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Polyimide gas separation membrane material, and preparation and application thereof

A technology of gas separation membrane and polyimide, which is applied in the field of polyimide polymer, can solve the problems of unrelated separation performance and low selectivity, and achieve the effect of good solubility and good film formation

Inactive Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Since the climax of gas separation membrane research was set off in the 1970s, almost all existing polymer materials that can be formed into membranes have faced common problems in gas separation: membranes with good gas permeability have low selectivity; as well
The material has high carbon dioxide permeability and high carbon dioxide / methane selectivity, but the separation performance of this polyimide for other gases is not covered in this patent

Method used

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  • Polyimide gas separation membrane material, and preparation and application thereof
  • Polyimide gas separation membrane material, and preparation and application thereof
  • Polyimide gas separation membrane material, and preparation and application thereof

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Embodiment

[0027] Place a 100mL four-necked round-bottomed flask with mechanical stirring, nitrogen inlet and outlet, and a thermometer in a constant temperature water bath. Dissolve 0.01 mol of diamine monomer MPDSALi salt in 20 mL of NMP. Then 0.01 molar 6FDA was added together with another 20 mL of NMP. The solution was stirred at room temperature for 24 hours to form a viscous polyamic acid solution; then 0.05 mole of acetic anhydride and 0.05 mole of triethylamine were added for imidization, and the polymer was allowed to settle in methanol after reacting for 20 hours at room temperature. It was washed three times with methanol, filtered, air-dried at room temperature for 1 hour, and then dried in a vacuum oven at 100-250° C. for 24 hours. After the oven is naturally cooled to room temperature, the polymer film is taken out.

[0028] The polyimide 6FDA-MPDSALi prepared above was dissolved in NMP at room temperature to form a 10% (mass content) solution, and the solution was filter...

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Abstract

The invention provides a polyimide polymer. According to the invention, 2,2'-bis(3,4-dicarboxylphenyl)hexafluoropropane dianhydride (6FDA) used as a dianhydride monomer and 2,4-diaminobenzene sulfonate (MPDSAM) used as a diamine monomer, are subjected to solution copolycondensation so as to synthesize metal-ion-containing polyimide (6FDA-MPDSAM) which can be dissolved in N,N-dimethyl formamide (DMF), N,N-dimethyl acetamide (DMAc), N-methyl-2-pyrrolidone (NMP) and other solvents. The prepared polyimide has high gas permeability and selectivity and can be used for separation of a plurality of gases, e.g., separation of oxygen / nitrogen in the air, separation of hydrogen / nitrogen, separation of carbon dioxide and methane during purifying of natural gas, etc.

Description

technical field [0001] The invention relates to a polyimide polymer, in particular to a polyimide polymer which can be used to prepare gas separation membranes. Background technique [0002] The key to the membrane separation technology of gas mixture is the selection of membrane material. Since the climax of gas separation membrane research was set off in the 1970s, almost all existing polymer materials that can be formed into membranes have faced common problems in gas separation: membranes with good gas permeability have low selectivity; The same is true. However, the membrane materials required in the industry for separating gas mixtures should have high selectivity and high gas permeation rate at the same time, and it is also hoped that they can be easily processed into membranes. Aromatic polyimide has become a commercial membrane separation material because of its excellent heat resistance and solvent resistance. For gases to be separated, polyimide gas separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D53/22C08G73/10
CPCB01D53/228B01D71/64C08G73/1067Y02P20/151Y02C20/40
Inventor 王丽娜周美青刘丹丹曹义鸣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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