Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution

An ultrafiltration membrane, high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy pollution, fast decay, low PES ultrafiltration membrane flux, etc. The effect of strong performance, low cost and easy industrial production

Active Publication Date: 2015-04-08
JIANGSU KAIMI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problems of low flux, fast attenuation and easy pollution of PES ultrafiltration membrane in the prior art, and is to provide a high flux and stable Anti-fouling, high-throughput ultrafiltration membrane with high flux recovery rate after backwashing, preparation method thereof and casting solution used

Method used

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  • Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution
  • Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution
  • Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution

Examples

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Effect test

Embodiment 1

[0044] Put 80 parts of N-methylpyrrolidone, 1 part of intercompatibility porogen (the mass ratio of polyvinylpyrrolidone to ethylene glycol is 3:1), and 3 parts of citric acid in a three-necked bottle and ultrasonically treat it at 30°C for 40 minutes ; to obtain a solution. Add 16 parts of polyethersulfone into the solution, stir at 70°C for 8 hours at a stirring speed of 200-400r / min, then raise the temperature to 85°C and stir for 2 hours, then lower the temperature to 70°C and stir for 6 hours to obtain a casting solution. Vacuum defoaming of the casting liquid for 35 minutes under a vacuum condition of 0.1 MPa, and then let it stand for 24 hours after defoaming, and then put it on an integrated tubular film coating machine together with the non-woven fabric, and roll the non-woven fabric into The tubular film is coated on the inner surface at the same time, and the overlapping joints of the non-woven fabric are ultrasonically welded to obtain a tubular film; then the tub...

Embodiment 2

[0047] Put 70 parts of N-methylpyrrolidone, 6 parts of intercompatibility porogen (the mass ratio of polyvinylpyrrolidone to ethylene glycol is 5:1), and 5 parts of citric acid in a three-necked bottle and ultrasonically treat it at 30°C for 40 minutes ; to obtain a solution. Add 19 parts of polyethersulfone into the solution, stir at 70°C for 8h at a stirring speed of 200-400r / min, then raise the temperature to 85°C and stir for 2h, then lower the temperature to 70°C and stir for 6 hours to obtain a casting solution. Vacuum defoaming of the casting solution for 60 minutes under a vacuum condition of 0.1 MPa, and then let it stand for 24 hours after defoaming, and then place it on an integrated tubular film coating machine together with the non-woven fabric, and roll the non-woven fabric into The tubular film is coated on the inner surface at the same time, and the overlapping joints of the non-woven fabric are ultrasonically welded to obtain a tubular film; then the tubular ...

Embodiment 3

[0050] Put 75 parts of N,N-dimethylacetamide, 4 parts of intercompatibility porogen (mass ratio of polyvinylpyrrolidone to glycerin: 3;1), 5 parts of citric acid in a three-necked bottle and ultrasonically treat at 30°C 40 minutes; a solution was obtained. Add 16 parts of polyethersulfone into the solution, stir at 70°C for 8 hours at a stirring speed of 200-400r / min, then raise the temperature to 85°C and stir for 2 hours, then lower the temperature to 70°C and stir for 6 hours to obtain a casting solution. Vacuum defoaming of the casting solution for 60 minutes under a vacuum condition of 0.1 MPa, and then let it stand for 24 hours after defoaming, and then place it on an integrated tubular film coating machine together with the non-woven fabric, and roll the non-woven fabric into The tubular film is coated on the inner surface at the same time, and the overlapping joints of the non-woven fabric are ultrasonically welded to obtain a tubular film; then the tubular film is st...

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Abstract

The invention relates to a membrane casting solution for preparing an anti-pollution and high-flux ultrafiltration membrane. The membrane casting solution is prepared from the following components by weight: 16-30% of polyether sulfone, 1-6% of a mutual matching pore forming agent, 0.5-5% of an organic acid additive and 60-80% of a solvent. The invention also relates to the anti-pollution and high-flux ultrafiltration membrane and a preparation method thereof. The tubular or flat ultrafiltration membrane prepared from the membrane casting solution has the characteristics of uniform pore size distribution, high membrane flux, good stability, strong pollution resistance, high flux recovery rate after backwashing, wide range of application, good mechanical strength and chemical resistance, and is applicable to high viscosity and high solid content system. Compared with other preparation method, the preparation method has the characteristics of simple process, controllable membrane pore size, low cost and convenience for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of polymer separation membranes, and in particular relates to an anti-pollution, high-throughput ultrafiltration membrane, a preparation method thereof, and a membrane casting solution used. Background technique [0002] Ultra / microfiltration technology is one of the pressure-driven membrane separation technologies, that is, under a certain pressure, small molecular solutes and solvents can pass through a special membrane with a certain pore size, while macromolecular solutes cannot pass through. , staying on one side of the membrane, so that the macromolecular substances are partially purified, and has the advantages of normal temperature operation, no phase change in the process, low energy consumption, and high separation efficiency. It is currently used in drinking water purification, petrochemicals, biomedicine, food, Metallurgy and other industries have been widely used. [0003] Polyethersulfone is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 曹敏云金明杨志亚张羽
Owner JIANGSU KAIMI MEMBRANE TECH
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