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Method for preparing organic-solvent-resistant ultrafiltration membrane, prepared ultrafiltration membrane and application of ultrafiltration membrane

An organic solvent-resistant, ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of limited application scope and easy swelling, and achieve the effects of shortening membrane preparation time, improving mass transfer speed, and enhancing solvent resistance.

Active Publication Date: 2016-06-29
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the ultrafiltration membrane preparation method in the prior art is mature, convenient and low in cost, there are certain defects in the application of the ultrafiltration membrane prepared by it.
The ultrafiltration membrane in the prior art faces the aqueous solution system, and has excellent stability and separation performance in aqueous solution, but it is easy to swell in many organic solvents, and the application range is limited

Method used

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  • Method for preparing organic-solvent-resistant ultrafiltration membrane, prepared ultrafiltration membrane and application of ultrafiltration membrane
  • Method for preparing organic-solvent-resistant ultrafiltration membrane, prepared ultrafiltration membrane and application of ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] After uniformly mixing 2.5g of polyimide and 10g of N,N-dimethylformamide, mechanically stir at 55°C for 5h to fully dissolve, and then use a high-speed centrifuge at room temperature at 1500r / min High-speed centrifugal defoaming for 15 minutes to obtain casting solution;

[0041] Use a flat-plate scraping machine to evenly scrape the defoamed casting solution on the polyester non-woven fabric, control the height of the scraper, scrape it into a film at room temperature, and form a coating with a thickness of 150um; The coating was left to evaporate in the air at room temperature for 20 seconds, and then immersed in deionized water at 30°C for 10 minutes. At this time, the high molecular polymer in the casting solution undergoes a gel phase transition and precipitates on the surface of the non-woven fabric to form a film;

[0042] Then take out the membrane, wash the residual solution on the surface of the membrane with deionized water, then filter and wash with pure is...

Embodiment 2

[0052] Mix 2.5g of polyimide, 0.14g of polyethylene glycol 400 and 11.25g of N,N-dimethylformamide evenly, stir mechanically at 55°C for 5h to fully dissolve, and then use high-speed centrifugation Centrifuge and defoam at a high speed at 1500r / min for 15min at room temperature to obtain the casting solution;

[0053] Use a flat-plate scraping machine to evenly scrape the defoamed casting solution on the polyester non-woven fabric, control the height of the scraper to scrape it into a film at room temperature, and form a coating with a thickness of 150um; The layer was left to evaporate in the air at room temperature for 5 seconds, and then immersed in deionized water at 30°C for 10 minutes. At this time, the high molecular polymer in the casting solution undergoes gel phase transformation and precipitates on the surface of the non-woven fabric to form a film;

[0054] Then take out the membrane, rinse the residual solution on the surface of the membrane with deionized water, ...

Embodiment 3

[0059] After uniformly mixing 4.5g of polyimide and 16g of N,N-dimethylformamide, mechanically stir at 55°C for 6h to fully dissolve, and then use a high-speed centrifuge at room temperature at 1500r / min High-speed centrifugal defoaming for 30min;

[0060] Utilize a flat-plate scraping machine to evenly scrape the prepared casting solution on the polyester non-woven fabric, control the height of the scraper to scrape it into a film at room temperature, and form a coating with a thickness of 120um; Leave to evaporate in air at room temperature for 20 seconds, and then immerse in deionized water at 30°C for 30 minutes. At this time, the high molecular polymer in the casting solution undergoes gel phase transformation and precipitates on the surface of the non-woven fabric to form a film;

[0061] Then take out the membrane, rinse the residual solution on the surface of the membrane with deionized water, then filter and wash with pure isopropanol at room temperature and 0.1MPa fo...

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Abstract

The invention discloses a method for preparing an organic-solvent-resistant ultrafiltration membrane, the prepared ultrafiltration membrane and application of the ultrafiltration membrane. The method for preparing the organic-solvent-resistant ultrafiltration membrane includes the steps of preparing a membrane casting solution, performing precipitation phase inversion, filtering and cleaning an ultrafiltration membrane for the first time, cross-linking the ultrafiltration membrane and filtering and cleaning the ultrafiltration membrane for the second time. The surface layer of the membrane is cross-linked, and a supporting layer is also cross-linked. According to the method, preparation time is short, the technology is simple, and solvents are saved. The prepared ultrafiltration membrane has the advantage of being resistant to organic solvents and has good application prospects in separation of organic solvent systems.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of an organic solvent-resistant ultrafiltration membrane, the prepared ultrafiltration membrane and the application of the ultrafiltration membrane. Background technique [0002] In recent years, organic solvents have been widely used in petrochemical, printing, coking, leather, pesticides, medicine and other fields. They have the characteristics of large output, many types, wide distribution, and many industries involved. These organic solvents have environmental risks and pollution hazards in production, transportation, storage, and use. Traditional methods of separation and recovery of organic solvents, such as extraction and distillation, have the disadvantages of high energy consumption and large solvent loss, and there are often serious secondary pollutions in the process of processing and utilizing these organic solvents. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D61/14B01D67/00
CPCB01D61/145B01D67/0011B01D71/06B01D71/56B01D2323/30B01D2325/30
Inventor 苏保卫黄良伟吕利宋晓娟高学理
Owner OCEAN UNIV OF CHINA
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