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Performance of slotted pores in particle manufacture using rotating membrane emulsification

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Particuology 2009年第2期7卷 114-120页

作者： Nita Aryanti Richard A. Williams Institute of Particle Science and Engineering School of ProcessEnvironmental & Materials EngineeringUniversity of LeedsLeeds LS2 9JTUK

This paper addresses the use of different slotted pores in rotating membrane emulsification technology. Pores of square and rectangular shapes were studied to understand the effect of aspect ratio （1-3.5） and their orientation on oil droplet formation. Increasing the membrane rotation speed decreased the droplet size, and the oil droplets produced were more uniform using slotted pores as compared to circular geometry. At a given rotation speed, the droplet size was mainly determined by the pore size and the fluid velocity of oil through the pore （pore fluid velocity）. The ratio of droplet diameter to the equivalent diameter of the slotted pore increased with the pore fluid velocity. At a given pore fluid velocity and rotation speed, pore orientation significantly influences the droplet formation rate： horizontally disposed pores （with their longer side perpendicular to the membrane axis） generate droplets at double the rate of vertically disposed pores. This work indicates practical benefits in the use of slotted membranes over conventional methods.

关键词： membrane emulsification Slotted pore Tubular membrane Rotating emulsification Size control High throughput

Preparation of Monodispersed O/W Emulsion by Ceramic External membrane emulsification System——Preliminary Study on Integrated Ceramic membrane emulsification Reactor

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Chinese Journal of Chemical Engineering 2004年第4期12卷 574-576页

作者：景文珩吴俊邢卫红徐南平 membrane Science & Technology Research Center Key Laboratory of Material-oriented Chemical Engineering of Jiangsu Province Nanjing University of Technology Nanjing 210009 China membrane Science & Technology Research Center Key Laboratory of Material-oriented Chemical Engineering of Jiangsu Province Nanjing University of Technology Nanjing 210009 China new reactor with integrated conventional slurry stirred reactor and ceramic external membrane emul-sification system was introduced in this paper. Toluene and toluene containing surfactant was separately used as dispersed phase for preparation of emulsions. Two kinds of emulsions were prepared and compared. The volume average sizes of prepared emulsions were 3.53 μm and 3.6μm respectively. The results showed that the droplet sizes of two kinds of emulsions were similar but the monodispersed emulsion was only obtained with addition of surfactant into the dispersed phase.

A new reactor with integrated conventional slurry stirred reactor and ceramic external membrane emulsification system, was introduced in this paper. Toluene and toluene containing surfactant was separately used as dispersed phase for preparation of emulsions. Two kinds of emulsions were prepared and compared. The volume average sizes of prepared emulsions were 3.53μm and 3.6μm respectively. The results showed that the droplet sizes of two kinds of emulsions were similar, but the monodispersed emulsion was only obtained with addition of surfactant into the dispersed phase.

关键词： membrane emulsification ceramic membrane emulsion

Fabricating biopolymer-inorganic hybrid microspheres for enzyme immobilization:Connect membrane emulsification with biomimetic mineralization

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Particuology 2022年第5期20卷 171-177页

作者： Jian Li Tiantian Feng Lin Han Min Zhang Tao Jiang College of Chemical Engineering and Materials Science Tianjin University of Science and TechnologyTianjin 300457China

The organic-inorganic hybrid composites displayed great potential for biotechnological and biomedical *** this research,a gelatin/alginate/silica hybrid microsphere was developed by a synergy of membrane emulsification process and biomimetic mineralization *** gelatin was mixed and complexed with alginate solutions(water phase).The water phase was extruded through a Shirasu Porous Glass(SPG)membrane,and then was crosslinked,which formed gelatin/alginate *** biomimetic mineralization was occurred in situ by immersing gelatin/alginate complex in a Na_(2)SiO_(3) solution,while silica was formed around the organic microspheres,resulting in the final gelatin/alginate/silica hybrid *** microspheres were characterized by SEM,TEM,EDS,TGA/DTA,and *** hybrid microcapsules present a more than 40%mass fraction of the inorganic component,and displayed superior swelling resistance to biopolymer complex *** dehydrogenase(GlyDH)was immobilized in the obtained novel gelatin/alginate-silica hybrid microspheres as the model *** to the protective effect of carriers,the pH tolerance stability,storage and recycling stability of the immobilized GlyDH were all improved in comparison with free GlyDH.

