Modeling of the variations of permeate flux, concentration polarization, and solute rejection in nanofiltration system

Zhang, Yaqin; Zhang, Lin; Hou, Li’an; Kuang, Shibo; Yu, Aibing

doi:10.1002/aic.16475

Cited by 17 publications

(11 citation statements)

References 47 publications

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“…However, after cleaning the membrane surface with n‐hexane for 30 min, the membrane surface almost returned to the state before the test (Figure S6(b) and S6(c)), and the n‐hexane permeance also returned to the initial 96%. Therefore, the gradually decreased permeance was attributed to concentration polarization rather than fouling 53,54 . These results demonstrate that the dual‐layer membrane with hierarchical hydrophobicity and transport channels can be used for the lecithin concentrating and the n‐hexane recovery in industrial applications, saving energy costs compared to conventional evaporation processes.…”

Section: Resultsmentioning

confidence: 74%

“…Therefore, the gradually decreased permeance was attributed to concentration polarization rather than fouling. 53,54 These results demonstrate that the dual-layer membrane with hierarchical hydrophobicity and transport channels can be used for the lecithin concentrating and the n-hexane recovery in industrial applications, saving energy costs compared to conventional evaporation processes. Table 1 compares the separation performance between this work and other work for small molecules separation in the n-hexane system.…”

Section: Regulating Sio 2 and Htfda Concentrations For Optimized Lementioning

confidence: 80%

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Dual‐layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration

Wang

Liu

et al. 2021

AIChE Journal

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Nonpolar solvent separation is widely used in petroleum, chemical, food industries, but traditional separation methods consume intensive energy. State-of-art organic solvent nanofiltration membranes require complex modifications for nonpolar solvent transport. For the first time, we propose the concurrent modification of the surface, interface and support layer of dual-layer membranes with three additives (perfluorodecylamine, fluoro substituted aromatic amine, silica nanoparticles) in a onestep cocasting process. A delamination-free dual-layer membrane was obtained with a hierarchical hydrophobicity and transport channels. The novel designed structure elevated the pure n-hexane permeance (28.75 L m −2 hr −1 bar −1) by 3 orders of magnitude with a high lecithin rejection (98.7%). This method of synergistically controlling the hierarchical structures and properties of dual-layer membranes can significantly shorten the preparation process of high-performance nonpolar solvent nanofiltration membranes.

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Section: Resultsmentioning

confidence: 74%

Section: Regulating Sio 2 and Htfda Concentrations For Optimized Lementioning

confidence: 80%

Dual‐layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration

Wang

Liu

et al. 2021

AIChE Journal

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“…At the end of the process, when the saturation was 1.28, the flux was 0.38 kg•m −2 •h −1 . The membrane flux drop was probably caused by the combined action of solution vapor pressure drop, concentration polarization, temperature polarization, and membrane fouling [31][32][33]. During the whole MD process, the conductivity of permeate remained below 10 μs•cm −1 .…”

Section: Preferential Crystallization Of Zinc Sulfate By MD Integratementioning

confidence: 99%

Separation and Recycling of Concentrated Heavy Metal Wastewater by Tube Membrane Distillation Integrated with Crystallization

Lou

Bai

et al. 2020

Membranes

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Tube membrane distillation (MD) integrated with a crystallization method is used in this study for the concurrent productions of pure water and salt crystals from concentrated single and mixed system solutions. The effects of concentrated Zn2+ and Ni2+ on performance in terms of membrane flux, permeate conductivity, crystal recovery rates, and crystal grades are investigated. Preferred crystallization and co-crystallization determinations were performed for mixed solutions. The results revealed that membrane fluxes remained at 2.61 kg·m−2·h−1 and showed a sharp decline until the saturation increased to 1.38. Water yield conductivity was below 10 μs·cm−1. High concentrated zinc and nickel did not have a particular effect on the rejection of the membrane process. For the mixed solutions, membrane flux showed a sharp decrease due to the high saturation, while the conductivity of permeate remained below 10 μs·cm−1 during the whole process. Co-crystallization has been proven to be a better method due to the existence of the SO42− common-ion effect. Membrane fouling studies have suggested that the membrane has excellent resistance to fouling from highly concentrated solutions. The MD integrated with crystallization proves to be a promising technology for treating highly concentrated heavy metal solutions.

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“…In previous studies, the extent of concentration polarization has usually been evaluated by the wall concentration defined at the wall node on the membrane wall boundary . From the viewpoint of the numerical calculation, however, the accuracy of the wall concentration is tremendously influenced by the size and quality of the mesh near the wall.…”

Section: Problem Statementmentioning

confidence: 99%

Fouling mitigation in crossflow filtration using chaotic advection: A numerical study

Jung

Kang

et al. 2019

AIChE Journal

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Fouling mitigation in a crossflow filtration system using chaotic advection is numerically studied. A barrier-embedded partitioned pipe mixer (BPPM) is selected as a static mixer, creating chaotic advection in a laminar flow regime. Mixing characteristics are controlled via two design parameters, the mixing protocol and the dimensionless barrier height (β). The average dimensionless concentration boundary layer thickness (δ B =R) and the surface-averaged dimensionless wall concentration (c w) dramatically decrease with the introduction of the BPPM, incorporating a chaotic flow system. δ B =R and c w decrease as β increases, and the largest reduction of c w is observed in the counter-rotational protocol. A semi-ring configuration is revealed to be the most appropriate configuration to characterize mixing near the membrane surface. It is found that a filtration system with a globally chaotic flow shows the best mixing performance and the largest reduction of fouling.

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Modeling of the variations of permeate flux, concentration polarization, and solute rejection in nanofiltration system

Cited by 17 publications

References 47 publications

Dual‐layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration

Dual‐layer membrane with hierarchical hydrophobicity and transport channels for nonpolar organic solvent nanofiltration

Separation and Recycling of Concentrated Heavy Metal Wastewater by Tube Membrane Distillation Integrated with Crystallization

Fouling mitigation in crossflow filtration using chaotic advection: A numerical study

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