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A mixed matrix membrane with high acid resistance for methane/nitrogen separation, its preparation method and application

A technology of mixed matrix membrane and methane, which is applied in the field of membrane separation, can solve problems such as inability to achieve separation, and achieve good acid stability

Active Publication Date: 2022-03-08
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

[0005] The purpose of this application is to address the above mentioned for CH 4 / N 2 Membranes for separation such as ZIF membranes have been dissolved under weak acid conditions (pH = 6), and it is impossible to achieve pH 3-5 for CH 4 / N 2 Separation and other technical problems, and provide a methane / nitrogen separation mixed matrix membrane with high acid resistance and its preparation method and application, so as to realize the CH4 under acidic conditions. 4 / N 2 to separate

Method used

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  • A mixed matrix membrane with high acid resistance for methane/nitrogen separation, its preparation method and application
  • A mixed matrix membrane with high acid resistance for methane/nitrogen separation, its preparation method and application
  • A mixed matrix membrane with high acid resistance for methane/nitrogen separation, its preparation method and application

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preparation example 1

[0070] The preparation of ZIF-8 nanoparticles, concrete steps are as follows:

[0071] (1) Dissolve 2-methylimidazole and zinc nitrate 6-water in 100ml of methanol respectively to obtain a methanol solution of 2-methylimidazole with a concentration of 10g / L and 6-hydronic nitric acid with a concentration of 12g / L Methanol solution of zinc;

[0072] (2) Mix the methanol solution of 2-methylimidazole with a concentration of 10g / L and the methanol solution of zinc nitrate 6-water with a concentration of 12g / L obtained above, and let it stand for 24 hours, then use methanol to control the rotation speed to 300 Centrifugal cleaning at -500r / min until the effluent is clear, and then drying at a temperature of 80°C to obtain ZIF-8 nanoparticles with a particle size of 40-50nm;

[0073] The amount of the methanol solution of 2-methylimidazole and the methanol solution of zinc nitrate 6-water used in the above mixing is 3:1 according to the molar ratio of 2-methylimidazole:zinc nitrat...

preparation example 2

[0075] The preparation of ZIF-8 nanoparticles, concrete steps are as follows:

[0076] (1) Dissolve 2-methylimidazole and 6-zinc nitrate in methanol respectively to obtain a methanol solution of 2-methylimidazole with a concentration of 14g / L and a 6-zinc nitrate with a concentration of 12g / L methanol solution;

[0077] (2) Mix the methanol solution of 2-methylimidazole with a concentration of 14g / L and the methanol solution of zinc nitrate 6-water with a concentration of 12g / L obtained above, and let it stand for 24 hours to control the rotation speed to 300 with methanol Centrifugal cleaning at -500r / min until the effluent is clear, and then drying at a temperature of 80°C to obtain ZIF-8 nanoparticles with a particle size of 40-50nm;

[0078] The amount of the methanol solution of 2-methylimidazole and the methanol solution of zinc nitrate 6-water used in the above mixing is 3.11:1 according to the molar ratio of 2-methylimidazole:zinc nitrate 6-water.

preparation example 3

[0080] The preparation of ZIF-8 nanoparticles, concrete steps are as follows:

[0081] (1) Dissolve 2-methylimidazole and zinc nitrate 6-water in methanol respectively to obtain a methanol solution of 2-methylimidazole with a concentration of 14.69g / L and a 6-water nitric acid with a concentration of 16.24g / L Methanol solution of zinc;

[0082] (2) Mix the methanol solution of 2-methylimidazole with a concentration of 14.69g / L and the methanol solution of zinc nitrate 6-water with a concentration of 16.24g / L obtained above, and let it stand for 24 hours to control the rotation speed with methanol Centrifugal cleaning at 300-500r / min until the effluent is clear, and then drying at a temperature of 80°C to obtain ZIF-8 nanoparticles with a particle size of 40-50nm;

[0083] The amount of the methanol solution of 2-methylimidazole and the methanol solution of zinc nitrate 6-water used in the above mixing is 4:1 according to the molar ratio of 2-methylimidazole:zinc nitrate 6-wat...

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Abstract

The application belongs to the technical field of membrane separation, and discloses a mixed matrix membrane with high acid resistance for methane / nitrogen separation, a preparation method and an application. The mixed matrix membrane with high acid resistance for methane / nitrogen separation is a layered structure, which is composed of a PSf membrane layer, a hydrophilic layer and a PAA-ZIF-8@VR layer from bottom to top, and the hydrophilic layer is Polydimethylsiloxane and polyvinyl alcohol are coated on the surface of the PSf film layer and dried, and the PAA‑ZIF‑8@VR layer is obtained by combining polyacrylic acid aqueous solution and ZIF‑8@VR nanoparticles with a carbonized layer on the surface It is obtained by coating on the surface of the hydrophilic layer after mixing for interfacial self-assembly and then drying. The mixed matrix membrane has an acid resistance of pH 2‑5, tested at pH 3, 25 °C and 1 bar, and its resistance to CH 4 Penetration rate is 1179‑2900GPU, CH 4 / N 2 The selectivity is 2.20‑3.12.

Description

technical field [0001] The application discloses a methane / nitrogen separation mixed matrix membrane with high acid resistance, a preparation method and application thereof, and belongs 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. [0003] The main component of unconventional natural gas is CH 4 and nitrogen (N 2 ), the N of shale gas 2 The content is usually between 6vol% and 10vol%, and the N in coalbed methane 2 The content is usually between 30vol%~70vol%, and also contains a small amount of hydrogen sulfide, carbon dioxide and alkanes. After unconventional natural gas has been pretreated by alcohol amine solution absorption method for desulfurization and decarbonization and solid adsorption method for dehydration, the gas still contains a trace amount of hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/14B01D69/02B01D69/12B01D67/00B01D53/22C10L3/10C07C7/144C07C9/04
CPCB01D69/148B01D69/02B01D69/12B01D69/125B01D67/0079B01D53/228C10L3/105C07C7/144C10L2290/548B01D2323/02B01D2325/36C07C9/04
Inventor 乔志华顾振杰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