Pilot-scale fabrication of nanofiltration membranes and spiral-wound modules

Chen, Bo-Zhi; Ju, Xiaohui; Liu, Ning; Chu, Chang-Hui; Lu, Jin-Peng; Wang, Chen; Sun, Shi‐Peng

doi:10.1016/j.cherd.2020.06.011

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…Chen et al investigated the effects of different fabrication parameters in the course of the production of a home-made PES NF spiral wound module. Their work demonstrated that with increasing PES-substrate thickness the pure water permeability decreases [ 21 ]. An effect through components of the feed solution could be excluded since the results with the other membranes showed that with the investigated lactose concentration no concentration polarization occurred.…”

Section: Resultsmentioning

confidence: 99%

“…The main influencing factors include the membrane properties, the composition of the feed and the operating parameters, which also interact with each other and also may affect significantly the three thermodynamic driving forces: concentration, pressure and voltage differences [ 18 , 19 ]. Nowadays the precise membrane composition is mostly a trade secret, since the membrane manufacturers are very secretive about the exact composition and structure of the membranes [ 20 , 21 ]. This in turn makes predictions even more difficult, especially in the context of interactions between membrane and complex feeds.…”

Section: Introductionmentioning

confidence: 99%

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Screening and Scale-up of Nanofiltration Membranes for Concentration of Lactose and Real Whey Permeate

Hofmann

Hamel

2023

Membranes

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In dairy industry huge quantities of whey accumulate as a by-product. In particular the containing lactose was not produced profitably in the past. Thus, the trend goes towards modification and sustainable use of lactose for which a concentration step is required. Nanofiltration (NF) has shown to be a good choice since partial demineralization can be realized in parallel. Therefore, in this study, 10 commercial polymer NF membranes were studied in detail and systematically for their suitability to concentrate lactose, with the proviso of high flux and high to complete rejection. Preliminary trials were conducted with flat-sheet membranes and a lactose model solution and the influence of transmembrane pressure (TMP), temperature and lactose concentration was studied. Finally, results were evaluated by using spiral wound modules and real industrial whey permeate. The results offered that a membrane screening is essentially since no correlation between molecular weight cut-off (MWCO) and permeate flow could be found. The conclusions found for the lactose model solution were in good agreement with the whey permeate, but as the ions contribute to the osmotic pressure of the feed the deviations increase in the course of concentration since ions are also partly retained.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Screening and Scale-up of Nanofiltration Membranes for Concentration of Lactose and Real Whey Permeate

Hofmann

Hamel

2023

Membranes

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“…12 This uneven distribution of temperature will make different parts of the NF membrane shrink at different rates, which causes defects and nonuniformity of the PA layer. 13 To solve this problem, small molecules such as glycerol are used as pore protectors in industrial production to attenuate the negative effects on the PA layer when drying the NF membrane in a high-temperature oven. 14 But in practice, the additives on the original membrane may detach and contaminate the subsequent treatment or usage, limiting the application of the novel membrane synthesis process, and at higher temperatures, the protective effect of glycerol treatment is not significant.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional heat curing methods use an external heat source to heat the target object through heat conduction and convection, which creates large temperature gradients and results in uneven temperature distribution . This uneven distribution of temperature will make different parts of the NF membrane shrink at different rates, which causes defects and nonuniformity of the PA layer . To solve this problem, small molecules such as glycerol are used as pore protectors in industrial production to attenuate the negative effects on the PA layer when drying the NF membrane in a high-temperature oven .…”

Section: Introductionmentioning

confidence: 99%

Revealing the Effect of Heat Curing on the Uniformity of the Nanofiltration Membrane: Experiment and Simulation Studies

Xiang,

Ping,

et al. 2024

Ind. Eng. Chem. Res.

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Heat curing is an essential step for industrial-scale fabrication of polyamide nanofiltration membranes, which can improve the membrane stability and promote the membrane element encapsulation feasibility, but thermal stresses cannot be avoided during this process. In this study, oven and microwave were used to cure nanofiltration membranes, and the results showed that compared with oven heat curing, the flux dispersion of nanofiltration membranes cured using microwave heat curing was reduced from 0.318 to 0.093, and its Na 2 SO 4 rejection dispersion was reduced from 0.063 to 0.005, providing a tremendous improvement in the uniformity of nanofiltration membranes. The effect of the thermal stress distribution on the uniformity of nanofiltration membranes during heat curing was elucidated by numerical simulations. The fast microwave heating speed and uniform temperature distribution reduced the defects of the PA layer due to uneven thermal stress distribution. In conclusion, this study demonstrated the effect of thermal stress on membrane uniformity in different thermal curing modes, which provides good prospects for the application of microwaves in the field of nanofiltration membranes.

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Introduction

Khulbe

Matsuura

2021

Nanotechnology in Membrane Processes

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Pilot-scale fabrication of nanofiltration membranes and spiral-wound modules

Cited by 8 publications

References 46 publications

Screening and Scale-up of Nanofiltration Membranes for Concentration of Lactose and Real Whey Permeate

Screening and Scale-up of Nanofiltration Membranes for Concentration of Lactose and Real Whey Permeate

Revealing the Effect of Heat Curing on the Uniformity of the Nanofiltration Membrane: Experiment and Simulation Studies

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