Preparation method of novel MOF-based hydrogel gas separation membrane

A gas separation membrane and gas separation technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of restricting industrial expansion application, cumbersome synthesis conditions, high purity requirements, etc., to improve separation selectivity, The preparation method is simple and the effect of improving the separation performance

Active Publication Date: 2021-10-22
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interfacial compatibility issue has always been an important factor limiting its optimal gas separation performance
Commonly used interfacial solvents are mostly ionic liquids (Ionic Liquids, ILs), long-chain macromolecules, etc., but due to their high economic cost, tedious synthesis conditions and high purity requirements, the industrial expansion application is greatly limited.

Method used

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  • Preparation method of novel MOF-based hydrogel gas separation membrane
  • Preparation method of novel MOF-based hydrogel gas separation membrane
  • Preparation method of novel MOF-based hydrogel gas separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0039] Example 1-6: Preparation of A520 Hydrogel Gas Separation Membranes with the Same Polymerized Precursor Water Content and Different MOF Contents

[0040] (1) Preparation of A520

[0041] At room temperature, dissolve 7g of aluminum sulfate octadecahydrate in 30mL of water in a glass reactor, and heat the mixed solution to 60°C; weigh fumaric acid (2.43g) and sodium hydroxide (2.52g), dissolve it in 36mL of water and heat up to 60°C After that, slowly add it dropwise to the aqueous solution of aluminum sulfate, the formed white suspension is centrifuged at 9000rpm, washed with water for 3 times, then vacuum-dried at 100°C for 24h to obtain A520 white powder;

[0042] (2) Preparation of polymeric precursor solution

[0043] At room temperature, weigh 2 g of acrylic acid, 1 g of acrylamide, and 0.02 g of N,N'-methylenebisacrylamide and add them to 10 mL of water. After mixing evenly, add 1.11 g of sodium hydroxide to adjust the pH of the solution to neutral, and then add ...

Embodiment 7-11

[0053] Example 7-11: Preparation of A520 Hydrogel Gas Separation Membrane with Same Loading Capacity and Different Water Content of Polymerized Precursors

[0054] (1) The preparation of A520 is the same as step (1) in Example 1;

[0055] (2) Preparation of polymeric precursor solution

[0056] At room temperature, weigh 2 g of acrylic acid, 1 g of acrylamide, and 0.02 g of N,N'-methylenebisacrylamide and add it to a certain amount of water (see the table below for the amount of water), mix well, and then add 1.11 g of sodium hydroxide to adjust the pH of the solution to Neutral, then add 0.3985g A520 (A520 content is 11.6%), 0.015g photoinitiator Irgacure 2959 in the reactor, mix well and set aside;

[0057]

[0058]

[0059] (3) the preparation of film material is with embodiment one step (3)

[0060] Figure 7 : Under dry gas conditions, the CO of A520 hydrogel gas separation membranes with the same A520 content and different polymerization precursor water content ...

Embodiment 12

[0061] Example 12: Preparation and repeated use of A520 hydrogel gas separation membrane with MOF content of 16.24%

[0062] (1) The preparation of A520 is the same as step (1) in Example 1;

[0063] (2) Preparation of polymeric precursor solution

[0064] Among them, A520 content is 16.24%;

[0065] (3) the preparation of film material is with embodiment one step (3)

[0066] Figure 8 is the 6-time reused CO 2 / CH 4 Mixed gas separation performance diagram; because both A520 and hydrogel polymer chains can form hydrogen bonds with water, the membrane still retains CO after 6 cycles 2 The permeation rate of 390Barrer, CO 2 / CH 4 The selectivity is 45.

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Abstract

The invention discloses a preparation method of a novel MOF-based hydrogel gas separation membrane. The preparation method comprises the following steps: introducing a water-stable metal-organic framework material into a hydrogel polymer precursor solution, and adopting an ultraviolet-initiated free radical polymerization method, to prepare the MOF-based hydrogel gas separation membrane with a good carbon dioxide separation performance in one step. The prepared membrane is of a self-supporting type, water is adopted as a solvent, on one hand, the interface compatibility of MOF in the membrane and a polymer matrix is improved, and the interface non-selection defect is eliminated; and on the other hand, water has an effect of promoting CO2 transmission, and more gas permeation transmission channels are provided for CO2. The membrane prepared by the invention has the advantages of green and environment-friendly raw materials, simple preparation method and mild conditions, is suitable for separation of water-stable MOF and various gas systems in different water environments, is suitable for industrial production, and provides reference for expanding the application of the MOF-based mixed matrix hydrogel membrane in gas separation.

Description

technical field [0001] The invention relates to the field of gas membrane separation, in particular to a preparation method of a novel MOF-based hydrogel gas separation membrane. Background technique [0002] Gas separation membrane technology has the advantages of green and low energy consumption, high efficiency and sustainability, small equipment footprint, high separation efficiency, and easy operation. It has been widely used in natural gas purification, hydrogen storage, carbon dioxide (CO 2 ) capture and other fields, showing broad application prospects, and providing technical support for promoting chemical energy conservation and emission reduction, efficient and clean utilization of energy, and realizing "carbon peak" and "carbon neutrality". As one of the typical representatives of many membrane materials, MOF-based mixed matrix membranes (Metal-organicframeworks based Mixed matrix membranes) integrate the processability of polymer matrix and the excellent separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D53/22C08F283/00C08F222/02C08F220/06C08F220/56C08F222/38C08F2/48
CPCB01D71/56B01D67/0006B01D53/228C08F283/00C08F2/48C08F222/02C08F220/06C08F220/56C08F222/385Y02P20/151
Inventor 仲崇立田磊孙玉绣乔志华黄宏亮郭翔宇
Owner TIANJIN POLYTECHNIC UNIV
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