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Chemically crosslinked carboxyl-containing polyimide hydrogen separation membrane and preparation method thereof

A polyimide and chemical cross-linking technology, applied in the field of membrane separation, can solve the problems such as the lack of large-scale application in the chemical field, the lack of hydrogen separation, and the lack of hydrogen permeable membranes, and achieves easy preparation, increased gas selectivity, and improved separation. performance effect

Pending Publication Date: 2021-11-02
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies on the use of membrane separation technology for hydrogen separation. At the same time, due to the lack of high-performance hydrogen permeable membranes on the market, this technology has not yet been widely used in the chemical industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A glycidyl ether cross-linked polyimide hydrogen separation membrane with carboxyl groups. The copolymerized polyimide is prepared by polycondensation reaction and chemical imidization reaction from dianhydride and diamine at a molar ratio of 1:1. , which is prepared from 4,4'-(hexafluoroisopropylene) diphthalic anhydride, m-phenylenediamine and 3,5-diaminobenzoic acid, and then chemically cross-links polyimide through glycidyl ether, so that Its cross-linking has carboxyl groups, which improves the permeability and selectivity of the membrane to hydrogen.

[0024] A kind of preparation of glycidyl ether cross-linked polyimide hydrogen separation membrane with carboxyl group, specifically as follows: Step 1, preparation of polyimide: place 4,4'-(hexafluoroisopropylene) diphthalic anhydride in Treat in a sublimation furnace at 130°C for 12 hours, place m-phenylenediamine and 3,5-diaminobenzoic acid in a vacuum drying oven at 50°C for 12 hours in vacuum; weigh 1.530g m-ph...

Embodiment 2

[0029] A glycidyl ether cross-linked polyimide hydrogen separation membrane with carboxyl groups, the copolymerized polyimide is prepared from dianhydride and diamine at a molar ratio of 1:1, through polycondensation reaction and chemical imidization reaction , in which 4,4'-(hexafluoroisopropylene) diphthalic anhydride, m-phenylenediamine and 3,5-diaminobenzoic acid are selected, and polyimide is chemically cross-linked through glycidyl ether to make it cross-linked With carboxyl groups, it can improve the permeability and selectivity of the membrane to hydrogen.

[0030]A kind of preparation of glycidyl ether cross-linked polyimide hydrogen separation membrane with carboxyl group, specifically as follows: Step 1, preparation of polyimide: place 4,4'-(hexafluoroisopropylene) diphthalic anhydride in Treat in a sublimation furnace at 130°C for 12 hours, place m-phenylenediamine and 3,5-diaminobenzoic acid in a vacuum drying oven at 50°C for 12 hours in vacuum; weigh 3.06g m-phe...

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Abstract

The invention provides a chemically crosslinked carboxyl-containing polyimide hydrogen separation membrane and a preparation method thereof. A copolyimide is prepared from dianhydride and diamine according to the molar ratio of 1: 1 through condensation polymerization and chemical imidization reaction, and respectively selects dianhydride A, rigid diamine and carboxyl-containing diamine C. Chemical crosslinking is performed on polyimide through glycidyl ether, so that the polyimide is crosslinked with carboxyl (chemically crosslinked polyimide with carboxyl: Polyimide, hereinafter referred to as PI molecular chain), and the permeability and selectivity of the membrane to hydrogen can be improved. The chemically crosslinked polyimide membrane material is easy to prepare, and the synthesized polyimide is large in free volume and has good air permeability and selectivity; and by using diamine containing carboxyl, polyimide can be crosslinked, the molecular free volume can be increased while the molecular chain movement ability can be reduced, and the gas selectivity can be increased.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a chemically cross-linked polyimide hydrogen separation membrane with carboxyl groups and a preparation method thereof. Background technique [0002] Hydrogen is an important raw material for hydrogenation processes such as hydrofining and hydrocracking. With the multiple pressures of worsening crude oil quality, increasingly stringent environmental protection requirements and the improvement of corresponding product quality, hydrogenation process has been widely used. The continuous transformation and expansion of hydrogen plants has led to an increasing demand for hydrogen. Choosing cheap or low-cost methods to obtain hydrogen can become a necessary means to improve competitiveness. Reasonable planning and utilization of hydrogen resources are necessary for modern refineries to improve competitiveness means. During the processing, a large amount of hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D67/00B01D53/22
CPCB01D71/64B01D67/0016B01D53/228B01D2256/16
Inventor 高成云吉学智温艳珍智翠梅王二兵张燕张跃忠
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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