Preparation and Application of an Anion Exchange Membrane Using BMP for Internal Crosslinking

An anion exchange membrane and electrodialysis technology, which is applied in the field of preparation and application of anion exchange membranes using BMP for internal cross-linking, can solve the problems of poor mechanical properties and dimensional stability, poor performance, complicated processes, etc. The effect of alkali resistance and swelling resistance, high current efficiency, high salt rejection rate

Active Publication Date: 2021-12-21
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0003] The traditional method of preparing anion-exchange membranes uses trimethylamine as a quaternizing agent, but the prepared membranes have disadvantages such as unstable performance, loose structure, and rough membrane surface due to corrosion by trimethylamine.
In order to enhance the ion transport capacity of the ion exchange membrane, the ion exchange membrane usually needs to have a higher IEC, which often leads to poor mechanical properties and dimensional stability of the membrane. Therefore, without reducing the IEC, the membrane can be simultaneously Having high mechanical strength and dimensional stability is also a problem that needs to be solved at present
Cross-linking is an effective method to reduce the swelling degree and water absorption rate of anion exchange membranes, but the current cross-linking method still has the following problems: 1. The film-forming reaction process requires at least two steps, and the process is complicated
2. The crosslinking agent is incompatible with the polymer backbone, resulting in poor performance of the membrane

Method used

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  • Preparation and Application of an Anion Exchange Membrane Using BMP for Internal Crosslinking
  • Preparation and Application of an Anion Exchange Membrane Using BMP for Internal Crosslinking
  • Preparation and Application of an Anion Exchange Membrane Using BMP for Internal Crosslinking

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preparation example Construction

[0029] Preparation of chloromethylated polysulfone (CMPSF):

[0030] Pour 10g of polysulfone (PSF) into a three-necked flask, then add 500mL of chloroform, stir for 12h to dissolve completely, then add 13.56g of paraformaldehyde, 57.36mL of trimethylchlorosilane and 0.53mL of tetra Add tin chloride to the above solution in turn, heat and stir for 60h, and set the temperature to 50 o c. Finally, the solution was precipitated in ethanol solution to precipitate the product, and then the product was suction-filtered and dried to obtain chloromethylated polysulfone (CMPSF).

Embodiment 1

[0032] Accurately weighed 0.5 g of chloromethylated polysulfone into 7 mL of 1-methyl-2-pyrrolidone (NMP), stirred and dissolved at room temperature for 5 h, and dissolved it completely to obtain a colorless transparent solution. Add 0.052 g of 4,4'-trimethylenebis(1-methylpiperidine) (BMP) to the resulting solution, and then stir the reaction at room temperature for 1 h to allow cross-linking and quaternization reactions to occur, and then The casting solution was degassed in a vacuum oven. Finally, pour the casting solution on a clean glass plate and scrape the film with a scraper, and dry it in vacuum at 80°C for 24 h. Take out the dried membrane, soak it in deionized water, let it fall off freely, and use it for future use (recorded as CAPSF-40 membrane).

Embodiment 2

[0034] Accurately weighed 0.5 g of chloromethylated polysulfone into 7 mL of 1-methyl-2-pyrrolidone (NMP), stirred and dissolved at room temperature for 5 h, and dissolved it completely to obtain a colorless transparent solution. Add 0.078 g of 4,4'-trimethylenebis(1-methylpiperidine) (BMP) to the resulting solution, and then stir the reaction at room temperature for 50 min to allow cross-linking and quaternization reactions to occur, and then The casting solution was degassed in a vacuum oven. Finally, pour the casting solution on a clean glass plate and scrape the film with a scraper, and dry it in vacuum at 80 °C for 24 h. Take out the dried membrane, soak it in deionized water, let it fall off freely, and use it for future use (denoted as CAPSF-60 membrane).

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Abstract

The invention discloses the preparation and application of an anion exchange membrane using BMP for internal cross-linking. The preparation method is as follows: (1) Dissolving chloromethylated polysulfone in NMP at room temperature, fully stirring to completely dissolve the chloromethylated polysulfone, and obtaining a colorless and transparent chloromethylated polysulfone solution; ( 2) At room temperature, add a certain amount of 4,4'-trimethylenebis(1-methylpiperidine) to the chloromethylated polysulfone solution and stir for 20-60min to make it react with chloromethylated polysulfone Cross-linking and quaternization reactions to obtain the casting solution; (3) Degas the casting solution completely, then pour it on a clean glass plate and scrape the film with a scraper, dry it in vacuum, and then fully soak it in deionized water to make the film Naturally fall off from the glass plate to obtain anion exchange membrane. The anion exchange membrane prepared by the present invention has good swelling resistance and alkali resistance, and the present invention provides the application of the anion exchange membrane in electrodialysis desalination, which has the advantages of high desalination rate, high current efficiency and low energy consumption advantage.

Description

technical field [0001] The invention relates to a preparation method of an anion exchange membrane cross-linked by using BMP and its application in electrodialysis desalination. Background technique [0002] Electrodialysis technology is based on the selective migration of ions under the action of an electric field to purify and separate substances. Electrodialysis technology can not only be used to produce safe drinking water and separate harmful chemicals from water, but also plays a prominent role in food, chemical and pharmaceutical industries. The advantages of electrodialysis technology compared with other separation technologies are mainly reflected in In terms of low energy costs, lower pretreatment requirements, easier operation, lower maintenance costs and longer membrane life. [0003] The traditional method of preparing anion-exchange membranes uses trimethylamine as a quaternizing agent, but the prepared membranes have disadvantages such as unstable performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/44
CPCB01D61/44B01D67/0016B01D69/02B01D71/68B01D2325/42Y02A20/124
Inventor 沈江南姜玉良阮慧敏潘杰锋
Owner ZHEJIANG UNIV OF TECH
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