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Fluorine-containing polyimide hollow fiber membrane and preparation method thereof

A fluorine-containing polyimide, polyimide technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of poor permeability of polyimide hollow fibers, etc., to improve free volume, Good mechanical properties, avoiding the effect of slow gas permeation rate

Active Publication Date: 2020-08-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above background content, the object of the present invention is to overcome the defects of poor permeability of polyimide hollow fibers spun from rigid monomers, and improve the permeability of polyimide hollow fiber membranes by introducing fluorine-containing monomers into the rigid system for copolymerization. performance while keeping its selectivity unchanged, and the spun fluorine-containing polyimide hollow fiber membrane is used for CO 2 / N 2 , CO 2 / CH 4 separation of mixtures

Method used

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  • Fluorine-containing polyimide hollow fiber membrane and preparation method thereof
  • Fluorine-containing polyimide hollow fiber membrane and preparation method thereof
  • Fluorine-containing polyimide hollow fiber membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Using dimethylacetamide (DMAC) as a solvent, take hexafluorodianhydride (6FDA), biphenyltetralic acid dianhydride (BPDA), and diaminodiphenyl ether (ODA) at a ratio of 5:5:10 The molar ratio was reacted at 25° C. for 4 hours to prepare a polyamic acid solution with a solid content of 20 wt%.

[0037] (2) Use the polyamic acid solution in (1) as the spinning liquid, put it in the feed liquid tank for degassing for 24 hours, and spin the polyamic acid hollow fiber, wherein the first coagulation bath is water and DMAC, and the temperature is 25 ℃, the second coagulation bath is water, and the temperature is 25 ℃.

[0038](3) Cut the polyamic acid hollow fiber membrane in step (2) into small sections of 100 cm, put it into water for solvent exchange for 5 hours, take it out, wipe off the moisture on the surface, place it in isopropanol and exchange it for 30 minutes, repeat three times; Place in n-pentane and exchange for 30min, repeat three times, so as to obtain PAA ...

Embodiment 2

[0044] Polyimide hollow fiber S2 is obtained according to the method of embodiment 1, the difference is,

[0045] The molar ratio of hexafluorodianhydride (6FDA), biphenyltetralic acid dianhydride (BPDA), and diaminodiphenyl ether (ODA) was changed to 3:7:10.

Embodiment 3

[0047] The polyimide hollow fiber S3 was prepared according to the method of Example 1, except that the diaminodiphenyl ether was replaced by equimolar diaminodiphenylmethane (MDA).

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Abstract

The invention relates to the technical field of gas separation membranes, in particular to a preparation method of a fluorine-containing polyimide hollow fiber membrane and application thereof to separation of CO2 / N2 and CO2 / CH4 mixtures. In fluorine-containing polyimide hollow fiber, polyimide adopts a structural formula shown as a formula (1). The invention further provides a fiber membrane prepared from the hollow fiber and a preparation method and related application thereof.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a preparation method of a fluorine-containing polyimide hollow fiber membrane and its application in CO 2 / N 2 , CO 2 / CH 4 Separation applications of mixtures. Background technique [0002] Resource depletion, water scarcity, and variable climatic conditions make energy, water treatment and recycling, and global warming major global concerns. Seeking clean energy and reducing the emission of carbon dioxide into the atmosphere are important strategies to solve the current energy shortage and global warming problems. [0003] Membrane separation method is a new generation of "green" gas separation technology. Its principle is to use pressure as the driving force to achieve the purpose of separation by means of the different permeation rates of various components in the gas in the membrane. In 1831, J.K.Mitchell first revealed the possibility of using membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D69/08B01D67/00B01D53/22
CPCB01D53/228B01D67/0009B01D69/08B01D71/64Y02C20/40
Inventor 武德珍肖美凤李建华牛鸿庆田国峰
Owner BEIJING UNIV OF CHEM TECH