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A preparation method of an organic solvent-resistant ultrafiltration membrane, the prepared membrane and its application

A technology that is resistant to organic solvents and ultrafiltration membranes, applied in the field of membrane separation, can solve the problems of easy swelling and limited application scope, and achieve the effects of improving mass transfer speed, shortening membrane preparation time, and saving solvents.

Active Publication Date: 2019-05-14
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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  • A preparation method of an organic solvent-resistant ultrafiltration membrane, the prepared membrane and its application
  • A preparation method of an organic solvent-resistant ultrafiltration membrane, the prepared membrane and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0041] Use a flat film scraper to uniformly scrape the defoaming casting film on the polyester non-woven fabric, control the height of the scraper, and scrape into a film at room temperature to form a coating with a thickness of 150μm; after scraping The coating is allowed to stand and 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 gel phase transformation and precipitates on the surface of the non-woven fabric. ;

[0042] Then take out the membrane, rinse the residual solution on the membrane surface with deionized water, and then filter and clean with p...

Embodiment 2

[0052] After 2.5g of polyimide, 0.14g of polyethylene glycol 400 and 11.25g of N,N-dimethylformamide are uniformly mixed, they are mechanically stirred at 55°C for 5h to fully dissolve them, and then use high-speed centrifugation The machine is centrifuged and degassed at 1500r / min for 15min at room temperature to obtain the casting liquid;

[0053] Use a flat film scraper to uniformly scrape the defoamed casting film on the polyester non-woven fabric, control the height of the scraper to scrape into a film at room temperature, and form a coating with a thickness of 150μm; The coating is allowed to stand and 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 into a film on the surface of the non-woven fabric;

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

Embodiment 3

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

[0060] Use a flat film scraping machine to uniformly scrape the prepared casting solution on the polyester non-woven fabric, control the height of the scraper to scrape into a film at room temperature, and form a coating with a thickness of 120μm; the coating after scraping Let it stand and evaporate in the air at room temperature for 20 seconds, and then immerse it 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 into a film on the surface of the non-woven fabric;

[0061] Then take out the membrane, rinse the residual solution on the membrane surface with deionized water, and then filter and clean with pure isopro...

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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 specifically 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 petrochemicals, printing, coking, leather, pesticides, medicine and other fields. They have the characteristics of large output, multiple types, wide distribution, and multiple industries. These organic solvents have environmental risks and pollution hazards in terms of 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 pollution in the process of processing and using these organic solvents. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(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