关键词： membrane emulsification Immobilized enzyme Biomimetic mineralization Gelatin Alginate Microspheres

Effect of Continuous Phase Viscosity on membrane emulsification

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Chinese Journal of Chemical Engineering 2000年第2期8卷 108-112页

作者：王志王世昌 Volker Schroeder Helmar Schubert Institute of Food Process Engineering Karlsruhe UniversityD-76128 KarlsruheGermany

Oil-in-water(o/w) emulsions were produced with a membrane emulsification system. The effect of the continuous phase viscosity on the emulsification was studied. The theoretical analyses show that the continuous phase viscosity influences not only the flow field of the continuous phase but also the interfacial tension. The droplet size distribution and disperse phase flux for different continuous phase viscosity were investigated experimentally at constant wall shear stress and constant volume flow rate of the continuous phase respectively.

关键词： membrane emulsification viscosity continuous phase

Preparation of Macroporous TiO2 Ceramic Based on membrane Jet-flow emulsification

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Chinese Journal of Chemical Engineering 2007年第4期15卷 616-618页

作者：景文珩吴守红薛业建金万勤邢卫红徐南平 membrane Science ＆ Technology Research Center Key Laboratory of Material-oriented Chemical Engineering ofJiangsu Province ＆MOE Nanjing University of Technology Nanjing 210009 China

A novel method to prepare macroporous TiO2 ceramic, based on membrane emulsification was *** solve the paradox between the instability of nonaqueous emulsion and long emulsification time required by themembrane emulsification, a two-stage ceramic membrane jet-flow emulsification .was. proposed. Discussion wasconducted on the evolution of droplet size with time, which followed the Ostwalcl npemng theory. And a monodispersed nonaqueous emulsion with an average droplet size of 1.6μm could beprepared. Using the emulsion, as atemplate, TiO2 ceramics with an average pore size ot 1.1 μm were obtaineed. Tne material could be prospectivelyused for preparation of catalysts, adsorbents, and membranes.

关键词： nonaqueous emulsion ceramic membrane emulsification jet-flow

Facile one-pot emulsion/sol-gel method for preparing wrinkled silica microspheres

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Particuology 2021年第3期19卷 33-42页

作者： Yuning Hu Dongxia Hao Fangling Gong Yuanyuan Gao Xingran Yan Guanghui Ma State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of ScienceBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

The present manuscript describes a facile and versatile method for preparing uniform wrinkled silica microspheres with diameters of tens of *** method comprises a one-pot emulsion/sol-gel method using silica precursors of organosilane and *** controlling the sol-to-gel transition of the silica precursors,a series of silica microspheres based on uniform emulsion droplets was synthesized by membrane *** silica microspheres had a variety of surface morphologies ranging from smooth,maze-like wrinkles to polygon-like *** was possible to alter the surface morphologies of the microspheres by controlling the amount of organosilane in the dispersed phase and the amount of ammonia catalyst in the continuous phase of the *** grooves on the wrinkled microspheres were able to trap polymer nanoparticles of matching size,thereby demonstrating the potential usefulness of the microspheres in separation science and drug delivery.

关键词： Wrinkled silica microsphere membrane emulsification Emulsion/sol-gel method

Large scale manufacture of magnetic polymer particles using membranes and microfluidic devices

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China Particuology 2007年第1期5卷 26-42页

作者： Richard A. Williams Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Clarendon Road Leeds LS2 9JT United Kingdom

Magnetic polymer particles have found applications in diverse areas such as biomedical treatments, diagnosis and separation technology. These applications require the particles to have controlled sizes and narrow size distributions to gain better control and reproducibility in use. This paper reviews recent developments in the preparation of magnetic polymer particles at nano- and micro-scales by encapsulating magnetic components with dissolved or in situ formed polymers. Particle manufacture using emulsification and embedment methods produces magnetic polymer particles at micro-scale dimensions. However, the production of particles in this range using conventional emulsification methods affords very limited control over particle sizes and polydispersity. We report on alternative routes using membrane and microfluidics emulsification techniques, which have a capability to produce monodisperse emulsions and polymer microspheres （with coefficients of variation of less than 10%） in the range from submicrometer to a few 100 μm. The performance of these manufacturing methods is assessed with a view to future applications.

