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Structure, preparation method and application of anti-plasticizing effect polyimide copolymer gas separation membrane

A technology of gas separation membrane and polyimide, applied in separation methods, chemical instruments and methods, gas fuels, etc.

Active Publication Date: 2022-07-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN102604091A and CN105985521A disclose a polyimide containing an imidazole ring, which is composed of aromatic diamine and heterocyclic diamine monomer 6-aminophenyl-2-aminobenzimidazole mixed in a certain proportion with dianhydride mono The body is reacted in an organic solvent to form a polyimide, but only the preparation method is provided and the analysis of the separation performance and anti-plasticizing effect of this polyimide to gas is not involved.

Method used

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  • Structure, preparation method and application of anti-plasticizing effect polyimide copolymer gas separation membrane
  • Structure, preparation method and application of anti-plasticizing effect polyimide copolymer gas separation membrane
  • Structure, preparation method and application of anti-plasticizing effect polyimide copolymer gas separation membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Under nitrogen protection, in a 250mL three-necked flask equipped with a mechanical stirrer, first add 6FAP (1.0000g, 6.6mmol) and imidazole diamine (1.5080g, 6.6mmol), then add anhydrous NMP (100mL), wait for After the diamine was completely dissolved, PMDA (2.9038 g, 13.2 mmol) was added, and the solution was reacted at 20° C. for 5 h to obtain the corresponding polyamic acid solution.

[0019] 2. Add 0.1 g of isoquinoline and 50 mL of 1,2-dichlorobenzene to the polyamic acid solution obtained in step 1, and continue to react at a temperature of 175-200 ° C for 12-24 h to obtain a polyimide solution; after cooling The obtained polyimide solution was slowly poured into stirring anhydrous methanol, and the precipitate was washed with anhydrous methanol for several times, filtered, and continuously dried under vacuum at 120° C. for 12 h to obtain a polyimide solid.

[0020] 3. At room temperature, the polyimide solid obtained in step 2 is dissolved in a mixed solution...

Embodiment 2

[0023] 1. Under nitrogen protection, in a 100mL three-necked flask equipped with a mechanical stirrer, first add BIDA (1.2000g, 5.3mmol) and ODA (1.0697g, 5.3mmol), then add anhydrous NMP (30mL), wait for the diamine After complete dissolution, 6FDA (4.7261 g, 10.6 mmol) was added, and the corresponding polyamic acid solution was obtained after 5 h of reaction at room temperature.

[0024] 2. Add 0.4 g of isoquinoline and 15 mL of xylene to the polyamic acid solution obtained in step 1, and continue the reaction at 175-200 ° C for 12-24 h to obtain a polyimide solution; then the obtained polyamide The imine solution was slowly poured into the stirring anhydrous methanol, and the precipitate was washed with anhydrous methanol for many times, filtered, and continuously dried under vacuum at 150 °C for 12 h to obtain a polyimide solid.

[0025] 3. At room temperature, the polyimide solid obtained in step 2 is dissolved in DMF to prepare a polyimide solution with a concentration o...

Embodiment 3

[0030] 1. Under nitrogen protection, in a 100mL three-necked flask equipped with a mechanical stirrer, first add BIDA (2.0000g, 9.0mmol) and ODA (0.5943g, 3.0mmol), then add anhydrous NMP (30mL), wait for the diamine After complete dissolution, 6FDA (5.2513 g, 12.0 mmol) was added, and the corresponding polyamic acid solution was obtained after 5 h of reaction at room temperature.

[0031] 2. Add 0.5 g of isoquinoline and 15 mL of xylene to the polyamic acid solution obtained in step 1, and continue to react at 175-200 ° C for 12-24 h to obtain a polyimide solution; then the obtained polyamide The imine solution was slowly poured into the stirring anhydrous methanol, and the precipitate was washed with anhydrous methanol for many times, filtered, and continuously dried under vacuum at 150 °C for 12 h to obtain a polyimide solid.

[0032]3. At room temperature, the polyimide solid obtained in step 2 is dissolved in DMF to prepare a polyimide solution with a concentration of 2%....

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Abstract

The invention discloses a structure, a preparation method and application of an anti-plasticizing effect polyimide copolymer gas separation membrane. The polyimide copolymer with excellent film-forming property is obtained by introducing the diamine monomer containing hydroxyl and imidazole ring and the dianhydride monomer for polymerization. Hydroxyl and imidazole ring N-H bonds can form hydrogen bonds among molecular chains and charge transfer complexes, so that the plasticizing resistance and separation selectivity of the gas separation membrane are improved. A flat sheet membrane or a hollow fiber gas separation membrane prepared from the copolymer through a coating or dry jet wet spinning method has the advantages of low cost, good plasticizing resistance and thermal stability, excellent mechanical strength, good chemical corrosion resistance, relatively high gas permeability and selectivity and the like. The gas separation membrane has good prospects in CO2 separation in the fields of shale gas, oil field gas, coal bed gas, biological natural gas and the like and many applications related to CO2 membrane separation.

Description

technical field [0001] The invention relates to the structure, preparation method and application of an anti-plasticizing effect polyimide copolymer gas separation membrane, and belongs to the technical field of polyimide material and membrane separation. Background technique [0002] Membrane gas separation technology has many advantages such as high energy efficiency, less investment, less land occupation, simple equipment operation, green and pollution-free, and represents a new direction for the development of green gas separation in the future. Gas separation membranes with excellent performance usually have high gas permeability, high separation selectivity and good stability. Conventional polymer gas separation membranes in the separation of CO-rich 2 of high-pressure gas mixtures due to CO 2 The dissolution of the polymer makes the polymer molecular chain swell, the molecular chain spacing increases, and the gas separation selectivity increases with the CO 2 The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00B01D53/22C10L3/10C10K1/00
CPCB01D71/64B01D69/02B01D67/0002B01D53/228C10L3/104C10K1/005Y02C20/40
Inventor 张锁江罗双江谢威单玲珑蔡治礼巩莉丽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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