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Preparation method of mixed matrix membrane based on porous core-shell filler

A technology of mixed matrix membranes and fillers, which is applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of reduced gas selectivity and weak interaction, and achieve improved selectivity, controllable reactions, and preparation processes. simple effect

Inactive Publication Date: 2021-04-09
SHIHEZI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a mixed matrix membrane based on a porous core-shell filler, which solves the problem that the weak interaction between the existing single ZIF-8 and the polymer matrix will form voids in the membrane, resulting in most The gas can pass through the gap, resulting in a decrease in gas selectivity, resulting in problems such as "game" effects

Method used

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  • Preparation method of mixed matrix membrane based on porous core-shell filler
  • Preparation method of mixed matrix membrane based on porous core-shell filler
  • Preparation method of mixed matrix membrane based on porous core-shell filler

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preparation example Construction

[0040] The preparation method of ZIF-8@AC comprises the following steps:

[0041] Step1: Add 0.84g MgCl2·6(H2O) into 20mL ethanol at room temperature, sonicate for 1h until it is completely dissolved to obtain a mixed solution;

[0042] Step2: Add 1.3 mL of 3-aminopropyltriethoxysilane (APTES) dropwise to the above-mentioned dissolved solution under the condition of magnetic stirring, and stir it overnight;

[0043] Step3: Based on the above steps, the precipitate was collected by centrifugation, washed three times with ethanol, and then dried in a vacuum oven at a drying temperature of 60°C for 24 hours to obtain an amino clay (AC) filler;

[0044] Step4: Weigh 0.02 g of the AC filler obtained above and dissolve it in 5 mL of hydroalcoholic solution (60 / 40, v / v) at room temperature, then adjust the pH of the solution to neutral to obtain neutral sexual solution;

[0045] Step5: Add 0.117g of Zn(NO3)2 6(H2O) to the neutral solution, sonicate for 1h until completely dissolved, ...

Embodiment 1

[0060] The Pebax / ZIF-8@AC-3 mixed matrix membrane was prepared. The thickness of the mixed matrix membrane was 98 μm. The mixed matrix membrane used Pebax as the membrane matrix, and ZIF-8@AC was added to the membrane matrix. Among them, Pebax and ZIF- The mass ratio of 8@AC is 0.97:0.03, and the preparation method of the mixed matrix membrane is as follows:

[0061] Step 1. Preparation of ZIF-8@AC:

[0062] Add 0.84g MgCl2 6H2O into 20mL ethanol at room temperature, sonicate for 1h until it dissolves completely. Then, under the condition of magnetic stirring, 1.3 mL of 3-aminopropyltriethoxysilane (APTES) was dropped into the above-mentioned dissolving solution dropwise, and stirred overnight. Finally, the precipitate was collected by centrifugation, washed three times with ethanol, and dried in a vacuum oven at 60°C for 24 hours to obtain an amino clay (AC) filler.

[0063] Weigh 0.02 g of the AC filler obtained above and dissolve it in 5 mL of hydroalcoholic solution (60 / ...

Embodiment 2

[0069] Prepare Pebax / ZIF-8@AC-5 mixed matrix membrane, the difference from Example 1 Pebax / ZIF-8@AC-3 mixed matrix membrane is: the thickness of the membrane is 101 μm, wherein, Pebax and ZIF-8@AC The mass ratio is 0.95:0.05. The difference between the preparation of the mixed matrix membrane and the preparation method of Example 1 is that in step 3, the weighing of 0.0162g ZIF-8@AC is changed to weighing of 0.027g ZIF-8@AC; Finally, a mixed matrix membrane with a thickness of 101 μm was obtained. figure 2 It is a scanning electron microscope sectional view of the Pebax / ZIF-8@AC-5 mixed matrix membrane prepared in Example 2.

[0070] Under the conditions of 25°C and 2bar, the Pebax / ZIF-8@AC-5 mixed matrix membrane prepared in Example 2 was used for the separation test of CO2 / CH4 mixed gas with a CO2 volume fraction of 20% under wet conditions. The CO2 flux is 516 Barrer and the CO2 / CH4 selectivity is 30.

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Abstract

The invention discloses a preparation method of a mixed matrix membrane based on a porous core-shell filler, and relates to the technical field of gas separation membranes. The mixed matrix membrane based on the porous core-shell filler comprises ZIF-8@AC, the mixed matrix membrane is prepared by using the ZIF-8@AC as the filler, the membrane thickness of the Pebax / ZIF-8@AC mixed matrix membrane is 90-110 microns, and the Pebax / ZIF-8@AC mixed matrix membrane consists of 3wt%-9wt% of ZIF-8@AC and 91%-97% of Pebax. The Pebax / ZIF-8@AC mixed matrix membrane prepared by the method has the advantages of simple preparation process, controllable reaction, cheap and easily available raw materials and mild conditions, the advantages of a metal organic framework and a polymer matrix are combined, unsaturated metal sites and an amino carrier are introduced into the membrane through ZIF-8@AC filling, a synergistic promotion effect on CO2 is realized, a channel is constructed for promoting CO2 transmission, and the CO2 separation performance of the mixed matrix membrane is enhanced.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, in particular to a preparation method of a mixed matrix membrane based on a porous core-shell filler. Background technique [0002] In today's society, driven by the growing population demand and economic pressure, China's energy consumption has been on the rise, especially the consumption of non-renewable fossil energy such as coal, oil, and natural gas has increased sharply, making people enjoy life. While being convenient, it is also facing an energy crisis. In order to alleviate the energy crisis caused by non-renewable fossil energy, biogas is used as an important renewable and clean energy in people's lives. However, freshly collected biogas usually contains CO2 The presence of acidic impurity gases such as CO2 will affect the combustion calorific value and transport capacity of biogas. Therefore, CO2 removal is a necessary treatment process for freshly collected biogas, an...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/14B01D71/80B01D53/22
CPCB01D71/80B01D69/148B01D67/0079B01D53/228Y02C20/40
Inventor 李雪琴吕侠丁思远黄路张金利
Owner SHIHEZI UNIVERSITY
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