A simple flow device for enhanced mass transfer in reduced dimensions

Biswas, Koushik; Ray, Subhabrata; Das, Gargi; Basu, Jayanta Kumar

doi:10.1016/j.cej.2015.05.099

Cited by 16 publications

(9 citation statements)

References 21 publications

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“…Sufficient precautions were taken to ensure that acetic acid remained the single diffusing species from the toluene to the water phase. 35,36,38,39 During experimentation, the two test liquids flowed for some time; then, after the flow patterns were stable, samples for the mass-transfer study were collected from the outlet of the microchannel in a 1.5 mL Eppendorf tube to allow the separation of the two phases by giving some time.…”

Section: Methodsmentioning

confidence: 99%

“…The mass-transfer coefficient increases with a reduction in diameter, which is in agreement with our previous works. 36,37,39 Furthermore, it can be concluded that a reduction in diameter coupled to vibration (frequency of 20 Hz) will give a more enhanced mass-transfer coefficient, significantly contributing to process intensification. The combination of two simple and cost-effective methods could enhance the mass-transfer rates up to 50% more.…”

Section: Effect Of Vibrationmentioning

confidence: 99%

“…To estimate the flow characteristics (length and diameter) of the flow patterns, we calculated the interfacial area by image analysis using PCC software (Phantom). Sufficient precautions were taken to ensure that acetic acid remained the single diffusing species from the toluene to the water phase. ,,, During experimentation, the two test liquids flowed for some time; then, after the flow patterns were stable, samples for the mass-transfer study were collected from the outlet of the microchannel in a 1.5 mL Eppendorf tube to allow the separation of the two phases by giving some time. The refractive index value of the phase taken from the tube was measured by a digital refractometer (range, 1.33 to 1.53; accuracy, ±0.2%).…”

Section: Experimental Sectionmentioning

confidence: 99%

“…In our studies, the overall volumetric mass-transfer coefficient ( k ov a ) was measured from the aqueous phase mass balance (Supporting Information). − The overall volumetric mass-transfer coefficient − is as follows where L is the total length of the test channel, A is the cross-sectional area ( πd 2 /4) of the microchannel (m 2 ), a is the transfer area per unit volume (m 2 /m 3 ), k ov a represents the overall volumetric mass-transfer coefficient (s –1 ), C t and C w are the respective concentrations of acetic acid in toluene (m 3 of acetic acid/m 3 of pure toluene) and water (m 3 of acetic acid/m 3 of pure water) at a distance z from the inlet, C t·in is the inlet concentration of acetic acid in toluene (m 3 of acetic acid/m 3 of pure toluene), C w·in is the inlet concentration of acetic acid in water (m 3 of acetic acid/m 3 of pure water), Q W and Q T represent the volumetric flow rates of water and toluene, respectively, and C w·out denotes the outlet concentration of acetic acid in water (m 3 of acetic acid/m 3 of pure water). m is defined as the slope obtained from the regression of C t and C w * , which is the concentration of acetic acid in water in equilibrium with the bulk concentration of acetic acid in toluene ( C t , solute free basis) calculated by using a nearly linear relationship ( C w * = 4.05 × C t ) based on ternary equilibrium data. ,,, …”

Section: Experimental Sectionmentioning

confidence: 99%

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Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Jaiswal

Kumar

Panda

et al. 2021

Ind. Eng. Chem. Res.

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In recent times, microfluidic systems have emerged due to their multifunctional benefits including a higher degree of process intensification. The existence of the slug flow regime in the microdomain for biphasic flow systems further enhances the mass-transfer characteristics. In this Article, the combination of three enhancing factors, microdimension, slug flow, and mechanical vibration, is presented for a greater degree of process intensification. The effect of mechanical vibration on the hydrodynamics and mass-transfer characteristics of an immiscible liquid–liquid system in a microchannel with an internal diameter of 0.15 and 0.25 mm is investigated. Frequencies of 10 and 20 Hz are used to induce vibration in the microchannel. The result is shown to be a promising enhancement of the mass-transfer coefficient with the introduction of vibration. The range of slug flow is further enhanced due to the introduction of vibration along with a nearly three-fold mass-transfer enhancement owing to the increase in convective mass transport. A vibrational parameter is included in the study to calculate the stretched Reynolds number, which is found to increase with the introduction of vibration. The enhancement of mass transfer is attributed to the change in the flow pattern from a slug-dispersed transition and a slug-annular transition. The advancement of the vibration framework for effective fluid mixing will greatly affect the high-throughput separation process in the drug and fine synthetic industries.

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Section: Methodsmentioning

confidence: 99%

Section: Effect Of Vibrationmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Jaiswal

Kumar

Panda

et al. 2021

Ind. Eng. Chem. Res.

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“…In a study performed by Biswas et al . , the authors were able to utilize a device with a 90° bend pattern to intensify mass transfer controlled processes. This feature enlarged the range of Taylor regime and decreased the range of parallel flow compared to straight conduits, which contributed positively to improved mass transfer.…”

Section: Reasons For Enhanced Safety: Superior Performance Of Microrementioning

confidence: 99%

Application of microfluidics technology in chemical engineering for enhanced safety

et al. 2015

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The unique virtues of microfluidic technology have earned it an important place in a variety of chemical engineering applications. Among advantages including improved selectivity or yield, one crucial yet often neglected one is enhanced safety. Herein, we have critically reviewed latest progress in the study of using microreactors to reduce associated risk when performing experiments. Related research results have been carefully selected and categorized based on the major consideration to employ microfluidic technology, for example, fast heat/mass transfer, tolerance to high pressure, and confinement of toxic materials. Frontiers and remaining challenge of the field have been addressed at the end of this review as well.

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Liquid-liquid extraction for the separation of Co(II) from Ni(II) with Cyanex 272 using a pilot scale Re-entrance flow microreactor

Zhang

Hessel

Peng

2018

Chemical Engineering Journal

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A simple flow device for enhanced mass transfer in reduced dimensions

Cited by 16 publications

References 21 publications

Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Application of microfluidics technology in chemical engineering for enhanced safety

Liquid-liquid extraction for the separation of Co(II) from Ni(II) with Cyanex 272 using a pilot scale Re-entrance flow microreactor

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