Grafted ionic liquid polyimide membrane, and preparation method and application thereof

A polyimide membrane and ionic liquid technology, applied in the field of membrane separation, can solve the problems of easy loss, poor mutual solubility, easy rupture of membrane liquid, etc., to increase the permeation resistance, improve the permeation flux, and increase the plasticizing pressure. point and the effect of the service life

Inactive Publication Date: 2019-08-20
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the existing technology, this technology overcomes the problems that the ionic liquid is easy to lose in the membrane, the membrane liquid is easy to break, and the miscibility with the polymer is not good, and at the same time, the plasticizing pressure of the polymer membrane is increased.

Method used

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  • Grafted ionic liquid polyimide membrane, and preparation method and application thereof
  • Grafted ionic liquid polyimide membrane, and preparation method and application thereof
  • Grafted ionic liquid polyimide membrane, and preparation method and application thereof

Examples

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preparation example Construction

[0041] A method for preparing a grafted ionic liquid polyimide membrane, the method comprising the following steps:

[0042] (1) Polyimide grafting: Add the aminated functional ionic liquid to the casting solution formed by polyimide, heat and stir in a water bath, and the aminated functional ionic liquid passes through the characteristic structure of the Schiff base to The base form is grafted on the polymer main chain to obtain an aminated casting solution;

[0043] (2) Preparation of grafted ionic liquid polyimide film: the aminated casting solution in step (1) is scraped and coated to form a film, and the solvent evaporation method is used to obtain a modified film, which is dried to solidify the film, and then After freezing, the membrane was peeled off to obtain a grafted ionic liquid polyimide membrane.

[0044] The thickness of the film is generally controlled within the range of 25 μm ± 4 μm when scraping to form a film.

[0045]Wherein, the preparation method of st...

Embodiment 1

[0062] Take a 250mL or 500mL three-necked round-bottom flask, weigh ethylbromoethylamine hydrobromide and N-butylimidazole at a ratio of 1:1.125, heat in an oil bath, and reflux ethanol for 22-24 hours, evaporate the obtained product to remove ethanol , to obtain a viscous liquid, pour it into a flat-bottomed flask, put it in a vacuum drying oven, and dry it at 80°C for 4 to 6 hours to obtain the intermediate 1-(2-aminoethyl)-3-butylimidazolium bromide . Then, add equimolar KOH to the intermediate, put the product in a vacuum drying oven for 12h to 24h, add an appropriate amount of ethanol, stir and dissolve, and generate a large amount of white solid KBr, remove the impurity KBr, and obtain aminoethyl Butylimidazole Hydrobromide. Finally, the obtained product is subjected to ion exchange reaction with KPF6. After the two were dissolved in ethanol, they were continuously reacted in a water bath at 66°C for 18-20 hours and then taken out. Vacuum filtration removes the genera...

Embodiment 2

[0066] The aminated functional ionic liquid prepared in Example 1 was used.

[0067] First dissolve 10g of polyimide in 90g of N-methylpyrrolidone solvent, heat and stir at 60°C for 8h, then add 0.8g of 1-aminoethyl-3-butylimidazole hexafluorophosphate, continue heating and stirring for 12h, and After the formed casting solution was degassed at room temperature for 12 hours, the casting solution was poured onto a horizontal glass plate and scraped to form a film. Put the glass plate in a vacuum drying oven, volatilize the solvent and water at 60°C to solidify the film, take it out and place it in a -4°C freezer for 15 to 30 minutes, and scrape off the film carefully to obtain the grafted ionic liquid polymer. imide film.

[0068] Under the test conditions of 0.1MPa and 30℃, the permeation flux of carbon dioxide increased from 5.28Barrer to 10.01Barrer, CO 2 / N 2 Selectivity increased from 21.9 to 84.9, CO 2 / CH 4 Selectivity increased from 24.1 to 44.5, CO 2 / O 2 Select...

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Abstract

The invention belongs to the field of membrane separation, and especially relates to a grafted ionic liquid polyimide membrane, and a preparation method and an application thereof. Polyimide is grafted with an aminated functional ionic liquid, then the grafted ionic liquid polyimide membrane is prepared, and the prepared grafted ionic liquid polyimide membrane is used for carbon dioxide gas separation. The modified membrane obtained by the method for immobilizing the ionic liquid on the main chain of the polyimide through a Schiff base structure can increase the carbon dioxide permeation fluxand significantly improve the selectivity of the carbon dioxide gas.

Description

[0001] Technical field: [0002] The invention belongs to the field of membrane separation, and in particular relates to a grafted ionic liquid polyimide membrane, a preparation method and an application thereof. [0003] Background technique: [0004] The rapid development of industry produces a large amount of carbon dioxide gas. Among many carbon dioxide recovery processes, the membrane separation process has the advantages of low energy consumption, environmental friendliness, and simple equipment, which makes it stand out. The core element of the membrane separation process is the membrane material. Common materials used to prepare gas separation membranes include cellulose acetate, polysulfone, polydimethylsilane, polyimide, etc. Among them, polyimide has excellent Mechanical properties, thermal properties, chemical stability, etc., have become the current research hotspots of gas separation membrane materials. However, polyimide has the common problem of other gas separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00B01D53/22
CPCB01D71/64B01D69/02B01D67/0011B01D67/0013B01D53/228B01D2323/38B01D2325/24B01D2257/504Y02C20/40
Inventor 刘红晶贝鹏志姚辉高缨佳张莹
Owner SHENYANG POLYTECHNIC UNIV
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