Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Application of polyimide in gas separation membrane

A technology of gas separation membrane and polyimide, which is applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of separation selectivity and gas permeability that cannot be improved at the same time, and achieve good mechanical properties and thermal properties. Stability, good solubility, and the effect of increasing free volume

Pending Publication Date: 2022-07-08
ZHEJIANG UNIV OF TECH
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of traditional polyimide gas separation selectivity and gas permeability that cannot be improved at the same time, the present invention provides a polyimide and its preparation method and its application in gas separation membranes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Application of polyimide in gas separation membrane
  • Application of polyimide in gas separation membrane
  • Application of polyimide in gas separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, the polyimide has the structure of the following formula:

[0047]

[0048]The preparation of polyimide gas separation membrane mainly includes the following steps:

[0049] Under the protection of nitrogen atmosphere, 0.5841g (1.3mmol) of 2,2'-diphenyl-4,4',5,5'biphtalic dianhydride and 0.3668 (1.3mmol) of 3,9-diamino -4,10-Dimethyl-6H,12H-5,11-methyldiphenyl[b,f][1,5]diazacine and 0.0855g (0.65mmol) benzoic acid were placed in a three-neck polymerization flask , then add 3.80g of anhydrous m-cresol to make the solid content of the whole system 20wt%, adjust the mechanical stirring to about 200r / min, heat the system to 80 °C and stir for 2h to make it completely dissolved, forming a relatively transparent Light yellow solution, after the solid is completely dissolved, the system is heated to 180 ° C for thermal imidization, the reaction is about 10h to complete thermal imidization of polyimide, and 4.76g of m-cresol is added to reduce the solid ...

Embodiment 2

[0053] In this embodiment, the polyimide has the structure of the following formula;

[0054]

[0055] The preparation of polyimide gas separation membrane mainly includes the following steps:

[0056] Under the protection of nitrogen atmosphere, 1.5049g (2.58mmol) of 2,2'-bis(2"-trifluoromethylphenyl)-4,4',5,5'biphtalic dianhydride and 0.7253g (2.58mmol) 3,9-diamino-4,10-dimethyl-6H,12H-5,11-methyldiphenyl[b,f][1,5]diazacine and 0.1578g (1.29 mmol) benzoic acid in a three-necked polymerization bottle, then add 8.92 g of anhydrous m-cresol to make the solid content of the entire system 20 wt%, adjust the mechanical stirring to about 200 r / min, and heat the system to 80 ° C and stir for 2 h It was completely dissolved to form a relatively transparent pale yellow solution. After the solid was completely dissolved, the system was heated to 180 ° C for thermal imidization, and the polyimide was reacted for about 10 h to complete thermal imidization, and then 13.63 g of m-forma...

Embodiment 3

[0060] In this embodiment, the polyimide has the structure of the following formula;

[0061]

[0062] The preparation of polyimide gas separation membrane mainly includes the following steps:

[0063] Under the protection of nitrogen atmosphere, 0.8074g (1.12mmol) 3,3"',5,5"'-tetrafluoromethyl-[1,1':2',1":2",1"' -Tetraphenyl]-4,4',5,5'-tetracarboxylic dianhydride and 0.2807g (1.12mmol) 3,9-diamino-4,10-dimethyl-6H,12H-5,11- Methyldiphenyl[b,f][1,5]diazacine and 0.0850g (0.56mmol) benzoic acid were placed in a three-neck polymerization bottle, and then 4.49g anhydrous m-cresol was added to make the solid content of the whole system is 20 wt%, adjust the mechanical stirring to about 200 r / min, heat the system to 80 °C and stir for 2 h to make it completely dissolved, forming a relatively transparent pale yellow solution, after the solid is completely dissolved, the system is heated to 180 °C for thermal sublimation. Amination, the polyimide was completely thermally imidize...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Permeability coefficientaaaaaaaaaa
Permeability coefficientaaaaaaaaaa
Login to View More

Abstract

The invention discloses an application of polyimide in a gas separation membrane, which is characterized in that 2, 2 '-disubstituted BPDA-based dianhydride with a twisted structure series is introduced and polymerized with different types of aromatic diamines to obtain the polyimide as shown in a formula (I), the gas separation membrane prepared from the obtained polyimide has good solubility in various organic solvents, improves the permeation capacity and specific surface area of gas, has good mechanical properties and thermal stability, has good selectivity while improving the permeation capacity, and plays an important role in gas separation;

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, in particular to the application of a polyimide in a gas separation membrane. Background technique [0002] The gas separation membrane was developed and put into practical use as a commercial membrane for hydrogen separation in the 1980s. The gas separation membrane is performed by the difference in the gas permeation rate of the membrane, and the target gas is concentrated and separated in a mixture of two or more gases. Gas separation membrane technology is a rising "green technology". It is widely used for its low energy consumption, simple equipment and small footprint. It is widely used in hydrogen separation, carbon dioxide separation, air separation, air dehumidification, and organic solvent separation. play a very important role. [0003] Polyimide can be used in gas separation membranes because of its good film-forming properties, solvent resistance, heat resistance...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G73/10B01D53/22B01D71/64
CPCC08G73/1067C08G73/1085C08G73/1039C08G73/1007B01D71/64B01D53/228Y02P20/151
Inventor 陈爱民杨萌萌
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com