Mass Transfer and Zeta Potential in Solvent Extraction

Czapla, Christian; Bart, H.‐J.; Jesberger, M.

doi:10.1081/ss-100100233

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…Moreover, the contaminant levels and their types are not fixed and may vary during the operation. The presence of contaminants in mass-transfer systems is known to reduce the mass-transfer coefficient markedly by exerting an excess mass-transfer resistance and has been studied by many investigators. − The role of electrostatic potential and the influence of electrolytes on the reduction of the mass-transfer rate in liquid−liquid systems have been investigated by a number of investigators. − …”

Section: Introductionmentioning

confidence: 99%

Combined Model of Mass-Transfer Coefficients for Clean and Contaminated Liquid−Liquid Systems

Haghdoost

Dehkordi

Darbandi

et al. 2011

Ind. Eng. Chem. Res.

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Mass-transfer rates to and from drops in liquid-liquid extraction processes are often reduced by the presence of contaminants. To design an industrial extractor, it is essential to consider this contamination effect in a quantitative manner. To achieve this goal, an experimental investigation was conducted on the mass transfer into single drops for n-butanol-succinic acidwater, as the recommended test system by the European Federation of Chemical Engineering (EFCE). The effects of anionic (sodium dodecyl sulfate, SDS), cationic (dodecyl trimethyl ammonium chloride, DTMAC), and nonionic (octylphenol decaethylene glycol ether, Triton X-100) surfactants on the hydrodynamic and mass-transfer parameters such as mean drop size, average velocity, and the overall mass-transfer coefficient were thoroughly investigated. On the basis of experimental results, a model for surfactant effect on the mass-transfer coefficient in a system with unknown type and amount of contaminant was presented. This model is especially applicable in industrial processes in which contaminants have unknown sources and types.

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Section: Introductionmentioning

confidence: 99%

Combined Model of Mass-Transfer Coefficients for Clean and Contaminated Liquid−Liquid Systems

Haghdoost

Dehkordi

Darbandi

et al. 2011

Ind. Eng. Chem. Res.

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“…The role of electrostatic potential, particularly in the presence of ionic surfactants, on the mass transfer and the influence of electrolytes on the reduction of mass-transfer rate between two liquid-liquid systems have been investigated by many authors. [20][21][22][23] The excess mass-transfer resistance exerted by the surface-active agents has been attributed to the hydrodynamic effect and/or to the formation of an interfacial barrier layer. The effects of surface-active agents on the hydrodynamic behavior of a moving drop may arise from (1) changes in the internal circulation velocities within the drops, (2) interfacial mobilization, and (3) the inhibition of interfacial movement due to the gradient of interfacial tension along the drop interfacial area.…”

Section: Introductionmentioning

confidence: 99%

“…The ionic surfactants load the interface and change the interfacial concentration of the extractable aqueous species, thus having an effect on the mass transfer of ionic species. The role of electrostatic potential, particularly in the presence of ionic surfactants, on the mass transfer and the influence of electrolytes on the reduction of mass-transfer rate between two liquid−liquid systems have been investigated by many authors. − The excess mass-transfer resistance exerted by the surface-active agents has been attributed to the hydrodynamic effect and/or to the formation of an interfacial barrier layer. The effects of surface-active agents on the hydrodynamic behavior of a moving drop may arise from (1) changes in the internal circulation velocities within the drops, (2) interfacial mobilization, and (3) the inhibition of interfacial movement due to the gradient of interfacial tension along the drop interfacial area. ,,− In addition, the barrier-layer effect, also called the physicochemical effect, has been attributed to the interaction between solute and adsorbed surface-active agents across the interface. ,,− …”

Section: Introductionmentioning

confidence: 99%

Model for Excess Mass-Transfer Resistance of Contaminated Liquid− Liquid Systems

Dehkordi

Ghasemian

Bastani

et al. 2007

Ind. Eng. Chem. Res.

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The prediction of mass-transfer rates into and from moving drops in the liquid−liquid systems has usually used the well-known Whitman two-film theory approach. According to the latter, the total resistance to mass transfer resides on each side of the interface and is described by the individual film mass-transfer coefficients for the continuous and dispersed phases in the absence of surface-active agents (contaminants). In the present work, the same approach has been used to model the excess mass-transfer resistance exerted by surface-active agents in the continuous phase. To achieve this goal, an experimental investigation has been conducted on the mass transfer into and from single drops for the chemical test system, n-butanol−succinic acid−water, recommended by the European Federation of Chemical Engineering (EFCE) in the presence and absence of the anionic surfactant, sodium dodecyl sulfate (SDS). The influence of the latter on the drop size, drop contact time, extraction fraction, viscosity of the continuous phase, and interfacial tension as well as the overall mass-transfer coefficients for both mass-transfer directions has been investigated. On the basis of the experimental results obtained for both mass-transfer directions, the excess mass-transfer resistance exerted by the surfactant has been correlated in terms of drop Reynolds numbers for the clean and contaminated chemical systems.

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Understanding the switchable solvent extraction of phospholipids from dairy byproducts

Rathnakumar

Ortega‐Anaya

Jiménez-Flores

et al. 2021

Food and Bioproducts Processing

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Mass Transfer and Zeta Potential in Solvent Extraction

Cited by 10 publications

References 6 publications

Combined Model of Mass-Transfer Coefficients for Clean and Contaminated Liquid−Liquid Systems

Combined Model of Mass-Transfer Coefficients for Clean and Contaminated Liquid−Liquid Systems

Model for Excess Mass-Transfer Resistance of Contaminated Liquid− Liquid Systems

Understanding the switchable solvent extraction of phospholipids from dairy byproducts

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