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Reinforced hollow fiber membrane, preparation method and applications thereof

An enhanced fiber membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor binding force, unsatisfactory binding strength, complicated preparation process, etc., and achieve strong binding ability, high water Effect of flux, high breaking strength

Active Publication Date: 2018-07-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is only applicable to the surface of glass fiber, and the transition layer will form a smooth interface after cross-linking, and the bonding strength between the separation layer and the transition layer is still not satisfactory
[0007] Existing preparation methods of reinforced hollow fiber membranes all focus on the method of forming hollow fiber membranes by combining the braided hollow fiber braided tube with the upper composite layer. On the one hand, the preparation process is complicated; The degree of coating with the separation layer is low and the bonding force is poor, which cannot well meet the needs of the existing industrial MBR process

Method used

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  • Reinforced hollow fiber membrane, preparation method and applications thereof
  • Reinforced hollow fiber membrane, preparation method and applications thereof
  • Reinforced hollow fiber membrane, preparation method and applications thereof

Examples

Experimental program
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preparation example Construction

[0058] One aspect of the present invention provides a method for preparing a reinforced hollow fiber membrane, the method comprising:

[0059] (1) In an alkaline solution, the fiber filaments are activated to obtain activated fiber filaments;

[0060] (2) In the modification solution, the activated fiber filaments are impregnated with a modification composition to obtain modified fiber filaments;

[0061] (3) in the metal salt solution, contacting the modified fiber filament with the metal salt to obtain a fiber filament with nanoparticles on the surface;

[0062] (4) mixing the fiber filaments with nanoparticles on the surface with the membrane-making solution, and braiding the resulting mixture to obtain a hollow fiber braided tube;

[0063] (5) forming the hollow fiber braided tube into a reinforced hollow fiber membrane;

[0064] Wherein, the modified composition contains a first polyphenolic compound and crosslinking molecules; the film-forming solution contains a film-...

Embodiment approach

[0180] According to a preferred embodiment of the present invention, the weaving is: the silver-containing fiber bundle and the polymer fiber bundle are cross-braided in a "herringbone" shape along the core liquid tube.

[0181] Preferably, the polymer fiber bundle is composed of 100-1000 fiber filaments. Preferably, the silver-containing fiber bundle is composed of 1-10 silver-containing fiber filaments.

[0182] According to the present invention, the silver-containing fiber bundles can be obtained commercially or by self-made.

[0183] According to a preferred embodiment of the present invention, the fiber filaments are selected from at least one of polyester fibers, polyamide fibers, polyolefin fibers, polyamide fibers, polyurethane fibers, polysulfone fibers or glass fibers, preferably polyester fibers and / or or polyamide fibers.

[0184] According to a preferred embodiment of the present invention, the casting solution used in step 2) includes polyvinylidene fluoride, ...

preparation example 1-6

[0207] According to the composition in Table 1 (the kind of each compound and the concentration in modified solution are as listed, wherein, concentration refers to the net mass of each compound accounts for the percentage of modified solution gross weight), the reagent under each modified solution Mix to obtain corresponding modified solutions respectively, in Table 1:

[0208] Polyethyleneimine is purchased from aldrich company, and its number average molecular weight is 3000;

[0209] Tannic acid was purchased from Aladdin Reagent Company;

[0210] Polyethylene glycol was purchased from Sinopharm Chemical Reagent Co., Ltd., and its number average molecular weight was 1000.

[0211] Modified solution preparation comparative example 1

[0212] According to the preparation of modified solution 1, the difference is that no polyethyleneimine is added and an equal amount of dopamine is used instead of polyethyleneimine, thereby obtaining modified solution DA1.

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Abstract

The invention relates to the field of preparation of hollow fiber membranes, particularly to a reinforced hollow fiber membrane, a preparation method and applications thereof. The method comprises: activating fibers in an alkaline solution to obtain activated fibers; impregnating a modification composition in a modification solution by using the activated fibers to obtain modified fibers, carryingout a contact reaction on the modified fibers and a metal salt in a metal salt solution to obtain fibers with nanparticles on the surface, mixing the fibers with nanparticles on the surface and a membrane forming liquid, braiding the obtained mixture to obtain a hollow braided pipe, and molding the hollow braided pipe to obtain the reinforced hollow fiber membrane. According to the present invention, the reinforced hollow fiber membrane prepared through the method has high backwash membrane breaking pressure, can integrate high water flux and high fracture strength, and is suitable for membrane bioreactors.

Description

technical field [0001] The invention relates to the field of preparation of hollow fiber membranes, in particular to a reinforced hollow fiber membrane and its preparation method and application. Background technique [0002] With economic development and population increase, the problem of water scarcity is becoming more and more prominent, so the demand for wastewater reuse is getting higher and higher. Membrane separation technology has been rising since the 1960s. Because of its advantages such as high separation degree, high efficiency and energy saving, environmental protection and safety, and integration, it has quickly become the most widely used new generation separation technology. It is used in food, medicine, biology, Environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics and bionics have all achieved huge economic and social benefits. [0003] Among them, the membrane bioreactor (MBR) has the characteristics of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/44B01D69/08B01D67/00
CPCB01D67/0093B01D69/08C02F3/1268B01D67/0095B01D2325/24B01D2325/48B01D69/10B01D69/105B01D61/00C02F3/2853B01D2323/12B01D2323/50
Inventor 吴长江杨永强任鹏飞奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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