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A kind of preparation method of multi-layer il@mof composite film

A multi-layer composite membrane and composite membrane technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of low flux of polymer membranes and restrict industrial development, and achieve high flux, good mechanical strength, good separation effect

Active Publication Date: 2021-06-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the commercial membranes currently used in gas separation are polymer membranes. Although polymer membranes have good processability and large-scale production, the low flux of polymer membranes greatly limits the development of the industry.

Method used

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  • A kind of preparation method of multi-layer il@mof composite film
  • A kind of preparation method of multi-layer il@mof composite film
  • A kind of preparation method of multi-layer il@mof composite film

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Each single-layer composite membrane and bilayer and triple-layer membranes will be prepared for H 2 , CO 2 、CH 4 , N 2 The pure group of gases is tested for permeation to obtain the gas flux.

[0030] Place the [TETA]L@MOF film in the mold respectively, seal it well, and measure the H 2 , CO 2 、CH 4 , N 2 , it is necessary to keep the gas circulating for more than 2 h before each measurement to ensure that no other gas affects the experimental results. Then use a soap bubble flowmeter to test the gas flux after the gas passes through the membrane and test the gas flux of the membrane under different pressure drops for comparison. After the measurement, the durability of the membrane was detected, and the gas flow was maintained for 100 h to judge the durability of the membrane.

example 2

[0032] Each single-layer composite membrane and bilayer and triple-layer membranes will be prepared for H 2 / CO 2 、CH 4 / CO 2 , N 2 / CO 2 The mixed gas is used for permeation test to obtain gas flux and separation selectivity.

[0033] Place the [TETA]L@MOF film in the mold respectively, seal it well, and open the H 2 and CO 2 Two gas cylinders are used to maintain the same inlet pressure and flow rate of the two gases. Before each measurement, the two gases need to be kept in circulation for more than 2 hours to ensure that no other gases affect the experimental results. Then use He as the protective gas to load the mixed gas sieved through the membrane into the gas chromatograph, and the gas chromatograph detects the proportion of the two gases to be tested, and calculates the gas flux of the two gases to be tested, and then tests The gas fluxes of the membranes at different pressure drops were compared. Test CH sequentially as above 4 / CO 2 and N 2 / CO 2 mixed ...

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Abstract

A composite membrane of multi-layer ionic liquid and MOF is prepared by layer-by-layer deposition method, which belongs to a new type of composite membrane material. The multilayer composite film prepared by [TETA]L and MOF pair H 2 / CO 2 It has high separation performance. The preparation method we invented can prepare double-layer and triple-layer composite membranes of ionic liquid and MOF. Bilayer composite membrane pair H 2 / CO 2 The separation selectivity of the three-layer composite membrane is 53 for H 2 / CO 2 The separation selectivity of 67, H 2 Throughput up to 125461 barrer. The membrane material we prepared has ultra-high gas flux and effective separation performance, and achieves step-by-step separation through layer-by-layer accumulation to improve the H 2 / CO 2 The separation effect has an important reference significance for the preparation and application of membrane materials in the future.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a method for preparing a multi-layer IL@MOF composite membrane formed by loading ionic liquid on MOF. Background technique [0002] In industry, for gas separation and solvent purification, processes such as pressure swing adsorption and cryogenic distillation are generally used. Compared with these energy-intensive processes, membrane technology separation methods are more efficient due to effective energy management, ease of operation and cost savings. of industrial significance. Specific examples include the separation of hydrogen and hydrocarbons from gases, the upgrading of biogas and landfilled waste gases, the treatment of flue gases, the purification of methane and the dehydration of organic solvents. Most of the commercial membranes currently used in gas separation are polymer membranes. Although polymer membranes have good processability and large-scale production,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D53/22B01D53/02B01D53/14
CPCB01D53/02B01D53/1475B01D53/1493B01D53/228B01D53/229B01D67/0002B01D69/02B01D69/12B01D2252/30B01D2253/204B01D2257/504B01D2325/24Y02C20/40
Inventor 刘大欢魏鵾鹏韩国鹏
Owner BEIJING UNIV OF CHEM TECH
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