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Mixed matrix membrane with high-selectivity gas channel and preparation method

A technology of mixed matrix membranes and gas channels, applied in the field of membrane separation, can solve the problems of low permeability and selectivity of gas separation membranes, the influence of interfacial compatibility on MMMs gas permeation selectivity, interfacial compatibility problems, etc., and achieve good Effects of permeability and selectivity, high selectivity, and easy operation

Active Publication Date: 2020-10-09
中恒新材料科技(山东)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interfacial compatibility defects between the polymer matrix and the filler have a significant impact on the gas permeation selectivity of MMMs.
Although some progress has been made so far, the pitfalls of MMMs have not been completely avoided
[0003] The novel mixed matrix membrane used for gas separation reported in the related art consists of a polymer matrix and organic fillers containing benzene rings, but there is also an interfacial compatibility problem between the polymer matrix and the filler, and the resulting mixed matrix membrane is as follows: CO 2 The permeability coefficient is only 2.69Barrer-397.07Barrer, CO 2 / N 2 The selectivity of the gas separation membrane is only 26-39, and the permeability and selectivity of the resulting gas separation membrane are low

Method used

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  • Mixed matrix membrane with high-selectivity gas channel and preparation method
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  • Mixed matrix membrane with high-selectivity gas channel and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A mixed matrix membrane with highly selective gas channels is prepared by a method comprising the following steps:

[0065] (1) Coating polydimethylsiloxane (PDMS) and polyvinyl alcohol (PVA) on the surface of polysulfone to prepare a hydrophilic modified polysulfone membrane, the specific steps are as follows:

[0066] First, use n-heptane to prepare PDMS into a PDMS n-heptane solution with a concentration of 0.4wt%, and then use a scraper to coat the PDMS n-heptane solution with a concentration of 0.4wt% on the surface of the PSf film with a coating thickness of 0.08 μm, and then controlled the temperature at 60°C and 40% RH to dry for 18 hours to obtain a PDMS-coated PSf film; then soak the PDMS-coated PSf film with an aqueous solution of 0.25wt% PVA for 1 hour, and then Continue to dry for 8 hours under the conditions of controlling the temperature at 30°C and 40% RH to obtain a hydrophilic modified polysulfone membrane, hereinafter referred to as MPSf membrane;

[0...

Embodiment 2

[0078] A mixed matrix membrane with highly selective gas channels is prepared by a method comprising the following steps:

[0079] (1), polydimethylsiloxane (PDMS) and polyvinyl alcohol (PVA) are coated on the surface of polysulfone to prepare hydrophilic modified polysulfone membrane, and concrete steps are with the step of embodiment 1 (1) ), obtain a hydrophilic modified polysulfone membrane, i.e. MPSf membrane;

[0080] (2), adopt low-temperature solid-phase synthesis method, utilize metal salt and ligand to synthesize metal composite hydrophobic filler particle in situ on the surface of the MPSf membrane of step (1) gained, described metal salt is anhydrous copper acetate, just Described ligand is 4-chlorobenzoic acid, and other is with the step (2) of embodiment 1, obtains hydrophobic HMP (Cl) / MPSf film;

[0081] The contact angle of the surface of the hydrophobic HMP(Cl) / MPSf film obtained above is determined to be 140°-145°;

[0082] Using a scanning electron microsc...

Embodiment 3

[0088] A mixed matrix membrane with highly selective gas channels is prepared by a method comprising the following steps:

[0089] (1), polydimethylsiloxane (PDMS) and polyvinyl alcohol (PVA) are coated on the surface of polysulfone to prepare hydrophilic modified polysulfone membrane, and concrete steps are with the step of embodiment 1 (1 ), obtain a hydrophilic modified polysulfone membrane, i.e. MPSf membrane;

[0090] (2), adopt low-temperature solid-phase synthesis method, utilize metal salt and ligand to synthesize metal composite hydrophobic filler particle in situ on the surface of the MPSf membrane of step (1) gained, described metal salt is anhydrous copper acetate, just Described ligand is 4-bromobenzoic acid, and other is with the step (2) of embodiment 1, obtains hydrophobic HMP (Br) / MPSf film;

[0091] The contact angle of the hydrophobic HMP(Br) / MPSf film surface of the above-mentioned gained is measured as 143°-147°;

[0092] Using a scanning electron micros...

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Abstract

The invention discloses a mixed matrix membrane with a high-selectivity gas channel and a preparation method and belongs to the technical field of membrane separation. The preparation method comprisesthe following steps of: coating the surface of polysulfone with polydimethylsiloxane and polyvinyl alcohol to prepare a hydrophilic modified polysulfone membrane; applying a low-temperature solid-phase synthesis method to synthesize metal compound hydrophobic filler particles in situ on the surface of the obtained hydrophilic modified polysulfone membrane by utilizing metal salt and ligand so asto obtain a hydrophobic HMP / MPSf membrane; and finally, coating the surface of the hydrophobic HMP / MPSf membrane with the hydrophilic polymer polyvinylamine for interface self-assembly, and then drying to obtain the mixed matrix membrane with the high-selectivity gas channel. The CO2 permeation rate of the mixed matrix membrane with the high-selectivity gas channel is 1800-3400 GPU; the CO2 permeation coefficient of the mixed matrix membrane is 490-995Barrer; and the CO2 / N2 selectivity of the mixed matrix membrane is preferably 65-70. The mixed matrix membrane is particularly suitable for separation of mixed gas containing carbon dioxide.

Description

technical field [0001] The application discloses a mixed matrix membrane with a highly selective gas channel and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Membrane separation technology has the advantages of high efficiency, greenness, energy saving, and easy processing, and is considered to be a potential gas separation technology. Mixed matrix membranes (Mixed matrix membranes, MMMs), mainly composed of polymers and fillers, have the potential to obtain extremely high permeability and high selectivity. However, the interfacial compatibility defect existing between the polymer matrix and the filler has a significant impact on the gas permeation selectivity of MMMs. Although some progress has been made so far, the drawbacks of MMMs have not been completely avoided. [0003] The novel mixed matrix membrane used for gas separation reported in the related art consists of a polymer matrix and organic fi...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D71/68B01D2257/504
Inventor 乔志华贾雪梦仲崇立孙玉绣黄宏亮郭翔宇
Owner 中恒新材料科技(山东)有限责任公司
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