Liquid–liquid two‐phase mass transfer in the T‐junction microchannels

Zhao, Yuchao; Chen, Guangwen; Yuan, Quan

doi:10.1002/aic.11333

Cited by 208 publications

(174 citation statements)

References 33 publications

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“…As is known, the total superficial flow rate of the two immiscible liquid-liquid phases in the microchannel is inversely proportional to the residence time. k aq a and k oil a increased with increasing Re M (or flow rate) in accordance with our previous research work [9,14], and this is mainly due to the increase in the interface interaction of the two immiscible fluids. In addition, the interface of the two immiscible fluids can be stretched, folded and distorted.…”

Section: Identification Of the Controlling Factor For The Extraction supporting

confidence: 76%

Section: Theoretical Considerationsmentioning

confidence: 99%

“…Gothsch et al [13] investigated the effects of the microchannel geometry in the two processes of highpressure dispersion and emulsification. Zhao et al [14] studied the mass transfer characteristics of the immiscible liquid-liquid two-phase flow in T-junction microchannels. It was found that the overall volumetric mass transfer coefficients of the microchannels were two or three orders of magnitude higher than those of conventional liquid-liquid contactors.…”

Section: Introductionmentioning

confidence: 99%

“…The Reynolds number is also an important parameter, which is always used to describe the hydrodynamics in microchannels. On the basis of our previous experimental results [9,14], the Reynolds numbers of the two immiscible phases can be calculated by the following equations:where D e , S, Q aq , Q oil , U M , q M , l M , and h aq are the hydraulic diameter of the microchannel, the cross-sectional area of the microchannel, the volumetric flow rate of the aqueous phase, the volumetric flow rate of the oil phase, the total superficial flow rate of the two immiscible liquid-liquid phases, the mixture density, the mixture viscosity, and the volume fraction of the aqueous phase in the two phases, respectively. Due to the unknown effective interfacial area between the immiscible phases in the extraction, the apparent overall volumetric mass transfer coefficients (k app a) can be calculated from the experimental results.…”

mentioning

confidence: 99%

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A comparison of efficiency and accuracy of two-electron integrals calculation between two methods in multi-configuration time-dependent hartree fock frame

Han

2013

J Math Chem

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The extraction performance in a T-junction microchannel was investigated experimentally. CuSO 4 /H 2 SO 4 /AD-100/260 # solvent oil was chosen as the working system. The velocities of the aqueous and oil phases were varied from 0.0016 to 0.45 m s -1 , with Re M varying between 9 and 200. The experimental results show that the extraction process of copper in the microchannel is controlled by both reaction intrinsic kinetics and mass transfer, depending on the characteristics of the reaction and the fluid hydrodynamics. The maximum extraction efficiency is about 0.96, and the apparent overall volumetric mass transfer coefficient (k app a) is in the range of 0.02-0.2 s -1 . In addition, the effects of the Cu 2+ concentration and the pH in the aqueous phase, the volumetric fraction of AD-100 in the oil phase, and the temperature on the extraction performance were investigated in detail. IntroductionLiquid-liquid extraction, which is also known as solvent extraction, is widely utilized in the process industries such as the petroleum, food, hydrometallurgy and chemical industries, and others. The extraction of copper is a representative process in the hydrometallurgy industry. The introduction of the LIX series extractants by General Mills Company was an exciting innovation for the copper mining industry, creating a great interest in the process of liquid-liquid extraction accompanying chemical reactions [1]. The extraction has been carried out in different contactors, such as the mixer-settler contactors, column contactors, etc. The mixer-settler [2] is free of backmixing between different stages and can be operated under nearly equilibrium conditions between the two phases. However, its recycling solvent and the energy consumption for mechanical stirring are very large. Besides, it requires large space for allocation. Extraction columns, such as sieve plate, pulsed, spray and rotating-disc columns, etc., have also been widely employed [3,4]. Although these contactors benefit from a simple structure, their utilization is limited due to extreme backmixing, which greatly reduces the extraction efficiency. Moreover, some other contactors are also exploited for extraction processes. Doungdeethaveeratana and Sohn [5] studied the extraction kinetics in a cylindrical vessel, and a high dispersion performance of the two immiscible liquid-liquid phases could be obtained by gas agitation so that better extraction efficiency was generated. Merchuk et al. [6] experimentally investigated copper extraction with LIX-64N by means of motionless mixing, and an approximate 92 % of equilibrium was achieved in the Koch static mixer. Nevertheless, some disadvantages still exist in these contactors, such as rigorous operating conditions, long extraction times, small overall volumetric mass transfer coefficients, etc.Microchemical engineering technology, as one of the most important process intensification modes, has been in the focus of industry and academia [7][8][9][10][11][12]. The extremely large surfaceto-volume ratio and the short t...

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Section: Identification Of the Controlling Factor For The Extraction supporting

confidence: 76%

Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A comparison of efficiency and accuracy of two-electron integrals calculation between two methods in multi-configuration time-dependent hartree fock frame

Han

2013

J Math Chem

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“…Different liquid-liquid phase flow patterns in micro-channels have been experimentally analysed, see Dessimoz et al [5]. Recently, Zhao et al [16] studied mass transfer behaviour in a stainless steel micro-channel with a T-junction inlet under cross flow and opposing flow configurations. In Burns and Ramshaw [2] an immiscible liquid-liquid two phase flow system was analysed and the system was found to show stratified flow with a planar interface for a wide range of operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of laminar and plug flow-fields on extraction performance in micro-channels

Malengier¹,

Tamalapakula²,

Pushpavanam³

2012

Chemical Engineering Science

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Several applications such as liquid-liquid extraction in micro-fluidic devices are concerned with the flow of two immiscible liquid phases. The stratified flow regime in these micro-channels has the inherent advantage that separation at the exit is efficient. In pressure driven flows in microchannels the flow profile is laminar and parabolic. This induces axial dispersion in the system which is known to reduce the efficiency of the process. In micro-channels electro-osmosis has been employed to overcome this drawback, leading to a flow profile that approaches the classical plug flow behaviour.In this work fundamental features of the velocity profiles in stratified flows are analysed. First the flow between two rectangular infinite flat plates is discussed. The influence of physical properties, in particular viscosity of the two liquids, on the velocity profiles is determined symbolically. The flow-profiles are classified in the parameter space of physical properties (viscosity ratio) and operating conditions (flow-rate ratio). The mass transfer in these systems is compared with that found when the two liquids follow an ideal plug flow behaviour. A symbolic solution based on the method of separation of variables is proposed for concentration when the flow profile is a plug flow. It is found that the plug flow profile gives a poorer performance than the laminar profile. This is attributed to the lower velocity prevailing at the interface in the plug flow regime. To understand this more clearly the effect of changing the height of the interface was also analysed and it was found that under some conditions the ideal plug flow can give a better performance than the laminar reactor. The results of this work will aid the experimentalist establish guidelines to determine if introducing electro-osmosis in a Hagen-Poiseuille flow will be beneficial or detrimental in liquid-liquid extraction.

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Microstructured Reactors for Fluid–Fluid Reactions

2014

Microstructured Devices for Chemical Processing

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Liquid–liquid two‐phase mass transfer in the T‐junction microchannels

Cited by 208 publications

References 33 publications

A comparison of efficiency and accuracy of two-electron integrals calculation between two methods in multi-configuration time-dependent hartree fock frame

A comparison of efficiency and accuracy of two-electron integrals calculation between two methods in multi-configuration time-dependent hartree fock frame

Comparison of laminar and plug flow-fields on extraction performance in micro-channels

Microstructured Reactors for Fluid–Fluid Reactions

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