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Application of polyimide in gas separation

A polyimide and gas separation technology, applied in the field of polymers, can solve the problems of limited application and low membrane permeability, and achieve the effects of high specific surface area, low cost and good application prospects

Inactive Publication Date: 2018-04-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although traditional polyimide has good selectivity, its membrane permeability is often low, which limits its application in the field of gas separation membranes.

Method used

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  • Application of polyimide in gas separation
  • Application of polyimide in gas separation
  • Application of polyimide in gas separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the present embodiment, the structural formula of polyimide is as follows:

[0061]

[0062] The specific preparation method is: under the protection of nitrogen, add 1.4285g of 2,2',3,3'-biphenyltetracarboxylic dianhydride into a branch bottle, then add 2.45g of triethylamine and 15mL of ethanol, and heat to 80°C Stir magnetically until it is completely dissolved, and continue stirring under reflux for 1 hour after dissolution, then connect the water separator and increase the amount of nitrogen, take out the ethanol until the solution system becomes viscous and cannot be stirred by the magnet, add 0.7975g dissolved in 4mL N-methylpyrrolidone Tetramethyl-p-phenylenediamine, then add 1mL toluene, react at 80°C for one hour, then raise the temperature to 190°C, react for several hours until the reaction system becomes viscous and cannot be stirred, then cool down to 80°C and add 5mL N-methylpyrrolidone dilution. The solution was poured into ethanol to give a filam...

Embodiment 2

[0066] In the present embodiment, the structural formula of polyimide is as follows:

[0067]

[0068] The specific preparation method is: under the protection of nitrogen, add 0.8925g of 2,2',3,3'-biphenyltetracarboxylic dianhydride into a branch bottle, then add 1.53g of triethylamine and 15mL of ethanol, and heat to 80°C Stir magnetically until it is completely dissolved. After dissolving, continue to reflux and stir for 1 hour, then connect the water separator and increase the amount of nitrogen, take out the ethanol until the solution system becomes viscous and cannot be stirred by the magnet, add 0.7291g dissolved in 4mL N-methylpyrrolidone 3,3',5,5'-Tetramethylbenzidine, then add 1mL of toluene, react at 80°C for one hour, then raise the temperature to 190°C, react for several hours until the reaction system becomes viscous and cannot be stirred, then cool down to 80°C ℃ and add 5mL N-methylpyrrolidone for dilution. The solution was poured into ethanol to give a fil...

Embodiment 3

[0072] In the present embodiment, the structural formula of polyimide is as follows:

[0073]

[0074] The specific preparation method is: under the protection of nitrogen, add 0.7863g of 2,2',3,3'-biphenyltetracarboxylic dianhydride into a branch bottle, then add 1.35g of triethylamine and 15mL of ethanol, and heat to 80°C Stir magnetically until it is completely dissolved. After dissolving, continue to reflux and stir for 1 hour, then connect the water separator and increase the amount of nitrogen, take out the ethanol until the solution system becomes viscous and cannot be stirred by the magnet, add 0.9683g dissolved in 4mL N-methylpyrrolidone Add 2,2-bis(3-amino-4-methylphenyl)hexafluoropropane, then add 1mL of toluene, react at 80°C for one hour, then raise the temperature to 190°C, and react for several hours until the reaction system becomes viscous and cannot be stirred by the magnet Cool down to 80°C and add 5 mL of N-methylpyrrolidone to dilute. The solution was ...

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Abstract

The invention provides application of polyimide with a structure presented by a formula I (shown in the description) in gas separation. By introducing 2,2',3,3'-biphenyl tetracarboxylic acid dianhydride with a twisted structure to be polymerized with diamine monomers, polyimide with good film forming capacity is obtained. Synthesized polyimide is relatively low in cost, has relatively large specific surface area and good thermal heat stability, gas selectivity and gas permeability and further has good application prospects in the field of gas separation.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to the application of polyimide in gas separation. Background technique [0002] In the past few decades, in the field of gas separation (GS), microporous materials with a pore size of less than 2nm, such as organic-inorganic hybrid metal-organic frameworks (MOFs), covalent organic frameworks (COFs), hypercrosslinked polymers Microporous materials (HCPs) and conjugated polymer microporous materials (MCPs) have been greatly developed. [0003] However, polymer-based separation membranes have attracted extensive attention because of their ease of preparation, controllability, and low energy consumption compared with traditional low-temperature distillation and absorption gas separation technologies. A good gas separation membrane should have good gas permeability and correspondingly high gas selectivity. In 1991, Robeson proposed that gas permeability and gas sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22C08G73/10
CPCB01D53/228C08G73/1007C08G73/1067
Inventor 阎敬灵胡小凡王震
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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