Preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol

A technology of anion exchange membrane and polyvinyl alcohol, which is applied in the direction of anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of weak skeleton rigidity, and achieve the effects of excellent attenuation, superior anti-pollution performance, and high stability

Active Publication Date: 2021-11-05
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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  • Preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol
  • Preparation method of anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol
  • 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 grams (25.5mmol) of 4-(bromomethyl)benzonitrile (CBB) and fully dissolve it in 100mL of toluene. Under anaerobic conditions, 38.5 mL of a toluene solution of diisobutylaluminum hydride (DIBAL-H) ​​was added dropwise, and stirred for 1 hour under an ice bath. Then, the remaining DIBAL-H was quenched with 10 mL of saturated ammonium chloride solution, and the organic phase of the resulting mixture was extracted with ethyl acetate, and the resulting organic phase was washed with anhydrous MgSO 4 dry. Ethyl acetate was removed by rotary evaporation at 40°C to obtain a pale yellow crude product. Then use chromatographic column separation and purification (mobile phase volume ratio: petroleum ether: ethyl acetate = 100:1) to remove by-products. Petroleum ether and ethyl acetate were removed by rotary evaporation to obtain 4.75 g of white 4-bromomethylbenzaldehyde (BMBD).

[0048] (2) Synthesis of 4-pyridylbenzaldehyde:...

Embodiment 2

[0054] (1) Synthesis of 4-bromomethylbenzaldehyde: adopt the same preparation process as in 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: adopt the same preparation process as in Example 1, the difference is that p-trifluoromethyl benzaldehyde, 4-pyridyl benzaldehyde and containing bipyridine structure cross-linking agent The molar ratio was 20:10:4, and the masses were 3.7630 grams, 2.7814 grams and 2.2171 grams 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] Parameters such as ion exchange capacity, surface resistance, tensile strength and elongation at break, water absorption...

Embodiment 3

[0061] (1) Synthesis of 4-bromomethylbenzaldehyde: adopt the same preparation process as in 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: adopt the same preparation process as in Example 1, the difference is that p-trifluoromethyl benzaldehyde, 4-pyridyl benzaldehyde and containing bipyridine structure cross-linking agent The molar ratio was 25:10:4, and the masses were 4.7038 grams, 2.7814 grams and 2.2171 grams 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] Parameters such as ion exchange capacity, surface resistance, tensile strength and elongation at break, water absorption...

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Abstract

The invention discloses a preparation method of an anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol, which comprises the following steps: selecting polyvinyl alcohol as a polymer main chain, and then performing hydrophobicity and ion exchange group modification on the polymer main chain by using functional small molecules to form a three-dimensional network structure with stable heat, mechanical and size. The optimal anion exchange membrane is 3.7 omega.cm < 2 >, and the desalination rate reaches 91.3%, which is higher than the desalination rate of a commercial anion exchange membrane NEOSEPTA AMX by 83.5%; the maximum'transformation time 'of the prepared anion exchange membrane can reach 1310 minutes, which is obviously longer than the'transformation time' 200 minutes of a commercial anion exchange membrane NEOSEPTA AMX, which shows excellent anti-pollution performance; and by adopting the same anion exchange membrane, the attenuation condition of'transformation time 'of the prepared anion exchange membrane is superior to that of a commercial anion exchange membrane NEOSEPTA AMX after five times of cycle tests.

Description

technical field [0001] The invention relates to the field of polymer separation membrane materials, in particular to a preparation method for an anti-pollution cross-linked anion exchange membrane based on polyvinyl alcohol, and belongs to the membrane technology field. 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 technology, the complexity of the water treatment environment puts forward higher requirements for ion exchange membranes. At present, the types and performance of ion exchange membranes are gradually improving, and they have been used in brine desalination, industrial wastewater desalination, and chemical waste. 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 exce...

Claims

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Application Information

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Patent Type & Authority Applications(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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