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A kind of mixed matrix membrane and its preparation method and application

A mixed matrix membrane and mixed dissolution technology, which is applied in the field of material science and gas separation, can solve the problems of reducing the amount of metal-organic framework materials, limiting the wide application of mixed matrix membranes, and irregular morphology, so as to avoid interface defects problems, overcoming interface defects, and ease of industrial application

Active Publication Date: 2022-07-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing mixed matrix membrane has the following defects: poor interfacial compatibility, poor uniformity of film formation, irregular morphology, high surface roughness, etc. The reasons for the above defects are: (1) currently used to prepare mixed matrix membranes Metal-organic framework materials are almost insoluble in organic solvents, which makes metal-organic framework materials can only be dispersed in organic solvents in the form of particles, and cannot exist in organic solvents with molecular structures, which eventually makes the formed mixed matrix film have an interface Poor compatibility, poor film uniformity, irregular shape, high surface roughness and other defects; (2) Metal-organic framework materials are easy to agglomerate and form large particle materials, so metal-organic framework materials with larger particles are used as additives When the material is used, it will further reduce the interfacial compatibility between the metal-organic framework material and the polymer, thereby reducing the contact area between the metal-organic framework material and the polymer and reducing the amount of the metal-organic framework material added.
The defects existing in the above-mentioned existing mixed matrix membranes will seriously reduce the separation performance of mixed matrix membranes, which seriously limits the wide application of mixed matrix membranes, and most of MOF mixed matrix membranes (MMMs) are flat membranes, which have low energy efficiency in industrial applications. Low

Method used

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  • A kind of mixed matrix membrane and its preparation method and application
  • A kind of mixed matrix membrane and its preparation method and application
  • A kind of mixed matrix membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of Porous Metal-Organic Cage Complex ZRT-1-4F

[0035] Mix 7.5 g of zirconocene, 2.5 g of tetrafluoroterephthalic acid with 50 mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10 mL of water, and sonicate until mixed to obtain a reaction solution; then put The reaction was carried out in an oven at 65°C for 8 hours. After the reaction was completed, the reaction solution was cooled and centrifuged (a large amount of white powder was formed during the reaction), and the obtained solid was washed three times with N,N-diethylformamide (DEF) and dichloromethane in turn. , and finally dried under vacuum at 65 °C to obtain the porous metal-organic cage complex ZRT-1-4F.

[0036] Result: N of the porous metal-organic cage complex ZRT-1-4F prepared in this example at 77K 2 Adsorption diagram such as figure 1 shown; by figure 1 It can be seen that the prepared ZRT-1-4F has a microporous structure.

[0037] CO of the porous metal...

Embodiment 2

[0039] Example 2 Preparation of Porous Metal-Organic Cage Complex ZRT-1-4F

[0040] Mix 7.5 g of zirconocene, 2.5 g of tetrafluoroterephthalic acid with 50 mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10 mL of water, and sonicate until mixed to obtain a reaction solution; then put The reaction was carried out in an oven at 55°C for 12 hours. After the reaction was completed, the reaction solution was cooled and centrifuged (a large amount of white powder was formed during the reaction), and the obtained solid was washed three times with N,N-diethylformamide (DEF) and dichloromethane in turn. , and finally dried under vacuum at 65 °C to obtain the porous metal-organic cage complex ZRT-1-4F.

Embodiment 3

[0041] Example 3 Preparation of Porous Metal-Organic Cage Complex ZRT-1-4F

[0042] Mix 7.5 g of zirconocene, 2.5 g of tetrafluoroterephthalic acid with 50 mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10 mL of water, and sonicate until mixed to obtain a reaction solution; then put The reaction was carried out in an oven at 85°C for 9 hours. After the reaction was completed, the reaction solution was cooled and centrifuged (a large amount of white powder was formed during the reaction), and the obtained solid was washed three times with N,N-diethylformamide (DEF) and dichloromethane in turn. , and finally dried under vacuum at 65 °C to obtain the porous metal-organic cage complex ZRT-1-4F.

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Abstract

The invention discloses a mixed matrix membrane and a preparation method and application thereof, belonging to the fields of material science and gas separation. The mixed matrix membrane includes high molecular polymer and porous metal-organic cage complex ZRT-1-4F. The content of the porous metal-organic cage complex ZRT-1-4F in the mixed matrix membrane is 1-12 wt%. The porous metal-organic cage complex ZRT-1-4F filled in the mixed matrix membrane of the present invention is different from the traditional inorganic filling material. The traditional inorganic filling material is that with the increase of the filling amount in the mixed matrix membrane, the membrane The separation performance is better; while the porous metal-organic cage complex ZRT-1-4F prepared by the present invention has the best separation performance at a lower filling amount (3.2wt%), and then with the increase of its filling amount The separation performance of the membrane decreases with increasing.

Description

technical field [0001] The invention relates to the field of material science and gas separation, in particular to a mixed matrix membrane and a preparation method and application thereof. Background technique [0002] The gas separation membrane technology uses different gases in the mixed gas to have different permeation rates to the membrane material under the pressure of the gas on both sides of the membrane, and obtains the enriched material of the permeable gas on the permeable side, and obtains the separation of the non-permeable gas on the non-permeable side. gas, so as to achieve the purpose of gas separation. At present, the commonly used gas separation membrane materials are mainly organic membrane materials. There is an upper limit for organic membrane materials in the gas separation process, that is, the increase in gas permeability leads to a decrease in selectivity (Trade-off effect), and vice versa. To solve this problem, in the prior art, inorganic fillers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/14B01D67/00B01D71/64B01D53/22
CPCB01D69/141B01D67/0011B01D71/64B01D53/228
Inventor 谢亚勃张瑞丽刘桐欣
Owner BEIJING UNIV OF TECH
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