关键词： Magnetic polymer particles membrane emulsification Microfluidics emulsification Large scale manufacture

Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

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Chinese Journal of Chemical Engineering 2023年第3期55卷 59-62页

作者： Yingxiang Ni Can Yuan Shilong Li Jian Lu Lei Yan Wei Gu Weihong Xing Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

Although hydrophilic membranes are desired for reducing resistance to water permeation, hydrophilic surfaces are not used in the water-in-oil(W/O) membrane emulsification process because water spreads on the hydrophilic surface without forming droplets. Here, we report that a hydrophilic ceramic membrane can form a hydrophobic interface in diesel at a higher temperature;interestingly, the experiments show that the contact angle increases when the temperature rises. The hydrophilic membrane surface evolves into a hydrophobic interface, particularly near the boiling point of water, resulting in a water contact angle of 147.5° ± 1.2°. This work established a method for preparing W/O monodispersed emulsions by direct emulsification of hydrophilic ceramic membranes at a temperature close to the boiling point of ***, it made high flux of membrane emulsification of monodispersed W/O emulsions possible,which satisfied the industrial requirements of fluidized catalytic cracking in the petrochemical industry.

关键词： membrane emulsification Ceramic membrane Hydrophobic interface W/O emulsions

An effective process for the separation of U(Ⅵ),Th(Ⅳ)from rare earth elements by using ionic liquid Cyphos IL 104

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Chinese Chemical Letters 2022年第7期33卷 3422-3428页

作者： Jiawei Lu Kebao He Yi Wang Geng Chen Hanqin Weng Mingzhang Lin School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China

Separation and recovery of U(Ⅵ)and Th(Ⅳ)from rare earth minerals is a very challenging work in rare earth industrial *** the present study,a homemade membrane emulsification circulation(MEC)extractor was used to separate U(Ⅵ)and Th(Ⅳ)from rare earth elements by using Cyphos IL 104 as an *** experiments were carried out using a constant temperature oscillator to investigate the extraction parameters of the single element and the results indicated that Cyphos IL 104could reach the extraction equilibrium within 30 min for all the three elements,i.e.,U(Ⅵ),Th(Ⅳ),and Eu(Ⅲ).Besides,the MEC extractor possessed a strong phase separation *** extraction efficiencies of U(Ⅵ),Th(Ⅳ),La(Ⅲ),Eu(Ⅲ)and Yb(Ⅲ)increased with the increase of ***(Ⅲ),Eu(Ⅲ)and Yb(Ⅲ)were hardly extracted when pH≤1.50,which was beneficial for effectively separating U(Ⅵ)and Th(Ⅳ)from La(Ⅲ),Eu(Ⅲ)and Yb(Ⅲ).In the multi-stages stripping experiments,when the stripping stage number was 3,the effective separation could be achieved by using HCl and H_(2)SO_(4),since the stripping efficiency reached 80.0%and 100.0%for Th(Ⅳ)and U(Ⅵ),*** method and FT-IR spectra showed that Cyphos IL 104 reacted with U(Ⅵ)and Th(Ⅳ)by chelation *** extraction of multi-elements indicated that U(Ⅵ)and Th(Ⅳ)could be well separated from the solution which contains all rare earth elements,and the extraction efficiencies of U(Ⅵ)and Th(Ⅳ)both were close to 100.0%.Based on the above experimental results,a flowchart for efficient separation of U(Ⅵ)and Th(Ⅳ)from rare earth elements was proposed.

关键词： Rare earth elements Actinides Solvent extraction membrane emulsification Ionic liquid