Monovalent selective cation exchange membrane as well as preparation method and application thereof

A cation exchange membrane, selective technology, applied in cation exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of difficult large-scale industrialization, poor long-term stability, high membrane resistance, and achieve the effect of resource extraction and utilization

Pending Publication Date: 2022-07-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The target pollutants are combined with the main structure of the ion exchange membrane through chemical bonds, which effectively reduces the surface resistance, improves the limiting current density under the operating conditions of electrodialysis, and avoids the stripping of the modified compound and the membrane matrix during long-term operation; but there are also The defects of low selectivity coefficient, high membrane resistance, easy peeling of the surface skin, poor long-term stability and difficulty in large-scale industrialization

Method used

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  • Monovalent selective cation exchange membrane as well as preparation method and application thereof
  • Monovalent selective cation exchange membrane as well as preparation method and application thereof
  • Monovalent selective cation exchange membrane as well as preparation method and application thereof

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preparation example Construction

[0059] The preparation method of the sulfonated polymer material used in the following examples and comparative examples comprises the following steps:

[0060] 30g of polymer material and 80g of concentrated sulfuric acid were mechanically stirred in a constant temperature water bath at 80°C for 24h, the resulting mixed solution was added dropwise to ice water, then washed with deionized water until neutral, and vacuum-dried at 60°C to constant weight to obtain the degree of sulfonation It is 14% of sulfonated polymer material; the above description of the sulfonation method of polymer material is to more completely describe the technical solution of the present invention, and should not be regarded as a specific limitation of the present invention.

Embodiment 1

[0062] This embodiment provides a method for preparing a monovalent selective cation exchange membrane, and the preparation method includes the following steps:

[0063] (1) The sulfonated polyethersulfone and polyethersulfone with a mass ratio of 1:1 are mixed in nitrogen methyl pyrrolidone at a speed of 150 rpm and agitated at a temperature of 70 ° C until a transparent and uniform casting solution is formed, and then allowed to stand. After defoaming for 8 hours, the defoamed casting liquid was cast on a glass plate, scraped with a scraper with a thickness of 200 μm to form a film, volatilized for 5 s and then immersed in a water bath at 25 ° C. After the film fell off, the negatively charged base was obtained. membrane;

[0064] The sulfonation degree of the sulfonated polyethersulfone is 14%, and the nitrogen methylpyrrolidone accounts for 75wt% of the total mass of the casting liquid;

[0065] (2) Fix the negatively charged base film of step (1) in the PTFE frame, pour ...

Embodiment 2

[0072] This embodiment provides a method for preparing a monovalent selective cation exchange membrane, and the preparation method includes the following steps:

[0073] (1) The sulfonated polyethersulfone and polyethersulfone with a mass ratio of 0.3:1 are mixed in nitrogen methyl pyrrolidone at a speed of 150 rpm and agitated at a temperature of 70 ° C until a transparent and uniform casting solution is formed, and then allowed to stand. After defoaming for 7 hours, the defoamed casting liquid was cast on a glass plate, scraped with a scraper with a thickness of 200 μm to form a film, and immersed in a water bath at 25 °C after volatilization for 5 s. After the film fell off, the negatively charged base was obtained. membrane;

[0074] The sulfonation degree of the sulfonated polyethersulfone is 14%, and the nitrogen methylpyrrolidone accounts for 72wt% of the total mass of the casting solution;

[0075] (2) Fix the negatively charged base film described in step (1) on the ...

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Abstract

The invention provides a monovalent selective cation exchange membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: defoaming a membrane casting solution of a blended polymer material, and scraping to obtain a membrane to obtain a negatively charged base membrane; the blended polymer material comprises a functionalized polymer material and a corresponding non-functionalized polymer material; sequentially contacting the surface of the negatively charged base membrane with a water phase solution and an oil phase solution for primary interfacial polymerization, and then contacting with the water phase solution for secondary interfacial polymerization to obtain the monovalent selective cation exchange membrane. The simple and mild preparation method is adopted, through two interfacial polymerization reactions, a compact anti-charge skin layer is constructed on the surface of the negative charge base membrane, and efficient separation of monovalent and multivalent cations by the monovalent selective cation exchange membrane is achieved.

Description

technical field [0001] The invention belongs to the technical field of electrically driven membrane separation, and relates to a cation exchange membrane, in particular to a monovalent selective cation exchange membrane and a preparation method and application thereof. Background technique [0002] Electrodialysis technology has been widely used in chemical, food and pharmaceutical fields, but it is difficult to achieve the separation of single and multivalent ions in conventional electrodialysis process. With the needs of industrial development, selective electrodialysis technology is receiving extensive attention in recent years. [0003] The sieving mechanism of monovalent selective ion exchange membrane is mainly based on pore size sieving, electrostatic repulsion and hydration energy difference; currently common preparation methods of monovalent selective ion exchange membrane include blending, covalent crosslinking, surface modification and composite method . Among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/18C08G69/00
CPCB01J39/18C08G69/00Y02A20/131
Inventor 纪志永陈加帅汪婧郭志远刘杰赵颖颖郭小甫李非王士钊黄志辉
Owner HEBEI UNIV OF TECH
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