Ultrasound-assisted capillary microreactor for aqueous–organic multiphase reactions

Aljbour, Salah; Tagawa, Tetsuya; Yamada, Hiroshi

doi:10.1016/j.jiec.2009.09.008

Cited by 37 publications

(23 citation statements)

References 16 publications

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“…The products prepared by the microreactor with the Caterpillar mixer and the Y-mixer show different features as mentioned above, however, these differences also contain the effect of other factors, such as the flow rate and the residence time. It shows that acoustic disturbing caused by ultrasonic 25,26 promoted the mutual mixing of the reactant streams, strengthened the mass transfer, and produced co-precipitate with more uniform Cu-Zn distribution. Two samples prepared in the Ymixer at ultrasonic and non-ultrasonic condition named after CR-Y1 and CR-Y2 respectively.…”

Section: Effect Of Mixing In Micro-reactorsmentioning

confidence: 99%

“…As can be seen in the figure, the fluctuation of the Cu/Zn ratio of the CR-Y1-precipitate under ultrasonic is smaller than that of CR-Y2-precipitate without ultrasonic. It shows that acoustic disturbing caused by ultrasonic 25,26 promoted the mutual mixing of the reactant streams, strengthened the mass transfer, and produced co-precipitate with more uniform Cu-Zn distribution. For comparison, the data of the Caterpillar mixer are also showed in Figure 7 and its fluctuation is the least.…”

Section: Effect Of Mixing In Micro-reactorsmentioning

confidence: 99%

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The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

et al. 2018

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The influence of feeding point in conventional stirred tank reactor and flow characteristics in micro‐reactor on the microstructure of Cu‐ZnO catalyst was studied. Cu‐Zn distribution in co‐precipitate was characterized by EDS and Zn fraction in zincian malachite was estimated from the 20 true1¯ peak shift in XRD pattern. The theory analysis and experimental results, combining with measurement of segregation index, show that the contact pattern and mixing of reactants in precipitation process determine the uniformity of Cu‐Zn distribution in initial co‐precipitates at the micro‐scale. The uniform Cu‐Zn distribution is favorable for the formation of zincian malachite with higher Zn fraction, whereas the uneven distribution could lead to either zincian malachite with lower Zn fraction or aurichalcite‐like nonmalachite. These differences in the precursor structure act on subsequent calcination and reduction, as well as their products. Along this path, mixing affects the evolution of the catalyst microstructure by means of Cu‐Zn distribution. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2647–2654, 2018

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Section: Effect Of Mixing In Micro-reactorsmentioning

confidence: 99%

Section: Effect Of Mixing In Micro-reactorsmentioning

confidence: 99%

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

et al. 2018

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“…Among the positive methods, ultrasonic mixing technique is considered a non-contact method to create micro and homogeneous structures with very high efficiency [18]. The superior advantages of ultrasonic technology in the blending of multi-phase currents, because the sound stream, local hot spots are created and the formation of the jet is formed at the average compartments of liquid-liquid phase to create cavity-based bubbles [19], [20], resulting in the implosion of the cavitation-based bubbles by shockwaves [21]. Therefore, the two impregnable liquid-liquid phases affected by ultrasound lead to breakage to create an emulsion [22]- [24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis on the Ultrasound-based Mixing Technique Applied to Ultra-low Sulphur Diesel and Bio-oils

Hoang

Tran

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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Pollution in the maritime field is considered as such a serious problem that scientists, policymakers, and managers are always urged with a desire to find solutions and strategies one way or another to minimize its negative impacts on the environment and the life. Among the effective solutions, the use of fuels with limited-sulfur content or bio-based fuels has been paid much attention to due to their advantages in the use of marine diesel engines. In the current study, a type of fossil diesel fuel with ultra-low sulfur content (ULSD) was mixed with coconut oil (CO) through the ultrasonic treatment under the changes in volume fraction of as-used fuels, the correlation on viscosity selected the rate mixing between ULSD and coconut oil. After 12 minutes of ultrasound treatment, the highest stability of the ULSD-CO emulsion was achieved correspondingly to 97.8% for a mixing rate of 76%(ULSD):24%(CO) along with the distance of 85mm from the containing-vessel bottom to the ultrasound horn tip. Moreover, the spray characteristics including penetration length and a cone angle of ULSD, CO, and ULSD-CO emulsion were also examined and compared to diesel fuel. The similarity of spray characteristics to diesel fuel, containing ultra-low sulfur content and oxygen content, renewability are considered as some advantages of ULSD-CO emulsion as used for diesel engines aiming to meet the stricter requirements of IMO regulations about the strategies of environmental protection.

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“…Moreover, a microreactor could operate under continuous flow operation and is easy to scale-up. Microreactor has been applied in many reactions and in both homogeneous [10][11][12][13] and heterogeneous [14][15][16] catalytic systems. Recently, He et al [17] investigated biphasic epoxidation reactions in a microreactor.…”

Section: Introductionmentioning

confidence: 99%

Epoxidation of methyl oleate in a TiO2 coated-wall capillary microreactor

Phimsen

Yamada

Tagawa

et al. 2017

Chemical Engineering Journal

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Ultrasound-assisted capillary microreactor for aqueous–organic multiphase reactions

Cited by 37 publications

References 16 publications

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

The effect of mixing on Co‐precipitation and evolution of microstructure of Cu‐ZnO catalyst

Experimental Analysis on the Ultrasound-based Mixing Technique Applied to Ultra-low Sulphur Diesel and Bio-oils

Epoxidation of methyl oleate in a TiO2 coated-wall capillary microreactor

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