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A kind of preparation method of gas separation membrane with high MOF filler content

A gas separation membrane and filler content technology, applied in the field of membrane separation, can solve problems such as unsatisfactory mechanical properties and reduced separation selectivity

Active Publication Date: 2021-09-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filler content in the membrane material prepared in this way cannot be too high (generally less than 30%). When the filler content exceeds the "threshold value", the separation selectivity of the membrane will be greatly reduced, and the mechanical performance is unsatisfactory.

Method used

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  • A kind of preparation method of gas separation membrane with high MOF filler content
  • A kind of preparation method of gas separation membrane with high MOF filler content
  • A kind of preparation method of gas separation membrane with high MOF filler content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.5 g of the activated ZIF-8 powder into 20 mL of dichloromethane, and ultrasonicate the water bath for 30 minutes to completely disperse ZIF-8 in the dichloromethane. Add a certain amount of PVDF into dimethyl sulfoxide, stir to dissolve to prepare 7.5wt% membrane liquid. Take 3.33g of membrane solution and add it to the above-mentioned UiO-66 dispersion solution, and continue to sonicate for 60 minutes. The dichloromethane in the mixed solution is fully volatilized by stirring and volatilizing to obtain a viscous casting solution. Pour the prepared casting solution onto the prepared glass plate, scrape off a film with a thickness of 200 μm at a certain speed with a scraper, then put the glass plate into a preheated oven at 70°C, and wait until the dimethylmethylene After the sulfone volatilized, the prepared membrane was removed. Place the dried membrane on a PTFE plate Add 3g of Pebax 1657 solution prepared at 3wt% to the glass circle. Put the PTFE plate int...

Embodiment 2

[0026] Add 0.6 g of activated UiO-66 powder into 30 mL of chloroform, and ultrasonicate the water bath for 30 minutes to completely disperse UiO-66 in chloroform. Add a certain amount of PEG600000 into water, stir to dissolve to prepare 8wt% membrane liquid. Take 3.25g of membrane solution and add it to the above UiO-66 dispersion, and continue to sonicate for 60 minutes. The chloroform in the mixed solution is fully volatilized by stirring and volatilizing to obtain a viscous casting solution. Pour the prepared casting solution onto the prepared glass plate, scrape out a film with a thickness of 250 μm at a certain speed with a scraper, then put the glass plate into a preheated oven at 70°C, wait until the DMF volatilizes and take it out. Prepared membranes. Place the dried membrane on a PTFE plate Add 4 g of a prepared 3 wt % polydimethylsiloxane solution to the glass ring. Put the PTFE plate into a preheated oven to remove the solvent to obtain a high MOF content gas s...

Embodiment 3

[0029] Add 0.5 g of activated UiO-66 powder into 20 mL of acetone, and ultrasonicate the water bath for 30 minutes to completely disperse UiO-66 in acetone. Add a certain amount of PVDF into DMF, stir to dissolve to prepare 7.5wt% membrane liquid. Take 1.3g of membrane solution and add it to the above-mentioned UiO-66 dispersion solution, and continue to sonicate for 60 minutes. The acetone in the mixed solution is fully volatilized by stirring and volatilizing to obtain a viscous casting solution. Pour the prepared casting solution onto the prepared glass plate, scrape a film with a thickness of 300 μm at a certain speed with a scraper, then put the glass plate into a preheated oven at 70°C, wait until the DMF volatilizes and take it out. Prepared membranes. Place the dried membrane on a PTFE plate Into the glass ring, add 4g of a prepared 3wt% polyetherimide solution. Put the PTFE plate into a preheated oven to remove the solvent to obtain a high MOF content gas separat...

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Abstract

The invention discloses a method for preparing a gas separation membrane with high MOF filler content, and belongs to the technical field of membrane separation. Disperse MOF particles in a solvent to prepare MOF "ink", and then mix the "ink" with the polymer solution in a water bath and ultrasonically make the two compatible. The film solution obtained after the solvent evaporated was poured on a glass plate and scraped to remove the solvent to obtain a film with a high MOF filler content. Finally, the obtained membrane is immersed in an appropriate amount of polymer solution, and the solvent is completely volatilized to obtain a high-MOF filler gas separation membrane with high gas separation performance. The membrane can avoid the problem of agglomeration caused by excessive filler content in traditional mixed matrix membranes, which leads to the degradation of separation performance. Its MOF filler content can reach up to 70%, and it shows the 2 / N 2 , CO 2 / CH 4 、H 2 / N 2 、H 2 / CO 2 With moderate selectivity for such gas pairs, the gas permeability coefficient can reach thousands of barrers, which is expected to meet the requirements of practical industrial applications.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a gas separation membrane with high MOF filler content. Background technique [0002] CO 2 As a greenhouse gas, it interacts with N in different industrial processes 2 , H 2 , CH 4 The separation of such gases is of great significance. In the field of traditional gas separation, the shortcomings of high energy consumption and complicated operation have prompted people to look for new alternative separation technologies. Membrane separation technology is a new separation technology that can be used for gas capture. Compared with traditional separation methods, it has the advantages of no phase change, regeneration process without mass separation agent, mild process conditions, low operating cost, and small footprint. , has developed rapidly in recent years. [0003] Membrane materials are a key part of membrane separation techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/70B01D71/68B01D71/64B01D71/38B01D71/34B01D71/06B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D71/06B01D71/34B01D71/38B01D71/64B01D71/68B01D71/70
Inventor 郑文姬郭自兴孙天奇焉晓明代岩贺高红
Owner DALIAN UNIV OF TECH
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