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Mixed matrix membrane, preparation method and application thereof

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: 2021-12-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Mixed matrix membrane, preparation method and application thereof
  • Mixed matrix membrane, preparation method and application thereof
  • Mixed matrix membrane, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of porous metal-organic cage complex ZRT-1-4F

[0035] Mix 7.5g of zirconocene, 2.5g of tetrafluoroterephthalic acid and 50mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10mL of water, sonicate until the mixture is uniform to obtain a reaction solution; then put Put it in an oven at 65°C for 8 hours to react. After the reaction, 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 successively. , and finally dried under vacuum at 65°C to obtain the porous metal-organic cage complex ZRT-1-4F.

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

[0037] The CO of the porous metal-organic c...

Embodiment 2

[0039] Example 2 Preparation of porous metal-organic cage complex ZRT-1-4F

[0040] Mix 7.5g of zirconocene, 2.5g of tetrafluoroterephthalic acid and 50mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10mL of water, sonicate until the mixture is uniform to obtain a reaction solution; then put Put it in an oven at 55°C for 12 hours to react. After the reaction, the reaction liquid is cooled and centrifuged (a large amount of white powder is formed during the reaction), and the obtained solid is washed three times with N,N-diethylformamide (DEF) and dichloromethane successively. , 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 7.5g of zirconocene, 2.5g of tetrafluoroterephthalic acid and 50mL of N,N-dimethylacetamide (DMA), and sonicate until dissolved; then add 10mL of water, sonicate until the mixture is uniform to obtain a reaction solution; then put Put it into an oven at 85°C for 9 hours to react. After the reaction, 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, a preparation method and application thereof, and belongs to the fields of material science and gas separation. The mixed matrix membrane comprises a high-molecular polymer and a porous metal-organic cage complex ZRT-1-4F, wherein the content of the porous metal-organic cage complex ZRT-1-4F in the mixed matrix membrane is 1-12 wt%. According to the invention, the porous metal-organic cage complex ZRT-1-4F filled in the mixed matrix membrane is different from a traditional inorganic filling material, wherein the separation performance of the membrane is better along with the increase of the filling amount of the traditional inorganic filling material in the mixed matrix membrane, and the porous metal-organic cage complex ZRT-1-4F prepared by the method has the best separation performance when the filling amount is low (3.2 wt%), and then the separation performance of the membrane is reduced along with the increase of the filling amount of the porous metal-organic cage complex ZRT-1-4F.

Description

technical field [0001] The invention relates to the field of material science and gas separation, in particular to a mixed matrix membrane and its preparation method and application. Background technique [0002] Gas separation membrane technology is to use 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, to obtain the enriched material of easily permeable gas on the permeate side, and to obtain the separation of impermeable gas on the non-permeate 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 in the gas separation process of organic membrane materials, that is, the increase in gas permeability decreases the selectivity (Trade-off effect), and vice versa. In order to solve this problem, in the prior art, inorganic fillers are usually ...

Claims

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Application Information

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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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