authors: Pouria Amani, Jaber Safdari, Ahmad Gharib, Hossein Badakhshan, Mohammad Hassan MallahAbstract:Abstract In this work, uranium extraction from an aqueous sulfate solution with 0.25M concentration acid, by using 5% v/v tri-n-octylamine (TOA) solvent, 90% v/v kerosene diluent and 5% v/v decanol modifier is studied. The effect of operation parameters (i.e., phase flow rates and pulsation intensity) on the volumetric overall mass transfer coefficients and Axial Dispersion in a horizontal pulsed sieve-plate column is evaluated using Axial Dispersion model (ADM). According to the results, increasing pulsation intensity and phase flow rates leads to the enhancement of the mass transfer performance. The continuous phase Axial Dispersion is found to be significantly higher than that in the dispersed phase. 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. The overall height of mass transfer unit ( HTU oc ) is obtained to be less than 0.2 m, indicating high performance of a horizontal pulsed sieve-plate column for solvent extraction of uranium. Furthermore, new correlations are proposed for prediction of K oc a , E c and E d , which are in satisfactory agreement with the experimental data with AARE values of 1.03%, 3.35% and 1.89% respectively.
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modeling and simulation of a horizontal pulsed sieve plate extraction column using Axial Dispersion model
Separation Science and Technology, 2017Co-Authors: Farhad Panahinia, Jaber Safdari, Pouria Amani, Mohammad Ghannadimaragheh, Mohammad Hassan MallahAbstract:ABSTRACTIn this research, the impact of pulsation intensity and phase flow rates on the volumetric overall mass transfer coefficients based on the continuous phase (Koca) and the Axial Dispersion coefficients of phases in a horizontal pulsed sieve-plate column has been investigated using Axial Dispersion model. The toluene-acetone-water and butyl acetate-acetone-water systems with acetone transfer in both directions were used. In this study, the flow regime transition from pseudo-Dispersion regime to emulsion regime has been characterized. Two new correlations have been proposed for prediction of Koca and Ec.
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Axial mixing and mass transfer investigation in a pulsed packed liquid liquid extraction column using plug flow and Axial Dispersion models
Chemical Engineering Research & Design, 2012Co-Authors: Auob Safari, Jaber Safdari, Hossein Abolghasemi, Mostafa Forughi, Mahnaz MoghaddamAbstract:Abstract In this research work, the volumetric overall mass transfer coefficient based on continuous-phase (Koca) and Axial Dispersion coefficients of phases (Ec, Ed) in a pilot Pulsed Packed Liquid Extraction Column (PPLEC) have been studied using plug flow model (PFM) and Axial Dispersion model (ADM). Experiments have been carried out using standard systems of water/acetone/toluene and water/acetone/n-butyl–acetate. Values of Koca evaluated by ADM are greater than those of PFM by about 20% indicating that the Axial mixing lowers the performance of PPLEC. It was found that the drop-size distribution is the main cause of the Axial mixing in PPLEC. Increase in dispersed phase flow rate (Qd), increases all Koca, Ed and Ec and the minimum values of both Ed and Ec and the maximum values of Koca are in pulse intensity ranges of 0.8–1 cm/s. Finally, three empirical correlations are proposed for the prediction of these parameters which are in good agreement with the experimental data.
Pouria Amani - One of the best experts on this subject based on the ideXlab platform.
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investigation of mass transfer performance in an l shaped pulsed sieve plate extraction column using Axial Dispersion model
Chemical Engineering Research & Design, 2017Co-Authors: Vahid Rafiei, Jaber Safdari, Sadegh Moradi, Pouria Amani, Mohammad Hassan MallahAbstract:Abstract This research revolves studying the mass transfer performance of an L-shaped pulsed sieve-plate extraction column using the Axial Dispersion model (ADM) for two chemical systems: water–acetone–toluene and water–acetone-butyl acetate with mass transfer d → c direction. The effects of operating parameters including pulsation intensity and flow rates of the dispersed and the continuous phases on the mass transfer performance are evaluated. According to the results, incrementing pulsation intensity increases the volumetric overall mass transfer coefficients in the horizontal section, whereas it slightly decreases the mass transfer coefficients in the vertical section. Furthermore, the Axial Dispersion coefficient of each phase is found to be mainly affected by the pulsation intensity and the flow rate of the phase itself. The continuous phase Axial Dispersion is found to be significantly higher than that of the dispersed phase. Finally, new empirical correlations are proposed for predicting the overall mass transfer and Axial Dispersion coefficients.
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mass transfer studies in a horizontal pulsed sieve plate column for uranium extraction by tri n octylamine using Axial Dispersion model
Progress in Nuclear Energy, 2017Co-Authors: Pouria Amani, Jaber Safdari, Ahmad Gharib, Hossein Badakhshan, Mohammad Hassan MallahAbstract:Abstract In this work, uranium extraction from an aqueous sulfate solution with 0.25M concentration acid, by using 5% v/v tri-n-octylamine (TOA) solvent, 90% v/v kerosene diluent and 5% v/v decanol modifier is studied. The effect of operation parameters (i.e., phase flow rates and pulsation intensity) on the volumetric overall mass transfer coefficients and Axial Dispersion in a horizontal pulsed sieve-plate column is evaluated using Axial Dispersion model (ADM). According to the results, increasing pulsation intensity and phase flow rates leads to the enhancement of the mass transfer performance. The continuous phase Axial Dispersion is found to be significantly higher than that in the dispersed phase. 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. The overall height of mass transfer unit ( HTU oc ) is obtained to be less than 0.2 m, indicating high performance of a horizontal pulsed sieve-plate column for solvent extraction of uranium. Furthermore, new correlations are proposed for prediction of K oc a , E c and E d , which are in satisfactory agreement with the experimental data with AARE values of 1.03%, 3.35% and 1.89% respectively.
