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Anion exchange membrane and preparation method thereof

An anion exchange membrane and film coating technology, applied in the field of anion exchange membrane and its preparation, can solve the problems of economic consumption, environmental pollution, high production cost, cost increase, etc., achieve outstanding economic and environmental benefits, and simple membrane production process. Effect

Active Publication Date: 2021-07-02
福建省漳州福化水务发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, methods (1) and (2) need to use a large amount of organic solvents in the process of film formation, which will cause serious economic consumption and environmental pollution, while method (3) must use high-energy rays to bombard the base film to form active sites. Subsequent modification can only be carried out, but the strong carcinogenicity of high-energy rays and high production costs limit the large-scale application of the prepared membrane, and this method also requires the use of organic solvents as the irradiated base membrane for subsequent modification reactions media, they also face a series of problems caused by the use of solvents
[0004] In summary, the traditional anion-exchange membrane preparation method faces the problems of increased cost and environmental pollution caused by the use of organic solvents. Therefore, it is very important to develop a green preparation method for anion-exchange membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 1g of chloromethylated polyethersulfone in a mixed solution of 3g of chloromethylstyrene and 0.3g of divinylbenzene, then add 0.3g of azobisethylbutyronitrile and 1.2g of imidazole and stir evenly, and cast the obtained The membrane solution was scraped on the glass fiber cloth, and then heated and polymerized at 60° C. for 48 hours to obtain an anion exchange membrane. The anion exchange capacity of the membrane was measured to be 2.05 mmol / g.

[0025] The diffusion dialysis performance of the membrane was tested by the method of Comparative Example 1. The results showed that at 25° C., the acid dialysis coefficient of the anion exchange membrane prepared in this example was 0.035 m / h, and the acid / salt separation factor was 60.9. Compared with the anion exchange membrane prepared in Comparative Example 1, the anion exchange membrane prepared in this example has a similar ion exchange capacity, that is, the number of ion exchange sites of the two is similar, bu...

Embodiment 2

[0028] Dissolve 1g of chloromethylated polyethersulfone in a mixed solution of 1g of chloromethylstyrene and 0.02g of divinylbenzene, then add 0.02g of azobisethylbutyronitrile and 0.4g of imidazole and stir evenly, and cast the obtained The membrane solution was sprayed on the nylon cloth, and then heated and polymerized at 90° C. for 6 hours to obtain an anion exchange membrane. The anion exchange capacity of the membrane was measured to be 1.84 mmol / g.

[0029] The diffusion dialysis performance of the membrane was tested by the method of Example 1. The results showed that at 25° C., the acid dialysis coefficient of the membrane prepared in this example was 0.014 m / h, and the acid / salt separation factor was 82.5. It can be seen that the anion exchange membrane prepared by the present invention has excellent diffusion dialysis performance and can be used in the field of waste acid recovery.

Embodiment 3

[0031] This example adopts the same operation process as Example 1, the only difference is that the casting liquid is dipped into the coating film on the polyester cloth to obtain an anion exchange membrane with similar structure and performance, which can be used in the field of waste acid recovery.

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PUM

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Abstract

The invention discloses an anion exchange membrane and a preparation method thereof, and belongs to the technical field of membranes, and the anion exchange membrane is prepared by the following steps: naturally dissolving a polymer reinforcing agent chloromethylated polyethersulfone, an initiator azodiethylbutyronitrile and a functional agent imidazole in a mixed solution containing two monomers of chloromethyl styrene and divinyl benzene; and coating a reinforced fabric with a formed uniform membrane casting solution, and carrying out heating polymerization to obtain the anion exchange membrane. According to the invention, a classical polymerization system of vinylbenzyl chloride and divinyl benzene is improved, a green preparation route of the anion exchange membrane without using an organic solvent is developed, and the prepared anion exchange membrane shows excellent performance when being applied to diffusion dialysis acid recovery; the requirements of industrial waste acid recovery and application are completely met.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to an anion exchange membrane and a preparation method thereof. Background technique [0002] Anion exchange membranes are widely used in seawater desalination, food industry, waste acid recovery and other fields. In recent decades, research on ion exchange membranes has attracted increasing attention from researchers. At present, the three most common anion exchange membrane preparation methods are as follows: (1) polymerizing monomers in organic solvents to form membranes, as reported in the Dutch Journal of Power Sources (Journal of PowerSources, 255 , 2014 , 325-334) A kind of preparation method of anion exchange membrane, it is that polyvinyl chloride is dissolved in cyclohexanone, then add 4-vinylpyridine as polymerization monomer, 1,4-dibromobutane as functional agent, diphenyl peroxide Acyl is used as an initiator, and after stirring evenly, the polymerization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L25/18C08L81/06B01J39/20
CPCC08J5/2243B01J39/20C08J2325/18C08J2481/06Y02E60/50
Inventor 林小城戴广恺刘旭辉
Owner 福建省漳州福化水务发展有限责任公司
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