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High-throughput high-retention rate composite nanofiltration membrane preparation method

A technology of composite nanofiltration membrane and rejection rate, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of active layer thickness, small flux, low rejection rate, etc., and achieve easy operation and process Simple and stable effect

Active Publication Date: 2016-06-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PA composite membranes have two main defects: (1) Since the reaction rate of MPDA and TMC is quite fast, the polymer structure formed is mostly a highly cross-linked network, and the active layer obtained is relatively thick, resulting in the affinity of the membrane surface. Insufficient water and low water flux; (2) Due to the negative point load on the surface of the obtained PA membrane, the membrane has a low rejection rate of divalent and high-valent salts
It can be seen that the flux is still very small, and it is limited in practical applications.

Method used

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  • High-throughput high-retention rate composite nanofiltration membrane preparation method

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Embodiment 1

[0039] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:

[0040] (1) Preparation of cross-linked porous support membrane: mix polyetherimide and N-methylpyrrolidone that have been dried at 60°C for 12h in advance so that the mass concentration of polyetherimide is 19%, and stir at 60°C 12h, stand still for 10h to defoam, get the casting solution, pour the casting solution on the polypropylene non-woven fabric, scrape the film, make the thickness of the film 100μm, get a wet film, after 0s volatilization, transfer the wet film to 25℃ Soak in water for 5 minutes, take it out to obtain a base film of polyetherimide support layer, immerse it in an aqueous solution of ethylenediamine with a concentration of 3g / L to carry out cross-linking reaction for 0.5h, take it out and rinse it with deionized water, and blot dry the surface moisture to obtain a cross-linked porous support membrane;

[0041] (2) Pr...

Embodiment 2

[0044] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:

[0045] (1) Preparation of cross-linked porous support membrane: mix polyetherimide and N, N-dimethylformamide which have been dried at 100° C. for 12 h in advance, so that the mass concentration of polyetherimide is 22%, Stir at 90°C for 6 hours, let it stand for 6 hours to defoam, and get the casting solution. Pour the casting solution on the polysulfone non-woven fabric, scrape the film to make the thickness of the film 300 μm, and volatilize for 10 seconds to get a wet film. Transfer to water at 50°C, soak for 120min, take it out to obtain a base film of polyetherimide support layer, immerse in ethylenediamine methanol solution with a concentration of 120g / L for cross-linking reaction for 5h, take it out and rinse it with deionized water, and Blot the moisture on the surface to obtain a cross-linked porous support membrane;

[0046] (2)...

Embodiment 3

[0049] A method for preparing a composite nanofiltration membrane with high throughput and high rejection rate, comprising the steps of:

[0050] (1) Preparation of a cross-linked porous support membrane: mix polyetherimide and N, N-dimethylacetamide which have been dried at 100° C. for 8 hours, so that the mass concentration of polyetherimide is 22%, Stir at 60°C for 6 hours, stand still for 14 hours to defoam, and obtain the casting solution. Pour the casting solution on the polyester non-woven fabric, scrape the film to make the thickness of the film 300 μm, and volatilize for 60 seconds to obtain a wet film. Transfer to 25 ℃ water, soak 60min, take out, obtain polyetherimide supporting layer base film (the surface structure of base film sees figure 1 ), immersed in a concentration of ethylenediamine isopropanol solution of 60g / L to carry out cross-linking reaction 5h, take out and rinse with deionized water, and blot the moisture on the surface to obtain a cross-linked por...

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Abstract

The invention discloses a high-throughput high-retention rate composite nanofiltration membrane preparation method. The preparation method comprises mixing polyetherimide and an organic solvent, carrying out stirring, carrying out standing deaeration to obtain a membrane casting solution, pouring the membrane casting solution on a non-woven fabric, carrying out blade coating and volatilization to obtain a wet membrane, immersing the wet membrane in water, taking out the wet membrane, immersing the wet membrane in an ethene diamine solution for a crosslinking reaction, taking out the membrane, washing the membrane through water, sucking water on the membrane to obtain a crosslinked porous support membrane, fixing the crosslinked porous support membrane between a flat plate and a frame, putting the crosslinked porous support membrane in a constant temperature environment, pouring a water phase aqueous solution into the frame, discharging the solution after the reaction, putting the membrane in a constant temperature environment, removing residual moisture on the membrane surface, pouring a trimesoyl chloride solution into the frame, discharging the solution after a reaction and carrying out drying to obtain the composite nanofiltration membrane. The preparation method has simple processes and can be operated easily. The composite nanofiltration membrane has high throughput, a high retention rate and good membrane stability, can retain micromolecular substances, can be used in a water system and can be used for organic system separation.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane with high flux and high rejection rate. Background technique [0002] The membrane separation process has the advantages of low energy consumption, high single-stage separation efficiency, simple process, and less environmental pollution. It is an important high-tech solution to contemporary energy, resource and environmental problems, and will play a role in the transformation of industrial technology in the 21st century with far-reaching impact. At present, many countries in the world, especially developed countries, have listed membrane separation technology as one of the high-tech priority development, and quickly realized its industrialization. The application results of membrane separation technology have involved the fields of chemical industry, food, medicine, environmental protection and even life science. [0003] Nanofiltration is a new type of membrane se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/12B01D67/00
Inventor 李韡张金利付长欣周阿洋娄利亚
Owner TIANJIN UNIV
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