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A kind of modified chitosan/sulfonated polyethersulfone cation exchange membrane and its preparation method

A technology of cation exchange membrane and sulfonated polyethersulfone, which is applied in the field of modified chitosan/sulfonated polyethersulfone cation exchange membrane and its preparation, can solve the problem of high membrane surface resistance and difficult problems of chitosan and polyethersulfone Direct compounding and other issues to achieve the effect of improving porosity, excellent mechanical strength and stability, and delaying the service life of the membrane

Active Publication Date: 2019-06-11
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of modified chitosan / sulfonated polyethersulfone cation exchange membrane and preparation method thereof, by modifying chitosan, solve the problem of chitosan and polyether sulfone The problem that ether sulfone is difficult to be directly compounded; chitosan modified by phthalic anhydride or maleic anhydride is used as a cation exchange membrane additive, which solves the problem that the existing ion exchange membrane restricts ion transmission and the membrane surface resistance is large

Method used

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  • A kind of modified chitosan/sulfonated polyethersulfone cation exchange membrane and its preparation method
  • A kind of modified chitosan/sulfonated polyethersulfone cation exchange membrane and its preparation method
  • A kind of modified chitosan/sulfonated polyethersulfone cation exchange membrane and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] 4g of phthalic anhydride was dissolved in 18g of N,N-dimethylformamide, 1g of chitosan was added, and N 2 Stir and react in the atmosphere, then pour into a large amount of ice water, filter, wash with ethanol, and dry to obtain phthalylated chitosan. 4g polyethersulfone dissolved in 50g methylene chloride, N 2 Under protection, add 8g of chlorosulfonic acid and 2g of concentrated sulfuric acid to react, pour into a large amount of ice water, filter, wash with methanol, and dry to obtain sulfonated polyethersulfone. 0.5g of phthalylated chitosan and 9.5g of sulfonated polyethersulfone were dissolved in 90g of N-methylpyrrolidone, stirred and reacted at 55°C, filtered under reduced pressure, and left to stand for a period of time for defoaming treatment to obtain a casting solution . Pour the casting solution onto a clean glass plate to coat the film, dry it, soak it in deionized water, and remove it. The prepared cation exchange membrane is marked as SPES:NPHCs-1.

...

Embodiment 2

[0023] 3g of phthalic anhydride was dissolved in 19g of N,N-dimethylacetamide, 0.7g of chitosan was added, and N 2 Stir and react in the atmosphere, then pour into a large amount of ice water, filter, wash with ether, and dry to obtain phthalylated chitosan. 3.5g polyethersulfone dissolved in 50g chloroform, N 2 Under protection, 11 g of chlorosulfonic acid was added for reaction, poured into a large amount of ice water, filtered, washed with methanol, and dried to obtain sulfonated polyethersulfone. 0.8g of phthalylated chitosan and 7.2g of sulfonated polyethersulfone were dissolved in 72g of N,N-dimethylformamide, stirred and reacted at 60°C, filtered under reduced pressure, and left to stand for a period of time for defoaming treatment. Obtain casting solution. Pour the casting liquid onto a clean glass plate to coat the film, dry it, soak it in deionized water, and remove it. The prepared cation exchange membrane is marked as SPES:NPHCs-2.

[0024] The contact angle and...

Embodiment 3

[0026] 4g of phthalic anhydride was dissolved in 15g of N,N-dimethylacetamide, 0.9.g of chitosan was added, and at 130°C, N 2 Stir and react in the atmosphere, then pour into a large amount of ice water, filter, wash with ethanol and ether, and dry to obtain phthalylated chitosan. 4g polyethersulfone dissolved in 55g methylene chloride, N 2 Add 12g of oleum to react under protection, pour into a large amount of ice water, filter, wash with ethanol, and dry to obtain sulfonated polyethersulfone. 1g of phthalylated chitosan and 9g of sulfonated polyethersulfone were dissolved in 90g of N-methylpyrrolidone, stirred and reacted at 70°C, filtered under reduced pressure, left to stand for a period of time for defoaming treatment, and a casting solution was obtained. Pour the casting liquid onto a clean glass plate to coat the film, dry it, soak it in deionized water, and remove it. The prepared cation exchange membrane is marked as SPES:NPHCs-3. The contact angle and ion exchange ...

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Abstract

The invention discloses a modified sulfonated polyethersulfone cation exchange membrane and a preparation method thereof. The modified polyethersulfone cation exchange membrane mainly uses sulfonated polyethersulfone as a membrane Chitosan or maleylated chitosan is made as an additive. The beneficial effects of the present invention are as follows: after modification, the porosity of the cation exchange membrane is improved, combined with the sulfonated polyethersulfone membrane matrix to provide mechanical strength, stability and good hydrophilicity, greatly improving the membrane performance, and can be used in electrodialysis ion exchange It has been well applied in the field of membranes.

Description

technical field [0001] The invention discloses a modified chitosan / sulfonated polyethersulfone cation exchange membrane and a preparation method thereof, belonging to the technical field of cation exchange membranes. Background technique [0002] Sulfonated polyethersulfone is a commonly used membrane matrix for preparing cation exchange membranes. It has good film-forming ability, thermodynamic and mechanical properties, and chemical resistance. It is prepared by hydrophilically modifying polyethersulfone with a sulfonating agent. Theoretically speaking, the degree of sulfonation is an important factor affecting the performance of the membrane. The higher the degree of sulfonation, the more exchangeable ions. However, when the degree of sulfonation is high, the membrane material is easy to absorb water and swell, resulting in high permeability and poor mechanical stability. . In addition, most of the existing ion exchange membranes have a relatively dense membrane structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
CPCB01D67/0011B01D69/02B01D71/68B01D2325/24B01D2325/36B01D2325/42B01D2325/48
Inventor 马准李治学徐冬梅高军许玉婷王小濛孙永超王蓉
Owner SHANDONG UNIV OF SCI & TECH
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