Preparation method of low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs material

A mixed-matrix membrane and high-selectivity technology, applied in the field of membrane separation, can solve problems such as easy-to-produce defects, selectivity reduction, and large gas transmission resistance, so as to increase gas permeation rate, reduce mass transfer distance, and reduce mass transfer The effect of resistance

Pending Publication Date: 2020-09-04
DALIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, despite the rich pores of MOFs, the incorporation of MOFs still has a large gas transmission resistance, which hinders the improvement of gas permeation rate, and there is still a compatibility problem between MOFs and the matrix, which is easy to produce in the process of membrane formation. defect, which reduces the selectivity

Method used

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  • Preparation method of low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs material
  • Preparation method of low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs material
  • Preparation method of low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of nano-sized hollow ZIF-8: Weigh 120mg of zinc nitrate hexahydrate and 66.4mg of 2-methylimidazole and dissolve them in 32ml of methanol, mix them after stirring and dissolving, then add 176mg of polystyrene to it, and ultrasonically 5min, react in a water bath at 70°C for 30min, cool to room temperature after the reaction, rinse with deionized water and absolute ethanol 5 times alternately, then dissolve the product in DMF, etch for 48h, and wash by centrifugation to obtain the desired polystyrene-modified hollow MOFs microsphere materials.

[0030] Preparation of Pebax solution: Weigh 3.09g of Pebax-1657 particles and add it to 100g of ethanol / water (70 / 30) mixed solution, condense and reflux at 80°C for 4 hours, and transfer the solution to a container for later use after cooling naturally.

[0031] Preparation of mixed matrix membrane: Add hollow MOFs microsphere material with a mass percentage of 5%, 10% or 15% to 8g Pebax-1657 solution, stir for 1h an...

Embodiment 2

[0033] Tests have shown that the low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs prepared in this example, under the test conditions of 25 ° C and 0.1 MPa, CO 2 The permeability coefficient can reach 172.4Barrer, CO 2 / N 2 The selectivity was 87.9.

[0034] The hollow MOFs microsphere material of the present invention achieves polystyrene modification while preparing the hollow structure, and has the advantages of simple synthesis steps, and the polystyrene on the surface can make the hollow MOFs microsphere material and the matrix better compatible properties, prepare defect-free mixed matrix membranes, and obtain high gas selectivity; the hollow structure can reduce the mass transfer resistance of the membrane and increase the gas permeability of the membrane.

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Abstract

The invention discloses a preparation method of a low-resistance and high-selectivity mixed matrix membrane based on a hollow MOFs material, and belongs to the technical field of membrane separation.The preparation method comprises the following steps: firstly, taking nano-sized carboxylated polystyrene as a hard template, enabling MOFs to grow on the surface of polystyrene, preparing nano-scalehollow MOFs microspheres through DMF etching, and blending the prepared hollow MOFs material with a polymer matrix to obtain the mixed matrix membrane. According to the preparation method, the nanoscale hollow MOFs are used as the filler, and the nanoscale MOFs material is beneficial to improving the compatibility between the MOFs and the matrix, so that the defect-free mixed matrix membrane is prepared, and the selectivity is improved; and besides, due to the existence of the hollow structure, the mass transfer distance of the mixed matrix membrane can be effectively reduced, so that the masstransfer resistance of the membrane is reduced, and the gas permeation rate is increased.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing a low-resistance and high-selectivity mixed matrix membrane based on hollow MOFs materials. Background technique [0002] Carbon dioxide is the most prominent greenhouse gas in the greenhouse effect, and its separation and capture has been extensively studied. At present, the separation of carbon dioxide mainly includes absorption method, adsorption method and membrane separation method. Due to the advantages of low energy consumption, easy operation, and easy coupling, membrane separation technology has become a research hotspot for carbon dioxide separation. [0003] Gas membranes mainly include inorganic membranes and organic membranes. Organic membranes are widely used in hydrogen separation, oxygen and nitrogen enrichment, and natural gas purification. However, as early as 1991, Robeson proposed that the separation performance ...

Claims

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Application Information

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IPC IPC(8): B01D71/72B01D69/02B01D67/00B01D53/22C08G83/00
CPCB01D53/228B01D67/0011B01D69/02B01D71/72B01D2257/504C08G83/008
Inventor 郑文姬丁锐贺高红代岩焉晓明阮雪华杨凯
Owner DALIAN UNIV OF TECH
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