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Hexatomic ring polyimide copolymer separation membrane as well as preparation method and application of hexatomic ring polyimide copolymer separation membrane

A six-membered ring polyimide copolymer and separation membrane technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc. and other problems, to achieve the effect of remarkable separation effect, high gas permeability coefficient and simple process

Active Publication Date: 2018-05-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the currently disclosed polyimide polymers cannot take into account gas selectivity and permeability well as gas separation membrane materials, and there is no related structure and gas properties of non-sulfonated six-membered ring polyimide membranes. The permeation relationship is reported, and the influence of its structure on the gas separation performance is not clear

Method used

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  • Hexatomic ring polyimide copolymer separation membrane as well as preparation method and application of hexatomic ring polyimide copolymer separation membrane
  • Hexatomic ring polyimide copolymer separation membrane as well as preparation method and application of hexatomic ring polyimide copolymer separation membrane
  • Hexatomic ring polyimide copolymer separation membrane as well as preparation method and application of hexatomic ring polyimide copolymer separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1, the preparation of six-membered ring polyimide copolymer NTDA-TrMPD / BTFBz (1 / 1) separation membrane

[0060] Add 0.9617g (3.0mmol) 2,2'-bis(trifluoromethyl)benzidine (BTFBz) and 0.4507g (3.0mmol) 2,4,6-trimethyl-m-benzene to a 100mL dry three-necked flask Diamine (TrMPD) and 20 mL m-cresol, the reaction mixture was magnetically stirred under nitrogen flow at room temperature. After BTFBz and TrMPD were completely dissolved, 1.6091 g (6.0 mmol) of NTDA and 1.465 g (12.0 mmol) of benzoic acid were added, and the mixture was heated at 80° C. for 4 hours, and then at 180° C. for 10 hours. After cooling to room temperature, 1.55 g (12 mmol) of isoquinoline were added in one portion, and the reaction mixture was heated at 180° C. for another 10 hours. After cooling to about 120°C, the highly viscous dark brown polyimide solution was diluted with 10 mL of m-cresol and then poured into methanol. The resulting precipitate was collected by filtration, thoroughly w...

Embodiment 2

[0065] Embodiment 2, the preparation of six-membered ring polyimide copolymer NTDA-TrMPD / BTFBz (1 / 2) separation membrane

[0066] Control the molar ratio of TrMPD to BTFBz to be 1:2, a total of 6 mol, and the rest of the operation steps and conditions are similar to those in Example 1 to prepare a six-membered ring polyimide copolymer NTDA-TrMPD with a unit ratio of TrMPD to BTFBz of 1:2 / BTFBz(1 / 2) separation membrane.

[0067] The above-mentioned six-membered ring polyimide copolymer NTDA-TrMPD / BTFBz (1 / 2) separation membrane was dissolved in NMP with a content of 0.5 wt % to detect the intrinsic viscosity, and the measured intrinsic viscosity was 2.42 dL / g.

Embodiment 3

[0068] Embodiment 3, the preparation of six-membered ring polyimide copolymer NTDA-TrMPD / BTFBz (1 / 3) separation membrane

[0069] Control the molar ratio of TrMPD to BTFBz to be 1:3, a total of 6 mol, and the rest of the operating steps and conditions are similar to those in Example 1, to prepare a six-membered ring polyimide copolymer NTDA-TrMPD with a unit ratio of TrMPD to BTFBz of 1:3 / BTFBz (1 / 3) separation membrane.

[0070] The above-mentioned six-membered ring polyimide copolymer NTDA-TrMPD / BTFBz (1 / 3) separation membrane was dissolved in NMP with a content of 0.5 wt % to detect the intrinsic viscosity, and the measured intrinsic viscosity was 2.13 dL / g.

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Abstract

The invention discloses a hexatomic ring polyimide copolymer separation membrane which comprises a copolymer structure as shown by a formula I. The invention further discloses a preparation method andapplication of the hexatomic ring polyimide copolymer separation membrane. A hexatomic ring type polyimide membrane prepared by the invention has good heat stability, relatively high storage modulus,a relatively large free volume, a good gas permeation coefficient and good selectivity, and is particularly suitable for separation of systems such as CO2 / CH4, CO2 / N2 and O2 / N2.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a six-membered ring polyimide copolymer separation membrane, its preparation method and application. Background technique [0002] Membrane separation technology uses selectively permeable membranes as the separation medium. By applying a certain driving force (such as pressure difference, concentration difference, potential difference, etc.) on both sides of the membrane, the components on the raw material side are selectively permeated through the membrane. So as to achieve the purpose of separation, purification and concentration. Compared with traditional adsorption refrigeration and condensation separation, gas membrane separation technology has the advantages of energy saving, high efficiency, simple operation, no phase change, and operation at room temperature. The preparation and selection of membrane materials is the core part of membrane separation tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/64C08G73/10B01D53/22
CPCB01D53/228B01D67/0013B01D71/64C08G73/1039C08G73/1067
Inventor 房建华钱凯童晶晶刘蕊郭玉飞郭晓霞
Owner SHANGHAI JIAO TONG UNIV
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