Method for preparing homogeneous-phase anion exchange film

An anion-exchange membrane and membrane-forming technology, applied in the field of preparing homogeneous anion-exchange membranes, can solve the problems of low exchange capacity, limited scope of application, affecting applications, etc., and achieve high ion-exchange capacity, strong anti-pollution, homogeneous phase Stable performance

Inactive Publication Date: 2007-06-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the raw material used in the above method is also polystyrene particles, and the bromoacetylated product after bromination is easily hydrolyzed, so that the exchange capacity after amination is not high, which affects its application; similarly, active ions will be continuously exchanged during use. Lost and inactivated, requiring frequent regeneration; and the product is an ion exchange resin rather than a membrane, which cannot be applied in the fields of electrodialysis, diaphragm electrolysis or fuel cell diaphragm, so the scope of application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Using chloroform as a solvent, the reactant molar ratio is poly(2,6-dimethyl 1,4 phenylene oxide) (PPO): anhydrous aluminum trichloride (AlCl 3 ): chloroacetyl chloride (CAC) = 1: 1.25: 1.25, react at 40 ° C, and use trimethylamine solution as an amination reagent to prepare a homogeneous quaternary ammonium anion exchange membrane

[0024] (1) Preparation of film casting solution: 1molppo and 1.25mol anhydrous aluminum trichloride are dissolved successively in a 250ml three-neck flask equipped with an electric stirrer and 100ml chloroform, and after being fully dissolved under stirring, use constant Slowly add 20ml of chloroacetyl chloride dropwise into the funnel; after reacting at 40°C for four hours, first dissolve the reaction product with ethanol and then use ethanol to precipitate the product chloroacetylated ppo. Dry under vacuum at 60°C.

[0025] The product after drying is carried out infrared spectroscopic analysis, at 1700cm -1 A strong acyl ...

Embodiment 2

[0031] Embodiment 2: With chloroform as solvent, reactant molar ratio is PPO: AlCl 3 : CAC = 1: 1.25: 1.25, react at 40°C, use diethylamine solution as amination reagent to prepare homogeneous tertiary amine anion exchange membrane

[0032] (1) Preparation of film casting solution: Dissolve 1mol PPO and 1.25mol anhydrous aluminum trichloride in turn in a 250ml three-neck flask filled with 100ml chloroform, and after it is fully dissolved under stirring, slowly add 20ml dropwise with a constant pressure funnel Chloroacetyl chloride. After reacting at 40° C. for four hours, the reaction product was first dissolved with ethanol and then the product chloroacetylated PPO was precipitated with ethanol. Dry under vacuum at 60°C.

[0033] The product after drying is carried out infrared spectroscopic analysis, at 1700cm -1 A strong acyl peak appears at the place, indicating that the chloroacetyl group has been attached to the PPO benzene ring.

[0034] Dissolve 10 g of chloroacety...

Embodiment 3

[0039] Embodiment 3: Using chloroform as a solvent, the reactant molar ratio is poly(2,6-dimethyl 1,4 phenylene oxide) (PPO):AlCl 3 : CAC=1: 1.25: 1.25, react at different temperatures, use trimethylamine solution as amination reagent to prepare homogeneous quaternary ammonium anion exchange membrane

[0040] (1) Preparation of casting solution: sequentially dissolve 1mol PPO and 1.25mol anhydrous aluminum trichloride in a 250ml three-necked flask filled with 100ml chloroform, and slowly add it dropwise with constant pressure funnel after it is fully dissolved under stirring 20ml of chloroacetyl chloride were reacted at a reaction temperature of 20°C, 30°C, 40°C, 50°C, and 60°C. After the reaction was complete, the reaction product was first dissolved with ethanol, and then the product chloroacetylated PPO was precipitated with ethanol. Dry under vacuum at 60°C.

[0041] The product after drying is carried out infrared spectroscopic analysis, at 1700cm -1 A strong acyl peak ...

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PUM

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Abstract

The present invention relates to a preparation method of homogeneous anion-exchange membrane. Said method includes three processes of membrane-casting liquor preparation, membrane-forming and amination. Said invention also provides the concrete steps of above-mentioned every process. Said homogeneous anion-exchange membrane has extensive application field, it can be used for making concentration or desalination of dilute brine solution in electrodialysis method, can be used as electrolytic diaphragm in metallurgical industry, can be used as diffusive dialysis membrane for recovering acid and can be used as anionic selective electrode, etc.

Description

Technical field: [0001] The invention belongs to the field of membrane technology, and particularly relates to a method for preparing a high polymer with easily aminated halogenated acyl groups by Friedel-Crafts reaction, and using the high polymer as a matrix to prepare a homogeneous anion exchange membrane. Background technique: [0002] At present, anion exchange membranes have been widely used in various industrial fields, such as: electrodialysis to concentrate or desalt dilute salt solution, as electrolytic diaphragm in hydrometallurgical industry, acid recovery from waste acid, as anion selective electrode, as Alkaline fuel cell membrane, etc. However, it is difficult to prepare anion-exchange membranes in the prior art. The main reason is that the traditional preparation method needs to adopt the chloromethylation step, which will use the carcinogen chloromethyl ether, so people have been looking for an anion without using chloromethyl ether. method of exchanging me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/82B01D69/06C08J5/22B01J41/12B01J41/13
Inventor 徐铜文吴亮
Owner UNIV OF SCI & TECH OF CHINA
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