Cross-flow and dead-end microfiltration of oily-water emulsion. Part I: Experimental study and analysis of flux decline

Koltuniewicz, Andrzej Benedykt; Field, Robert W.; Arnot, Tom

doi:10.1016/0376-7388(94)00320-x

Cited by 182 publications

(64 citation statements)

References 5 publications

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“…These values are comparable to those reported in previous work on membrane separation under externally applied pressures 3,4,6,7,39,40 . Furthermore, in intermittent stop-and-go operation, the fluxes did not decrease over a period of 100 h (Fig.…”

Section: Continuous Separation Of Oil-water Emulsionssupporting

confidence: 90%

Hygro-responsive membranes for effective oil–water separation

et al. 2012

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There is a critical need for new energy-efficient solutions to separate oil-water mixtures, especially those stabilized by surfactants. Traditional membrane-based separation technologies are energy-intensive and limited, either by fouling or by the inability of a single membrane to separate all types of oil-water mixtures. Here we report membranes with hygro-responsive surfaces, which are both superhydrophilic and superoleophobic, in air and under water. our membranes can separate, for the first time, a range of different oil-water mixtures in a singleunit operation, with >99.9% separation efficiency, by using the difference in capillary forces acting on the two phases. our separation methodology is solely gravity-driven and consequently is expected to be highly energy-efficient. We anticipate that our separation methodology will have numerous applications, including the clean-up of oil spills, wastewater treatment, fuel purification and the separation of commercially relevant emulsions.

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Section: Continuous Separation Of Oil-water Emulsionssupporting

confidence: 90%

Hygro-responsive membranes for effective oil–water separation

et al. 2012

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“…This model effectively describes distinct fouling mechanisms in a definite period of filtration [22][23][24][25]. However, Iritani et al [26] reported that these individual models were unable to fit their experimental observations and indicated that a combination of effects would probably lead to better results.…”

Section: Introductionmentioning

confidence: 99%

A combined network model for membrane fouling

Griffiths¹,

Kumar

Stewart

2014

Journal of Colloid and Interface Science

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Section: Membrane Emulsificationmentioning

confidence: 99%

“…In premix membrane emulsification (PME) (Figure 1b), a pre-emulsion is pressed through the membrane (Suzuki et al, 1996) or a packed bed of uniform particles (van der Zwan et al, 2008;Yasuda et al, 2010;Laouini et al, 2014), which leads to homogenisation of existing coarse droplets. If the transmembrane pressure is lower than the capillary pressure, the pressure force acting on a droplet will not be able to squeeze the droplet through a pore, which will lead to the separation of the pre-emulsion into a dropletfree continuous phase and concentrated emulsion (Koltuniewicz et al, 1995; Park et al, 1998).Hydrophobic membranes are needed to produce water-in-oil (W/O) (Cheng et al, 2008;Jing et al, 2006) and oil-in-water-in-oil (O/W/O) (Wei et al, 2013) emulsions and hydrophilic membranes are required to prepare oil-in-water (O/W) and water-in-oil-in-water (W/O/W) (Vladisavljević et al, 2014) emulsions. The advantages of PME over DME are in smaller droplet sizes and higher transmembrane fluxes that can be achieved for any given pore size and higher dispersed phase content that can be obtained (up to 60 vol% in simple PME and up to 90 vol% in PME with phase inversion (Suzuki et al, 1999)).…”

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confidence: 99%

Structured microparticles with tailored properties produced by membrane emulsification

Vladisavljević

2015

Advances in Colloid and Interface Science

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This paper provides an overview of membrane emulsification routes for fabrication of structured microparticles with tailored properties for specific applications. Direct (bottom-up) and premix (top-down) membrane emulsification processes are discussed including operational, formulation and membrane factors that control the droplet size and droplet generation regimes. A special emphasis was put on different methods of controlled shear generation on membrane surface, such as cross flow on the membrane surface, swirl flow, forward and backward flow pulsations in the continuous phase and membrane oscillations and rotations. Droplets produced by membrane emulsification can be used for synthesis of particles with versatile morphology (solid and hollow, matrix and core/shell, spherical and non-spherical, porous and coherent, composite and homogeneous), which can be surface functionalised and coated or loaded with macromolecules, nanoparticles, quantum dots, drugs, phase change materials and high molecular weight gases to achieve controlled/targeted drug release and impart special optical, chemical, electrical, acoustic, thermal and magnetic properties. The template emulsions including metal-in-oil, solid-in-oil-in-water, oil-in-oil, multilayer, and Pickering emulsions can be produced with high encapsulation efficiency of encapsulated materials and narrow size distribution and transformed into structured particles using a variety of different processes, such as polymerisation (suspension, mini-emulsion, interfacial and in-situ), ionic gelation, chemical crosslinking, melt solidification, internal phase separation, layer-by-layer electrostatic deposition, particle self-assembly, complex coacervation, spray drying, sol-gel processing, and molecular imprinting. Particles fabricated from droplets produced by membrane emulsification include nanoclusters, colloidosomes, carbon aerogel particles, nanoshells, polymeric (molecularly imprinted, hypercrosslinked, Janus and core/shell) particles, solder metal powders and inorganic particles. Membrane 2 emulsification devices operate under constant temperature due to low shear rates on the membrane surface, which range from (1−10) × 10 3 s −1 in a direct process to (1−10) × 10 4 s −1 in a premix process.Keywords: Membrane Emulsification; Polymeric microsphere; Microgel; Janus Particle; Core/Shell Particle, Colloidosome. Membrane emulsificationMembrane emulsification (ME) involves preparation of emulsions by pressing a pure dispersed phase or pre-emulsified mixture of the dispersed and continuous phase through a microporous membrane under controlled injection rate and shear conditions. In direct membrane emulsification (DME), one liquid (a dispersed phase) is injected through a microporous membrane into another immiscible liquid (the continuous phase) (Nakashima et al., 1991;, which leads to the formation of droplets at the membrane/continuous phase interface ( Figure 1a). In premix membrane emulsification (PME) (Figure 1b), a pre-emulsion is pressed through the membrane (...

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Cross-flow and dead-end microfiltration of oily-water emulsion. Part I: Experimental study and analysis of flux decline

Cited by 182 publications

References 5 publications

Hygro-responsive membranes for effective oil–water separation

Hygro-responsive membranes for effective oil–water separation

A combined network model for membrane fouling

Structured microparticles with tailored properties produced by membrane emulsification

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