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modeling and simulation of a horizontal pulsed sieve plate extraction column using Axial Dispersion model
Separation Science and Technology, 2017Co-Authors: Farhad Panahinia, Jaber Safdari, Pouria Amani, Mohammad Ghannadimaragheh, Mohammad Hassan MallahAbstract:ABSTRACTIn this research, the impact of pulsation intensity and phase flow rates on the volumetric overall mass transfer coefficients based on the continuous phase (Koca) and the Axial Dispersion coefficients of phases in a horizontal pulsed sieve-plate column has been investigated using Axial Dispersion model. The toluene-acetone-water and butyl acetate-acetone-water systems with acetone transfer in both directions were used. In this study, the flow regime transition from pseudo-Dispersion regime to emulsion regime has been characterized. Two new correlations have been proposed for prediction of Koca and Ec.
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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study on dispersed phase Axial Dispersion in an agitated pulsed solvent extraction column with a step tracer injection technique
Industrial & Engineering Chemistry Research, 2021Co-Authors: Boren Tan, Yanlin Zhang, Yong WangAbstract:In this work, the residence time distribution (RTD) of the dispersed phase (aqueous phase) and continuous phase (organic phase) in an agitated-pulsed extraction column (APC) was measured online with a step tracer injection technique and the Axial Dispersion was subsequently calculated via RTD analysis. It was found that both the agitation speed and the pulsation intensity had noticeable effects on the Axial Dispersion of the dispersed phase, which escalates with the increase in the agitation speed and this is especially authentic at high pulsation intensity. The dispersed-phase Axial Dispersion coefficient also becomes higher with the increase in the dispersed-phase velocity. Compared with the dispersed-phase Axial Dispersion in the APC, the continuous-phase Axial Dispersion is 2-3 times higher. Empirical equations have been proposed to correlate the dispersed- and continuous-phase Axial Dispersion coefficients for variation of both agitation and pulsation conditions in APC. This study could be valuable for assessing the dispersed-phase Axial Dispersion in liquid-liquid extraction columns.
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comparison of the Axial Dispersion performance of pulsed solvent extraction columns with tenova pulsed column kinetics internals and standard disc and doughnut internals
Solvent Extraction and Ion Exchange, 2018Co-Authors: Yong Wang, Kathryn H Smith, Kathryn A Mumford, Geoffrey W StevensAbstract:Axial Dispersion performance of a 2-m high 76-mm diameter pilot-scale pulsed solvent extraction column has been studied using two liquid–liquid systems, Alamine 336/isodecanol/Shellsol 2046...
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Axial Dispersion in a pulsed and nonpulsed disc and doughnut solvent extraction column
Industrial & Engineering Chemistry Research, 2017Co-Authors: Yong Wang, Kathryn H Smith, Kathryn A Mumford, Geoffrey W StevensAbstract:In solvent extraction columns mechanical agitation is usually introduced to improve the extraction efficiency. However, some industrial columns have been found to have higher extraction efficiency while running with no pulsation. In this study, Axial Dispersion coefficients in the continuous phase were measured under pulsing and nonpulsing conditions using a 72.5 mm diameter disc and doughnut solvent extraction column. The Axial Dispersion coefficients were measured using the unsteady tracer injection method. Under nonpulsing conditions, the Axial Dispersion coefficient increased with increasing continuous phase velocity, but it did not change significantly with the increase of the dispersed phase velocity. With increasing pulsation intensity, the Axial Dispersion coefficient increased. A correlation is proposed to predict the continuous phase Axial Dispersion coefficient in a pulsing and nonpulsing disc and doughnut solvent extraction column.
Geoffrey W Stevens - One of the best experts on this subject based on the ideXlab platform.
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comparison of the Axial Dispersion performance of pulsed solvent extraction columns with tenova pulsed column kinetics internals and standard disc and doughnut internals
Solvent Extraction and Ion Exchange, 2018Co-Authors: Yong Wang, Kathryn H Smith, Kathryn A Mumford, Geoffrey W StevensAbstract:Axial Dispersion performance of a 2-m high 76-mm diameter pilot-scale pulsed solvent extraction column has been studied using two liquid–liquid systems, Alamine 336/isodecanol/Shellsol 2046...
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Axial Dispersion in a pulsed and nonpulsed disc and doughnut solvent extraction column
Industrial & Engineering Chemistry Research, 2017Co-Authors: Yong Wang, Kathryn H Smith, Kathryn A Mumford, Geoffrey W StevensAbstract:In solvent extraction columns mechanical agitation is usually introduced to improve the extraction efficiency. However, some industrial columns have been found to have higher extraction efficiency while running with no pulsation. In this study, Axial Dispersion coefficients in the continuous phase were measured under pulsing and nonpulsing conditions using a 72.5 mm diameter disc and doughnut solvent extraction column. The Axial Dispersion coefficients were measured using the unsteady tracer injection method. Under nonpulsing conditions, the Axial Dispersion coefficient increased with increasing continuous phase velocity, but it did not change significantly with the increase of the dispersed phase velocity. With increasing pulsation intensity, the Axial Dispersion coefficient increased. A correlation is proposed to predict the continuous phase Axial Dispersion coefficient in a pulsing and nonpulsing disc and doughnut solvent extraction column.
