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Anion exchange membrane with high anion permeability and high ion selectivity, preparation method and application thereof

An anion-exchange membrane and ion-selective technology, which is applied in the field of electrodialysis process, can solve the problems of pouring film formation and anion-exchange membrane difficulty, and achieve high anion permeability, good mechanical properties and performance stability, and good performance stability Effect

Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problem that comb-like PPO anion exchange membranes are difficult to pour into membranes at a higher IEC by introducing hydrophobic alkyl-modified series dication side chains on the PPO skeleton

Method used

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  • Anion exchange membrane with high anion permeability and high ion selectivity, preparation method and application thereof
  • Anion exchange membrane with high anion permeability and high ion selectivity, preparation method and application thereof
  • Anion exchange membrane with high anion permeability and high ion selectivity, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of BPPO with DBM of 0.1

[0035] Dissolve PPO (12.00g, methyl mole number 200mmol) in 100ml of chlorobenzene, add N-bromosuccinimide NBS (3.56g, 20mmol) and azoisobutyronitrile AIBN (0.22g, 1.33mmol) , react at 135°C for 2.5h, use 500 ml of methanol as the reaction solution to obtain a light yellow solid, filter and wash three times with methanol, dry in the air at 60°C and vacuum-dry to obtain brominated poly-2,6-dimethylphenyl ether with a DBM of 0.1 ( BPPO).

[0036] (2) single ion quaternization reagent a) preparation

[0037]Dissolve 1-bromohexane (10mmol, 1.65g) in 30mL ethyl acetate, add N,N,N',N'-tetramethylethylenediamine (11mmol, 1.28g), and stir the reaction at 30°C for 48h After filtration, a light yellow solid was obtained, and the light yellow solid was washed with 50 mL of ethyl acetate and then dried to obtain quaternization reagent a): N-(2-(dimethylaminoethyl)-N,N-dimethylhexyl- 1-ammonium bromide, the structural formula is as follow...

Embodiment 2

[0044] (1) Preparation of BPPO with DBM of 0.15

[0045] Dissolve PPO (12.00g, methyl mole number 200mmol) in 100ml of chlorobenzene, add N-bromosuccinimide NBS (5.34g, 30mmol) and azoisobutyronitrile AIBN (0.32g, 2.00mmol) , react at 135°C for 2.5h, use 500 ml of methanol as the reaction solution to obtain a light yellow solid, filter and wash three times with methanol, dry in the air at 60°C and vacuum-dry to obtain brominated poly-2,6-dimethylphenyl ether with a DBM of 0.15 ( BPPO).

[0046] (2) single ion quaternization reagent) a preparation

[0047] Single ion quaternization reagent a) is prepared with the same example 1 (2).

[0048] (3) Preparation of tandem dication side chain type polyphenylene ether anion exchange membrane QPTa-2 linked by hydrophobic alkyl groups:

[0049] Dissolve the quaternization reagent a) (1.5mmol, 0.42g) in (23mL) N-methylpyrrolidone, add BPPO (1.32g, bromomethyl mole number 1.5mmol) with a DBM of 0.15, and then stir the reaction at 30°C ...

Embodiment 3

[0053] (1) Preparation of BPPO with DBM of 0.2

[0054] Dissolve PPO (12.00g, methyl mole number 200mmol) in 100ml of chlorobenzene, add N-bromosuccinimide NBS (7.12g, 40mmol) and azoisobutyronitrile AIBN (0.434g, 2.67mmol) , react at 130°C for 3h, use 500ml of methanol for the reaction solution to obtain a light yellow solid, filter and wash three times with methanol, dry in the air at 60°C and vacuum-dry to obtain brominated poly-2,6-dimethylphenylene ether (BPPO) with a DBM of 0.2 ).

[0055] (2) single ion quaternization reagent a) preparation

[0056] Single ion quaternization reagent a) is prepared with the same example 1 (2).

[0057] (3) Preparation of tandem dication side chain type polyphenylene ether anion exchange membrane QPTa-3 linked by hydrophobic alkyl groups:

[0058] Dissolve the quaternization reagent a) (2.0mmol, 0.56g) in (25mL) N-methylpyrrolidone, add BPPO (1.36g, bromomethyl mole number 2.0mmol) with a DBM of 0.2, and then stir the reaction at 40°C ...

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Abstract

The invention discloses an anion exchange membrane with high anion permeability and high ion selectivity, a preparation method and application thereof. The material of the ion exchange membrane is a free dication chain structure polyphenylene ether ionomer with a hydrophobic alkyl modification of 1-6 carbons. When the IEC is 1.30-2.59meq / g, the ion selective permeability is 90%- 96%, the surface resistance is 1.60‑5.57Ω / cm 2 . The present invention effectively improves the charge density of the obtained membrane by introducing a 1-6-carbon hydrophobic alkyl-modified serial cation on the poly-2,6-dimethylphenylene ether skeleton, and solves the problem of commercial monoquaternary ammonium ion PPO. The anion exchange membrane has a problem of low anion and cation selectivity when it has a high IEC, while improving the anion and cation selective permeability of the membrane, it also enhances the ion conductivity of the membrane, and has good mechanical properties, which can meet the requirements of the electrodialysis process for anion. The comprehensive performance requirements of the exchange membrane.

Description

technical field [0001] The invention relates to a preparation method of a serial double cation anion exchange membrane connected by a hydrophobic alkyl side chain, and the anion exchange membrane is suitable for an electrodialysis process. Background technique [0002] Electrodialysis technology is an emerging membrane separation technology, which has the characteristics of simple equipment, convenient operation, high efficiency and no pollution. In recent years, electrodialysis technology with ion exchange membrane as the core has been widely used to control environmental pollution, solve problems such as water shortage and energy shortage, and has shown great application prospects. [0003] Anion exchange membrane is the core component of electrodialysis technology. As two important performance parameters of membranes, ionic conductivity and ion selective permeability always show a negative correlation. Generally, anion exchange membranes can only have efficient ion condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J41/13B01J47/12C02F1/469
CPCB01J47/12B01J41/13C02F1/4693
Inventor 李秀华魏标文余以刚潘健聪
Owner SOUTH CHINA UNIV OF TECH
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