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A kind of preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol

An anion exchange membrane, polyvinyl alcohol technology, applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problem of weak skeleton rigidity, and achieve the effect of excellent attenuation, high stability, and excellent anti-pollution performance.

Active Publication Date: 2022-07-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rigidity of the aliphatic polymer framework is weak, and the mechanical and dimensional stability properties of the preparation need to be improved (Desalination, 2017, 417, 1–8)

Method used

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  • A kind of preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol
  • A kind of preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol
  • A kind of preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Synthesis of 4-bromomethylbenzaldehyde: Weigh 5.00 g (25.5 mmol) of 4-(bromomethyl)benzonitrile (CBB) and fully dissolve it in 100 mL of toluene. In the absence of oxygen, 38.5 mL of a toluene solution of diisobutylaluminum hydride (DIBAL-H) ​​was added dropwise, and the mixture was stirred under an ice bath for 1 hour. Then, the remaining DIBAL-H was quenched with 10 mL of saturated ammonium chloride solution, and the organic phase of the mixed solution obtained after the reaction was extracted with ethyl acetate, and the obtained organic phase was treated with anhydrous MgSO 4 dry. The ethyl acetate was removed by rotary evaporation at 40°C to obtain a pale yellow crude product. Then use a chromatographic column for separation and purification (mobile phase volume ratio: petroleum ether: ethyl acetate = 100: 1) to remove by-products. The petroleum ether and ethyl acetate were removed by rotary evaporation to obtain 4.75 g of white 4-bromomethylbenzaldehyde (BMBD...

Embodiment 2

[0054] (1) Synthesis of 4-bromomethylbenzaldehyde: adopt the same preparation process as Example 1.

[0055] (2) Synthesis of 4-pyridylbenzaldehyde: The same preparation process as in Example 1 was adopted.

[0056] (3) Preparation of crosslinking agent containing bipyridine structure: the same preparation process as in Example 1 was adopted.

[0057] (4) Preparation of cross-linked ion exchange membrane: the same preparation process as in Example 1 was adopted, and the difference was that p-trifluoromethyl benzaldehyde, 4-pyridyl benzaldehyde and the cross-linking agent containing bipyridine structure The molar ratio was 20:10:4, and the masses were 3.7630 g, 2.7814 g, and 2.2171 g, respectively (see Table 1); the thickness of the obtained anion exchange membrane was 119 μm.

[0058] (5) Performance evaluation of cross-linked ion exchange membrane:

[0059] The parameters such as ion exchange capacity, sheet resistance, tensile strength and elongation at break, water absorp...

Embodiment 3

[0061] (1) Synthesis of 4-bromomethylbenzaldehyde: adopt the same preparation process as Example 1.

[0062] (2) Synthesis of 4-pyridylbenzaldehyde: The same preparation process as in Example 1 was adopted.

[0063] (3) Preparation of crosslinking agent containing bipyridine structure: the same preparation process as in Example 1 was adopted.

[0064] (4) Preparation of cross-linked ion exchange membrane: the same preparation process as in Example 1 was adopted, and the difference was that p-trifluoromethyl benzaldehyde, 4-pyridyl benzaldehyde and the cross-linking agent containing bipyridine structure The molar ratio was 25:10:4, and the masses were 4.7038 g, 2.7814 g, and 2.2171 g, respectively (see Table 1); the thickness of the obtained anion exchange membrane was 116 μm.

[0065] (5) Performance evaluation of cross-linked ion exchange membrane:

[0066] The parameters such as ion exchange capacity, sheet resistance, tensile strength and elongation at break, water absorp...

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Abstract

The invention discloses a preparation method of an anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol. Thermally, mechanically and dimensionally stable three-dimensional network structures. The most preferred anion exchange membrane obtained is 3.7Ω·cm 2 , the salt rejection rate reaches 91.3%, which is higher than that of the commercial anion exchange membrane NEOSEPTA AMX, which is 83.5%; the “transition time” of the prepared anion exchange membrane can reach up to 1310 min, which is significantly longer than that of the commercial anion exchange membrane NEOSEPTA AMX. Time" 200 min, indicating superior anti-fouling performance; using the same anion exchange membrane, the attenuation of the "transition time" of the anion exchange membrane prepared after 5 cycles of testing is better than that of the commercial anion exchange membrane NEOSEPTA AMX.

Description

technical field [0001] The invention relates to the field of polymer separation membrane materials, in particular to a preparation method of an anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol, and belongs to the technical field of membranes. Background technique [0002] As an important branch of membrane separation technology, electrodialysis has been widely used in various fields. With the continuous improvement of electrodialysis equipment and processes, the complexity of the water treatment environment has put forward higher requirements for ion exchange membranes. At present, the varieties and performance of ion exchange membranes have gradually improved. The recovery of acids and precious metals has a wide range of applications (Journal of Membrane Science, 2013, 437, 265–275). Commercial anion exchange membranes have been reported to have excellent performance during electrodialysis, but organic pollutants such as proteins, surfactants ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/38B01D61/44B01J41/13
CPCB01D71/38B01D67/0002B01D67/0006B01D69/02B01D61/44B01J41/13B01D2325/42Y02A20/124
Inventor 廖俊斌余璐唐媛媛王彤彤阮慧敏沈江南
Owner ZHEJIANG UNIV OF TECH
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