Membrane and preparation method and application thereof

A film cooling and metal-organic framework technology, applied in the field of membrane separation, can solve the problems of low metal-organic framework loading, reduced specific surface area, poor separation effect, etc., and achieves excellent separation effect, easy operation and cost saving effect.

Active Publication Date: 2021-01-19
ZHONGNENG KETAI BEIJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process, the participation of organic solvents is required, the cost is high, and it is not conducive to the environment
The loading of MOFs in MOF membranes prepared by this method is low, and during the production process, the pores of MOFs are easily filled by polymers, resulting in a decrease in the specific surface area, which leads to their separation during the separation process. Poor effect, low membrane flux

Method used

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  • Membrane and preparation method and application thereof
  • Membrane and preparation method and application thereof
  • Membrane and preparation method and application thereof

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preparation example Construction

[0040] The preparation method of the membrane of the present invention will be described in detail below. The proportions or percentages (%) involved in the present invention refer to mass proportions or mass percentages unless otherwise specified.

[0041] The invention discloses a new membrane preparation method, comprising:

[0042] (1) Mix the metal-organic framework material with the polymer and the pore protecting agent, melt and stir at the first temperature until the mixture is uniform, and obtain a molten mixture;

[0043] (2) Under the second temperature and the first pressure, the homogeneously mixed molten mixture is subjected to hot-pressing treatment to obtain a formed initial metal-organic framework membrane;

[0044] (3) Cool the initial metal-organic framework membrane to room temperature, soak and wash the initial metal-organic framework membrane with a pore protecting agent remover, and dry to obtain a metal-organic framework membrane.

[0045] As for the ...

Embodiment 1

[0063] With ZrCl 4 As a metal source, 2-aminoterephthalic acid (NH 2 -BDC) for the preparation of metal-organic frameworks for organic ligands, the freshly prepared metal-organic frameworks were activated with dichloromethane. Mix 50 parts by mass of the activated metal-organic framework with 37.5 parts by mass of high-density polyethylene (Alfa aser; number: 041731) and 12.5 parts by mass of ultra-high molecular weight polyethylene (Alfa aser; number: 043951), and then Add 100 parts by mass of paraffin oil (sigma Aldrich; number: M8691). The mixture was kept stirring at 160° C. for 10 minutes. Then, at 80° C. and 0.5 MPa pressure, plate heating and pressure treatment was performed to obtain an initial film. After cooling to room temperature, the initial membrane was soaked and washed with dichloromethane repeatedly, and then dried to obtain the membrane of Example 1, in which the MOF loading was 50%. Characterization was performed using scanning electron microscopy and X-...

Embodiment 2

[0066] With Cu(NO 3 ) 2 As the metal source, trimesic acid is used as the organic ligand to prepare metal-organic framework materials. The freshly prepared MOFs were activated with dichloromethane. Mix 70 parts by mass of the activated metal-organic framework with a total of 30 parts by mass of ultra-high molecular weight polyethylene (Alfa aser; number: 043951) and polyvinylidene fluoride (Alfa aser; number: 044080) (ultra-high molecular weight polyethylene The mass ratio with polyvinylidene fluoride is 2:1), and then add 170 parts by mass of paraffin oil. Stirring of the mixture was continued at 200°C for 10 minutes. Then, the initial film was obtained by performing hot-pressing treatment on rollers at 120° C. and 0.8 MPa. After cooling to room temperature, the initial membrane was soaked and washed with dichloromethane repeatedly, and then dried to obtain the membrane of Example 2. The MOF loading in the obtained film was 70%. Use scanning electron microscope and X-ra...

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Abstract

The invention provides a preparation method of a membrane, wherein the preparation method comprises the steps: mixing a metal organic framework material with a polymer and a pore passage protective agent, and melting and stirring at a first temperature until the materials are uniformly mixed to obtain a molten mixture; carrying out hot-pressing treatment on the uniformly mixed molten mixture at asecond temperature and under a first pressure to obtain a molded initial metal organic framework membrane; and cooling the initial metal-organic framework membrane to room temperature, impregnating the initial metal-organic framework membrane with a pore passage protective agent remover, washing the initial metal-organic framework membrane, and drying the initial metal-organic framework membrane to obtain the metal-organic framework membrane. The method can be used for preparing the metal organic framework membrane with large loading capacity, and the prepared metal organic framework membraneis high in pore channel retention rate and has excellent selectivity and separation performance. Moreover, the preparation method is simple to operate, does not use a substrate and a solvent, saves the cost, and is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a metal organic framework membrane, a metal organic framework membrane prepared by the method and an application thereof. Background technique [0002] Metal organic framework material is a novel nanoporous crystalline material, its structure is composed of metal ions or clusters connected with a variety of organic ligands in the form of strong coordination bonds. The wide variety of organic ligands and inorganic components enable MOFs to form diverse topologies and satisfying structures. Due to the many advantages of the metal organic framework itself: adjustable pore size, very high specific surface area, strong functionality, adjustable size, etc., all these advantages make the metal organic framework membrane containing metal organic framework materials become the first choice in membrane separation engineering. Ideal material....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/06C02F1/44C02F101/30
CPCB01D67/0002B01D69/02B01D71/06C02F1/44B01D2325/02C02F2101/308
Inventor 韩若丹
Owner ZHONGNENG KETAI BEIJING TECH CO LTD
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