Surfactant‐free microdispersion process of gas in organic solvents in microfluidic devices

Tan, Jing; Du, Le; Xu, Jianhong; Wang, K.; Luo, Guangsheng

doi:10.1002/aic.12487

Cited by 26 publications

(15 citation statements)

References 46 publications

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“…Continuous gas phase flows downstream the main channel. The designations of squeezing, dripping, and laminar flows derive from previous gas-liquid two-phase microflow studies [31][32][33]. To show the similarity of two-phase microflow and three-phase microflow, a control group experiment without water feeding was also performed in the same microchannel device.…”

Section: Gas-phase Flow Behaviors At the Cross Junctionmentioning

confidence: 99%

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Generating Gas‐Liquid‐Liquid Three‐Phase Microflows in a Cross‐Junction Microchannel Device

Wang

Kang

et al. 2013

Chem Eng & Technol

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The generation of gas‐liquid‐liquid three‐phase microflows in a cross‐junction microchannel device is experimentally analyzed. Three gas‐phase and eight water‐phase flow manners at the cross junction are described with oil phase as continuous phase. Comparing with the gas‐liquid and liquid‐liquid two‐phase microflows, similar flow behaviors of dispersed phases exist in the three‐phase processes but new capillary numbers as well as the phase ratio of dispersed phases need to be introduced in the flow maps to distinguish the complicated three‐phase flow modes. Although the three‐phase flows are mercurial at the channel junction, only six flow patterns are observed in the downstream microchannel. According to the experimental results, the effects of bubble/droplet generation manners on their size distributions are indicated. The generation mechanisms of bubbles and droplets are analyzed and correlated equations are established for their average volumes.

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Section: Gas-phase Flow Behaviors At the Cross Junctionmentioning

confidence: 99%

“…For the dripping-ruptured bubbles, previous results indicated that the average bubble diameter is a function of channel size, phase ratio of gas phase to liquid phase, and capillary number of the continuous phase [31]. Eq.…”

Section: Size Laws Of Generated Bubbles and Dropletsmentioning

confidence: 99%

Generating Gas‐Liquid‐Liquid Three‐Phase Microflows in a Cross‐Junction Microchannel Device

Wang

Kang

et al. 2013

Chem Eng & Technol

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“…The dimensionless average bubble diameter has a linear relation with ð Q d Qc Þ 0:33 , which is close to the conclusion of previous work. 21 Using the model, we could calculate the bubble diameter in different conditions, the calculated data fit the experimental data well, as shown in Fig…”

Section: Bubble Generation In Single-pore Microdevicesmentioning

confidence: 82%

Bubble generation rules in microfluidic devices with microsieve array as dispersion medium

et al. 2015

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in Wiley Online Library (wileyonlinelibrary.com)Microfluidic devices with microsieve array as the dispersion medium have been well recognized. However, few studies have been made on gas-liquid two-phase flow in microsieve dispersion devices. The bubble generation rules with singlepore, radial-array pores, axial-array pores, and square-array pores were systematically investigated. The rules of pore activation have been suggested by considering the capillary force, flow resistances of both dispersed phase and continuous phase. An empirical equation and a theoretical equation to predict the activation of pores in microfluidic devices were developed. An equation to correlate the average bubble diameter with parameter of channel structure, phase ratio, and Ca number of continuous phase was also developed. The strategy of design and scaling up for microsieve devices is proposed. Meanwhile, a device with dual-size pores according to the rules derived is designed. This device achieved much better dispersion performance. Experimental MaterialsWe used 1 wt % sodium dodecyl sulfate (SDS) and 5 wt % polyethylene glycol (PEG) aqueous solution as the continuous phase. SDS was used as surfactant. We measured the Figure 15. Design schematic of microsieve dispersion device.

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“…The micromixer is made of PEEK (polyether ether ketone) material with an inner diameter of 0.25 mm. The Y-shaped micromixer has been applied for the gas/liquid and liquid/liquid dispersion in previous literature. − Water and Cl 2 gas flowed through the pipes immersed in Water Bath 1 to control the feeding temperature. A delay loop (polytetrafluoroethylene, PTFE) immersed in Water Bath 2 with an inner diameter of 1 mm and an external diameter of 1.6 mm was connected directly downstream to the second micromixer to control the reaction time.…”

Section: Methodsmentioning

confidence: 99%

Chlorohydrination of Allyl Chloride to Dichloropropanol in a Microchemical System

Zhang

Tan

Wang

et al. 2012

Ind. Eng. Chem. Res.

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A microchemical system, including two micromixers and a delay loop, is specially designed to carry out the chlorohydrination of allyl chloride with chlorine in water. Chlorine is dissolved in water in the first micromixer and then reacts with allyl chloride to produce dichloropropanol in the second micromixer. The reaction can be accomplished in the delay loop with a residence time less than 10 s and the selectivity higher than 98%. A multistage strategy which connects several microchemical units in series has been developed and demonstrated. The dichloropropanol concentration higher than 6 wt % with the selectivity higher than 96% can be successfully reached using this strategy. The results show that low temperature and high pressure could greatly improve the microreaction performance. In contrast to the conventional reaction process, the microreaction process has the advantages for higher yield, higher dichloropropanol concentration, less water waste, and lower energy consumption. Moreover, the new process could make the reaction process employing chlorine more controllable and safe.

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Surfactant‐free microdispersion process of gas in organic solvents in microfluidic devices

Cited by 26 publications

References 46 publications

Generating Gas‐Liquid‐Liquid Three‐Phase Microflows in a Cross‐Junction Microchannel Device

Generating Gas‐Liquid‐Liquid Three‐Phase Microflows in a Cross‐Junction Microchannel Device

Bubble generation rules in microfluidic devices with microsieve array as dispersion medium

Chlorohydrination of Allyl Chloride to Dichloropropanol in a Microchemical System

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