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Method for preparing high-performance organic gas separation membrane

An organic gas, separation membrane technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of low surface free energy, easy to fall off, high hydrophobicity, etc., to achieve high temperature resistance performance, cost Inexpensive, easy-to-use effects

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the existing problems in the prior art that metal-organic framework materials (MOFs) are easy to fall off or have defects during use as a separation function layer , providing a new method for preparing high-performance organic gas separation membranes, using MOFs to carry out self-assembly reaction on the surface of the base membrane, first preparing the MOFs functional layer, and then coating the MOFs functional layer with thermal cross-linking technology to construct organic Silicon surface protective layer, by adjusting the coating thickness and coating formula, the thickness and surface roughness of the protective layer are controlled to obtain lower surface free energy and higher hydrophobicity, so that this type of organic gas separation membrane In the application process, it has greater separation coefficient, flux, anti-sticking, anti-pollution and other properties, and finally develops a high-performance organic gas separation membrane, which is useful in the field of organic separation

Method used

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  • Method for preparing high-performance organic gas separation membrane
  • Method for preparing high-performance organic gas separation membrane
  • Method for preparing high-performance organic gas separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of the first mixed solution:

[0049] (1A) mixing N, N-dimethylpyrrolidone, terephthalic acid, and zirconium tetrachloride in a molar ratio of 500:1:1 and fully stirring to obtain the solution required for MOFs membrane preparation;

[0050] (1B) After the polypropylene hollow fiber base membrane with a pore size of 500 nm prepared by melt stretching was washed twice with water, washed with ethanol twice and dried, the ratio of the specific surface area of ​​the base membrane to the volume of the MOFs preparation solution was 50:1 (i.e. the surface For 50 square meters of film put 1m 3 solution), put it into the solution required for MOFs preparation to obtain the first mixed solution.

[0051] (2) Preparation of MOFs functional layer: The reactor is sealed, and nitrogen is passed through under dry conditions to protect and exhaust oxygen. Put the first mixed solution prepared in step (1) into a reactor at 150° C., and perform a solvothermal reaction f...

Embodiment 2

[0058] (1) Preparation of the first mixed solution:

[0059] (1A) mixing N, N-dimethylpyrrolidone, terephthalic acid, and zirconium tetrachloride in a molar ratio of 200:1:1 and fully stirring to obtain the solution required for MOFs membrane preparation;

[0060] (1B) After the polypropylene hollow fiber base membrane with a pore size of 200 nm prepared by solution-induced phase separation was washed twice with water, washed with ethanol twice and dried, the ratio of the specific surface area of ​​the base membrane to the volume of the MOFs prepared solution was 10:1 (ie A film with a surface of 10 square meters is placed in 1m 3 solution), put it into the solution required for MOFs preparation to obtain the first mixed solution.

[0061] (2) Preparation of MOFs functional layer: The reactor is sealed, and nitrogen is passed through under dry conditions to protect and exhaust oxygen. Put the first mixed solution prepared in step (1) into a reactor at 150° C., and perform a ...

Embodiment 3

[0067] (1) Preparation of the first mixed solution:

[0068] (1A) mixing N, N-dimethylpyrrolidone, terephthalic acid, and zirconium tetrachloride in a molar ratio of 100:1:1 and fully stirring to obtain the solution required for MOFs membrane preparation;

[0069] (1B) After the 500nm pore diameter polypropylene flat base membrane prepared by thermal phase separation was washed twice with water, washed with ethanol twice and dried, the specific surface area of ​​the base membrane and the volume ratio of the MOFs preparation solution were 1:1 (i.e. A film with a surface of 1 square meter is placed in 1m 3 solution), put it into the MOFs preparation solution to obtain the first mixed solution.

[0070] (2) Preparation of MOFs functional layer: The reactor is sealed, and nitrogen is passed through under dry conditions to protect and exhaust oxygen. Put the first mixed solution prepared in step (1) into a reactor at 200° C., and perform a solvothermal reaction for 2 hours to pre...

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Abstract

The invention provides a method for preparing a high-performance organic gas separation membrane, which comprises the following steps of: (1) preparing a first mixture containing N, N-dimethyl pyrrolidone, terephthalic acid, zirconium tetrachloride and a base membrane; (2) heating the first mixture, and carrying out a reaction to prepare a separation membrane; (3) cleaning the separation membrane to obtain the MOFs organic gas separation membrane. (4) coating the surface of the MOFs organic gas separation membrane prepared in the step (3) with a silane coating solution; and (5) heating the separation membrane obtained in the step (4) to enable the silane coating liquid to be subjected to a cross-linking reaction. According to the method, MOFs are subjected to a self-assembly reaction on the surface of a base membrane, an MOFs functional layer is prepared firstly, and then an organic silicon surface protective layer is constructed outside the MOFs functional layer through a coating thermal crosslinking technology, so that the organic gas separation membrane has the properties of higher separation coefficient, flux, adhesion resistance, pollution resistance and the like in the application process and has a wide application prospect in the field of organic matter separation.

Description

technical field [0001] The invention relates to a method for preparing a high-performance organic gas separation membrane, the high-performance organic gas separation membrane prepared by the method, and its application in separating organic matter, belonging to the technical field of organic gas separation membrane preparation. Background technique [0002] Gas membrane separation technology is a new technology that uses the high-efficiency selective permeability of membrane materials to organic matter to realize the separation of organic matter from the gas phase. It has continuous process, no heat release, no secondary pollution, high recovery rate, low energy consumption and advantages of miniaturization. It is currently the mainstream technology for organic matter separation and volatile organic compound (VOCs) treatment in developed countries, and it has a very wide range of applications in the fields of environmental protection, chemical industry, and biopharmaceutica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/06B01D53/22
CPCB01D67/0002B01D67/0006B01D71/06B01D53/228
Inventor 魏昕郦和生王成鸿孟凡宁杨丽
Owner CHINA PETROLEUM & CHEM CORP
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