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Effects of surface-active agents on mass transfer of a solute into single buoyancy driven drops in solvent extraction systems
Alternative TitleChem. Eng. Sci.
Li, XJ; Mao, ZS; Fei, WY
2003-08-01
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume58Issue:16Pages:3793-3806
AbstractNumerical simulation was made of transient mass transfer to a surfactant contaminated buoyancy-driven drop controlled by appreciable resistance in both liquid phases. For this purpose, the momentum equations were formulated and solved in a boundary-fitted orthogonal coordinate system. On the basis of resolved hydrodynamics of the contaminated drop, the transient mass transfer was formulated and solved in the same coordinate system. In order to check the applicability of the numerical scheme, single drop extraction experiments were conducted in a totally closed droplet file column with the terminal effect efficiently eliminated. The MIBK-acetic acid-water system was used with small quantities of SDS (sodium dodecyl sulphate), Triton X-100, or Tween 80 introduced into the continuous phase. For these experimental cases, the flow field and the drag coefficient of a contaminated drop were simulated first. The numerical prediction of the drag coefficient is found in good agreement with the corresponding experimental data. It illustrates that the behavior of a drop approaches that of a rigid sphere and that about 100 times higher bulk concentration of SDS than that of Triton X-100 is required for the same extent contamination of a MIBK drop of the same size. Then the information of the flow field of a contaminated MIBK drop was used in simulating the transient mass transfer of solute into the drop. The resulted extraction fraction and overall mass transfer coefficient are in reasonable coincidence with the experimental data. Both numerical results and experimental data show that overall mass transfer coefficient of a heavily contaminated drop is only about one third of that in the pure system. This can be explained well by the distribution of the local Sherwood number, which drops down abruptly along the rear stagnant surface. Also the interfacial resistance of adsorbed surfactant was incorporated in the mass transfer model and then estimated by the least square fitting the simulation with data. The numerical results also show that Tween 80 presents obvious interfacial resistance on the acetic acid diffusing across the interface, whereas SDS and Triton X-100 show no interfacial resistance. It is suggested that the numerical simulation can be resorted in some solvent extraction systems containing surfactants to conduct numerical experiments and parametric study. (C) 2003 Elsevier Ltd. All rights reserved.; Numerical simulation was made of transient mass transfer to a surfactant contaminated buoyancy-driven drop controlled by appreciable resistance in both liquid phases. For this purpose, the momentum equations were formulated and solved in a boundary-fitted orthogonal coordinate system. On the basis of resolved hydrodynamics of the contaminated drop, the transient mass transfer was formulated and solved in the same coordinate system. In order to check the applicability of the numerical scheme, single drop extraction experiments were conducted in a totally closed droplet file column with the terminal effect efficiently eliminated. The MIBK-acetic acid-water system was used with small quantities of SDS (sodium dodecyl sulphate), Triton X-100, or Tween 80 introduced into the continuous phase. For these experimental cases, the flow field and the drag coefficient of a contaminated drop were simulated first. The numerical prediction of the drag coefficient is found in good agreement with the corresponding experimental data. It illustrates that the behavior of a drop approaches that of a rigid sphere and that about 100 times higher bulk concentration of SDS than that of Triton X-100 is required for the same extent contamination of a MIBK drop of the same size. Then the information of the flow field of a contaminated MIBK drop was used in simulating the transient mass transfer of solute into the drop. The resulted extraction fraction and overall mass transfer coefficient are in reasonable coincidence with the experimental data. Both numerical results and experimental data show that overall mass transfer coefficient of a heavily contaminated drop is only about one third of that in the pure system. This can be explained well by the distribution of the local Sherwood number, which drops down abruptly along the rear stagnant surface. Also the interfacial resistance of adsorbed surfactant was incorporated in the mass transfer model and then estimated by the least square fitting the simulation with data. The numerical results also show that Tween 80 presents obvious interfacial resistance on the acetic acid diffusing across the interface, whereas SDS and Triton X-100 show no interfacial resistance. It is suggested that the numerical simulation can be resorted in some solvent extraction systems containing surfactants to conduct numerical experiments and parametric study. (C) 2003 Elsevier Ltd. All rights reserved.
KeywordSurfactant Drag Coefficient Solvent Extraction Single Drop Numerical Simulation Mass Transfer Experiment
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S0009-2509(03)00237-9
URL查看原文
Indexed BySCI
Language英语
WOS KeywordINTERMEDIATE REYNOLDS-NUMBERS ; NUMERICAL-SIMULATION ; TRANSFER COEFFICIENTS ; QUIESCENT LIQUID ; SPHERICAL BUBBLE ; MOTION ; WATER ; RESISTANCE ; MECHANISM ; STEADY
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000184851900019
Citation statistics
Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5287
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
2.Tsing Hua Univ, State Key Lab Chem Engn, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Li, XJ,Mao, ZS,Fei, WY. Effects of surface-active agents on mass transfer of a solute into single buoyancy driven drops in solvent extraction systems[J]. CHEMICAL ENGINEERING SCIENCE,2003,58(16):3793-3806.
APA Li, XJ,Mao, ZS,&Fei, WY.(2003).Effects of surface-active agents on mass transfer of a solute into single buoyancy driven drops in solvent extraction systems.CHEMICAL ENGINEERING SCIENCE,58(16),3793-3806.
MLA Li, XJ,et al."Effects of surface-active agents on mass transfer of a solute into single buoyancy driven drops in solvent extraction systems".CHEMICAL ENGINEERING SCIENCE 58.16(2003):3793-3806.
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