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Preparation method of homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane

An anion exchange membrane and polyaryl ether sulfone technology, which is applied in the field of preparation of polyaryl ether sulfone anion exchange membranes with homogeneous cross-linked structure alkyl side chains, can solve the problems of increased surface density, increased surface resistance, shortened service life, and low Permeability and other issues to achieve the effect of improving chemical stability

Active Publication Date: 2020-02-07
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem existing in the process of preparing table salt by using ordinary electrodialysis technology to concentrate seawater is: the monovalent anion Cl – (or the monovalent cation Na + ) while migrating to the concentrating compartment, polyvalent anions such as SO 4 2– , CO 3 2– etc. (or polyvalent metal cations such as Ca 2+ , Mg 2+ etc.) also migration to the concentrating compartment
The main problems are: the detachment of the modified layer leads to a shortened service life; the thin modified layer shows lower permeation selectivity; the increase of surface density and the introduction of the opposite charge layer increase the surface resistance of the membrane

Method used

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  • Preparation method of homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane
  • Preparation method of homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane
  • Preparation method of homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Synthesis of amino-containing polyarylethersulfone: 4,4'-difluorodiphenylsulfone (20mmol, 5.0890g), 2,2'-di(4-hydroxyphenyl)hexafluoropropane (15mmol, 2.6898g ) and 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (5mmol, 4.3951g) were added into a 250mL three-necked round bottom flask equipped with a water separator, and NMP (75mL) was used as solvent, while adding 5.5gK 2 CO 3 and 40mL toluene as catalyst and water carrier respectively. in N 2 Under the atmosphere, the reaction was carried out at 155° C. for 4 hours, and further at 165° C. for 3 hours. After the polymer solution dropped to room temperature, it was poured into 300 mL of isopropanol, stirred at high speed, and flocculated to obtain a precipitate. After separation by suction filtration, a brown solid was obtained, which was repeatedly washed with isopropanol and water, and dried under vacuum at 80° C. for 20 hours. 7.3 g of 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane molar fraction of 25...

Embodiment 2

[0055] 1) Synthesis of amino-containing polyarylethersulfone: 4,4'-difluorodiphenylsulfone (20mmol, 5.0890g), 2,2'-di(4-hydroxyphenyl)hexafluoropropane (13mmol, 4.3710g ) and 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (7mmol, 2.9292g) were added into a 250mL three-necked round-bottomed flask equipped with a water separator, and NMP (75mL) was used as solvent, while adding 5.5gK 2 CO 3 and 40mL toluene as catalyst and water carrier respectively. in N 2 Under the atmosphere, the reaction was carried out at 155° C. for 4 hours, and further at 165° C. for 3 hours. After the polymer solution dropped to room temperature, it was poured into 300 mL of isopropanol, stirred at high speed, and flocculated to obtain a precipitate. After separation by suction filtration, a brown solid was obtained, which was repeatedly washed with isopropanol and water, and dried under vacuum at 80° C. for 20 hours. The amino group-containing polyaryl ether sulfone with a molar ratio of 35% of...

Embodiment 3

[0060] 1) Synthesis of amino-containing polyarylethersulfone: 4,4'-difluorodiphenylsulfone (20mmol, 5.0890g), 2,2'-bis(4-hydroxyphenyl)hexafluoropropane (11mmol, 3.6985g ) and 2,2'-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (9mmol, 3.7661g) were added into a 250mL three-necked round-bottomed flask equipped with a water separator, and NMP (75mL) was used as solvent, while adding 5.5gK 2 CO 3 and 40mL toluene as catalyst and water carrier respectively. in N 2 Under the atmosphere, the reaction was carried out at 155° C. for 4 hours, and further at 165° C. for 3 hours. After the polymer solution dropped to room temperature, it was poured into 300 mL of isopropanol, stirred at high speed, and flocculated to obtain a precipitate. After separation by suction filtration, a brown solid was obtained, which was repeatedly washed with isopropanol and water, and dried under vacuum at 80° C. for 20 hours. The amino group-containing polyaryl ether sulfone with a molar ratio of 45% o...

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Abstract

The invention relates to a preparation method of a homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane. The preparation method comprises the following steps: step 1, performing a reaction on 3-bromopropylamine-methylimidazole bromate (I) and x-chloro-1-alkanol (II) so as to generate an x-dihydroxy-alkyl-chain side-chain imidazolium salt (III); step 2, performing a reaction on the compound (III) so as to prepare an x-dichloro-alkyl-chain side-chain imidazolium salt (IV); step 3, dissolving amino-containing polyether sulphone (V), the x-dichloro-alkyl-chain side-chain imidazolium salt (IV) and 1-bromo-3-methylimidazolium salt-alkyl chain (VI) in an organic solvent, and carrying out still standing for defoaming so as to obtain a membrane castingsolution; and step 4, coating a clean glass plate with the membrane casting solution obtained in the step 3, carrying out an in-situ reaction, and performing vacuum drying so as to obtain the homogeneous cross-linked-structure alkyl side chain-type polyether sulphone anion exchange membrane. The prepared anion exchange membrane has the characteristics of a low swelling rate, good structural stability and high monovalent-multivalent permeation selectivity.

Description

[0001] (1) Technical field [0002] The invention relates to the field of polymer materials, in particular to a preparation method of an alkyl side chain type polyaryl ether sulfone anion exchange membrane with a homogeneous crosslinked structure. [0003] (2) Background technology [0004] The problem existing in the process of preparing table salt by using ordinary electrodialysis technology to concentrate seawater is: the monovalent anion Cl – (or the monovalent cation Na + ) while migrating to the concentrating compartment, polyvalent anions such as SO 4 2– , CO 3 2– etc. (or polyvalent metal cations such as Ca 2+ , Mg 2+ etc.) also migrate to the concentrating compartment. When the CaSO in the concentration chamber 4 , CaCO 3 When the concentration is higher than the solubility product of its salt, a precipitate is formed and deposited on the surface of the membrane, which increases the membrane surface resistance, etc., resulting in a decrease in the current effi...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/24C08L81/06C08K5/3445B01D67/00B01D69/02B01D71/68
CPCC08J5/18C08J3/24B01D71/68B01D67/0002B01D69/02C08J2381/06C08K5/3445B01D2325/42
Inventor 沈江南廖俊斌俞欣妍陈权高兴王利祥
Owner ZHEJIANG UNIV OF TECH
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