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Method for preparing high-performance carbon dioxide separation composite membrane containing twisted structure through interfacial polymerization

A technology of interfacial polymerization and twisted structure, applied in separation methods, chemical instruments and methods, semi-permeable membrane separation, etc., can solve problems such as unfavorable gas transmission, and achieve excellent selectivity, easy amplification, and improved selectivity.

Pending Publication Date: 2021-10-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of existing gas separation membranes prepared by interfacial polymerization is generally relatively dense, which is not conducive to the transfer of gas in the membrane.

Method used

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  • Method for preparing high-performance carbon dioxide separation composite membrane containing twisted structure through interfacial polymerization
  • Method for preparing high-performance carbon dioxide separation composite membrane containing twisted structure through interfacial polymerization
  • Method for preparing high-performance carbon dioxide separation composite membrane containing twisted structure through interfacial polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of separation layer solution: dissolve trimesoyl chloride in n-heptane and stir to form a uniform oil phase solution, the concentration of trimesoyl chloride solution is 0.01mol / L; N-methyldiethanolamine and 5, 5′,6,6′-Tetrahydroxy-3,3,3′,3′-Tetramethyl-spirobisindene was dissolved in deionized water, and sodium carbonate was added to stir to form an aqueous phase solution, N-methyldiethanolamine The concentration is 0.03mol / L, and the molar ratio of 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-spirobisindene to methyldiethanolamine is 0.05:1 , using sodium carbonate to adjust the pH of the solution to 10.5.

[0034] (2) Composite membrane preparation: fix the polysulfone ultrafiltration membrane coated with the middle layer on the plate frame, pour the oil phase solution, after the oil phase solution fully infiltrates the middle layer, pour out the oil phase and dry it, then pour water Phase solution, reacted at 40 °C for 10 minutes by interfacial poly...

Embodiment 2

[0037] (1) Preparation of separation layer solution: dissolve trimesoyl chloride in n-heptane and stir to form a uniform oil phase solution, the concentration of trimesoyl chloride solution is 0.015mol / L; N-methyldiethanolamine and 5, 5′,6,6′-Tetrahydroxy-3,3,3′,3′-Tetramethyl-spirobisindene was dissolved in deionized water, and sodium carbonate was added to stir to form an aqueous phase solution, N-methyldiethanolamine The concentration is 0.06mol / L, and the molar ratio of 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-spirobisindene to N-methyldiethanolamine is 0.05 : 1, using sodium carbonate to adjust the pH of the solution to be 10.

[0038] (2) Composite membrane preparation: fix the polyacrylonitrile ultrafiltration membrane coated with the middle layer on the plate frame, pour the oil phase solution, the oil phase solution fully infiltrates the middle layer, pour out the oil phase and dry it, and then pour it into The aqueous phase solution was reacted at 40 °C for 15 m...

Embodiment 3

[0041] (1) Preparation of separation layer solution: dissolve trimesoyl chloride in n-heptane and stir to form a uniform oil phase solution, the concentration of trimesoyl chloride solution is 0.015mol / L; N-methyldiethanolamine and 5, 5′,6,6′-Tetrahydroxy-3,3,3′,3′-Tetramethyl-spirobisindene was dissolved in deionized water, and sodium carbonate was added to stir to form an aqueous phase solution, N-methyldiethanolamine The concentration is 0.12mol / L, and the molar ratio of 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-spirobisindene to N-methyldiethanolamine is 0.5 : 1, using sodium carbonate to adjust the pH of the solution to be 10.5.

[0042] (2) Composite membrane preparation: Fix the polyethersulfone ultrafiltration membrane coated with the middle layer on the plate frame, pour the oil phase solution, the oil phase solution fully infiltrates the middle layer, pour out the oil phase and dry it, and then pour it into The aqueous phase solution was reacted at 30 °C for 3 mi...

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Abstract

The invention relates to a method for preparing a high-performance carbon dioxide separation composite membrane containing a twisted structure through interfacial polymerization. The method comprises the following steps: dissolving trimesoyl chloride in an organic phase solvent n-heptane, and stirring to form a uniform oil phase solution; dissolving N-methyldiethanolamine and 5, 5 ', 6, 6'-tetrahydroxy-3, 3, 3 ', 3'-tetramethyl-helical bisindene in deionized water, uniformly stirring to form a solution, adding sodium carbonate to adjust the pH value of the solution to 10-11, and stirring to form a water phase solution; fixing the ultrafiltration membrane coated with the middle layer on a plate frame, pouring an oil phase solution, pouring out an oil phase after the oil phase solution fully infiltrates the middle layer, airing, and then pouring the water phase solution for interfacial polymerization reaction; finally, pouring out the water phase solution and washing with deionized water; and putting into a constant-temperature and constant-humidity box, and drying to obtain the composite membrane. The CO2 permeation rate of the composite membrane is 250-480 GPU, and the CO2 / N2 separation factor is 55-77.

Description

technical field [0001] The invention relates to a kind of monomer with twisted unit added to the oil phase or water phase and polymerized at the interface to prepare a 2 Selectivity and high CO 2 The method of permeation rate composite membrane belongs to the field of gas separation membrane preparation; by adjusting the rigidity of the polymer skeleton segment, optimizing the monomer concentration and reaction temperature, high-performance CO 2 Separate the composite membrane. Background technique [0002] With the rapid development of industry, CO 2 The emission of carbon dioxide is increasing year by year, and the greenhouse effect is intensified, leading to global climate anomalies and frequent natural disasters, which seriously damage the earth's ecosystem and have a serious impact on human survival and sustainable development. [1] . to CO 2 Capture and storage (CCS) is the current control and reduction of CO 2 effective means of emission. Commonly used CO 2 Sep...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D53/22
CPCB01D67/0006B01D69/125B01D53/228Y02C20/40
Inventor 王志马翠花李庆华王纪孝
Owner TIANJIN UNIV
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