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A polyimide membrane for biogas purification and decarbonization and its preparation method

A technology of polyimide membrane and biogas, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problem of low gas permeability of polyimide membrane, achieve no phase change and chemical change, effect Remarkable, good separation effect

Active Publication Date: 2021-06-22
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned technical problems, the present invention provides a polyimide membrane for biogas purification and decarburization and a preparation method thereof, and selects pyromellitic dianhydride (PMDA), 4,4-diaminodiphenyl Ether (ODA), N,N-dimethylacetamide (DMAC), self-made uio-66 (Zr) and ZIF-8 (Zn), using sulfonation reaction or nitration reaction to prepare a series of side chain polyimide Amine / Organometallic Framework Compound Hybrid Membrane Material, the purpose of which is to modify the disadvantage of low gas permeability of polyimide membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Synthesis of side chain polyimide-uio-66(Zr) hybrid membrane and CH 4 / CO 2 Separation experiment process

[0031] Firstly, pyromellitic dianhydride is introduced into sulfo group through sulfonation reaction:

[0032] At a temperature of 78°C, add 80% concentrated sulfuric acid dropwise to pyromellitic anhydride, and stir while adding. After the dropwise addition, stir and react for 20 hours to obtain the sulfonated product of pyromellitic anhydride. Pyromellitic dianhydride (PMDA); the molar ratio of concentrated sulfuric acid and pyromellitic anhydride is 3:2;

[0033] Add 0.02 mol of sulfopyromellitic dianhydride (dried in vacuum at 130°C for 6 h before use) and 4,4-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 into 80 ml of N , in a 250mL round-bottomed flask of N-dimethylacetamide (DMAC) solvent, at room temperature, under airtight and nitrogen-protected conditions, magnetically stirred for 6h and polycondensed to obtain side chain sulfopolyamic acid...

Embodiment 2

[0041] 1) Synthesis of side chain polyimide-uio-66(Zr) hybrid membrane and CH 4 / CO 2 Separation experiment process

[0042] This step is different from Example 1 in that pyromellitic anhydride introduces nitro groups, and a nitro polyimide / uio-66 hybrid membrane is prepared.

[0043] The pyromellitic dianhydride is introduced into the nitro group through the nitration reaction:

[0044] At 30°C, in the presence of concentrated sulfuric acid and concentrated nitric acid, nitro groups are introduced into pyromellitic anhydride, and the molar ratio of concentrated sulfuric acid, concentrated nitric acid and pyromellitic anhydride is 3:3:2 to obtain nitric acid Pyromellitic dianhydride (PMDA);

[0045] Take 0.02 mol of nitropyromellitic dianhydride (dried in vacuum at 130°C for 6 h before use) and 4,4-diaminodiphenyl ether (ODA) at a molar ratio of 1:1 into 80 ml of N , in a 250mL round-bottomed flask of N-dimethylacetamide (DMAC) solvent, at room temperature, under airtight ...

Embodiment 3

[0053] 1) Synthesis of side chain polyimide-ZIF-8(Zn) hybrid membrane and CH 4 / CO 2 Separation experiment process

[0054] Firstly, pyromellitic dianhydride is introduced into sulfo group through sulfonation reaction,

[0055] At a temperature of 80°C, add 80% concentrated sulfuric acid dropwise to pyromellitic anhydride, and stir while adding. After the dropwise addition, stir and react for 21 hours to obtain the sulfonated product of pyromellitic anhydride. Pyromellitic dianhydride (PMDA); the molar ratio of concentrated sulfuric acid and pyromellitic anhydride is 3:2;

[0056] Add 0.02 mol of sulfopyromellitic dianhydride (dried in vacuum at 130°C for 6 h before use) and 4,4-diaminodiphenyl ether (ODA) with a molar ratio of 1:1 into 80 ml of N , in a 250mL round-bottomed flask of N-dimethylacetamide (DMAC) solvent, at room temperature, under airtight and nitrogen-protected conditions, magnetically stirred for 6h and polycondensed to obtain side chain sulfopolyamic acid;...

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Abstract

The invention relates to the technical field of polymer material synthesis, in particular to a polyimide membrane used for biogas purification and decarburization. The preparation method of the polyimide membrane comprises the following steps: (1) pyromellitic anhydride Sulfonation or nitration (2) Preparation of side-chain polyamic acid (3) Preparation of uio-66(Zr) / ZIF-8(Zn) organometallic framework compound (4) Side-chain polyimide-uio- Preparation of 66(Zr) / ZIF‑8(Zn) hybrid membrane, the polyimide membrane has a microporous structure, CO 2 and CH 4 The permeability coefficient is 80‑85 times that of traditional polyimide membranes, CO 2 / CH 4 The separation factor is 23-30, therefore, the polyimide membrane can be used as a separation membrane in the field of biogas purification and decarbonization.

Description

technical field [0001] The invention relates to the fields of polymer material synthesis technology and biogas decarbonization, in particular to a polyimide membrane used for biogas purification and decarburization and a preparation method thereof. Background technique [0002] In today's increasingly serious energy crisis, the use of fossil fuels is increasing with the advancement of science and technology and the development of human society. However, traditional fossil fuels are a non-renewable resource, and as people continue to exploit them, their reserves are becoming less and less. Therefore, searching for a renewable clean energy source has become the most important energy strategic policy of all countries in the world. Biomass energy reserves are extremely rich, and it is the main component of renewable energy. It is also the most promising renewable energy for industrialization and scale, and occupies an important position in the energy structure of various countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D67/00B01D69/12B01D53/22C10L3/10C08G73/10C08G83/00
CPCB01D53/228B01D69/125B01D71/64C08G73/1007C08G73/1064C08G73/1071C08G83/008C10L3/104Y02C20/20Y02P20/151Y02C20/40
Inventor 王强丁保宏张鹏军邓桂春臧良树
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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