Method for preparing gas separation composite membrane through interfacial polymerization by adding carboxymethyl chitosan

A technology of carboxymethyl chitosan and interfacial polymerization, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problem that the separation performance of the film is difficult to maintain, achieve carrier mobility and activity enhancement, and enhance the carrier The effect of content and mobility enhancement

Active Publication Date: 2021-08-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When many water-swellable materials are used to prepare facilitated transport membranes, it is difficult to maintain separation performance when preparing thin films[7,8]

Method used

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  • Method for preparing gas separation composite membrane through interfacial polymerization by adding carboxymethyl chitosan
  • Method for preparing gas separation composite membrane through interfacial polymerization by adding carboxymethyl chitosan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Configure an aqueous phase solution containing 0.06% piperazine and 0.05% carboxymethyl chitosan, fully stir for 15 minutes to dissolve, then let stand for 5 minutes for subsequent use;

[0027] (2) Configure a hexane solution containing 0.08% trimesoyl chloride, use the configured hexane solution to fully infiltrate the polyethersulfone support membrane for 5 minutes, then pour off the hexane solution;

[0028] (3) Then the aqueous phase solution is poured on the support membrane after soaking, and an ultrathin polymer separation layer is formed by interfacial polymerization;

[0029] (4) Rinse the reacted membrane surface 3 times with a large amount of deionized water to remove excess unreacted monomer;

[0030] (5) Put the prepared composite membrane into a constant temperature and humidity box at 30° C. and 30% relative humidity for dry storage to obtain a gas separation composite membrane containing swellable carboxymethyl chitosan. The electron microscope pict...

Embodiment 2

[0033] (1) Configure an aqueous phase solution containing 0.10% piperazine and 0.10% carboxymethyl chitosan, fully stir for 20 minutes to dissolve, and then let it stand for 8 minutes for subsequent use;

[0034] (2) configure a hexane solution containing 0.10% trimesoyl chloride, use the configured hexane solution to fully infiltrate the polysulfone support membrane for 8 minutes, then pour off the hexane solution;

[0035] (3) Then the aqueous phase solution is poured on the support membrane after soaking, and an ultrathin polymer separation layer is formed by interfacial polymerization;

[0036] (4) Rinse the reacted membrane surface 4 times with a large amount of deionized water to remove excess unreacted monomer;

[0037] (5) The composite membrane prepared is put into 35 ℃ and 40% relative humidity in the constant temperature and humidity chamber dry preservation, obtains the gas separation composite membrane that contains swelling carboxymethyl chitosan, electron micros...

Embodiment 3

[0040] (1) Configure an aqueous phase solution containing 0.12% piperazine and 0.20% carboxymethyl chitosan, fully stir for 25 minutes to dissolve, then let stand for 10 minutes for subsequent use;

[0041] (2) Configure a hexane solution containing 0.12% trimesoyl chloride, use the configured hexane solution to fully infiltrate the polyacrylonitrile support membrane for 10 minutes, then pour off the hexane solution;

[0042](3) Then the aqueous phase solution is poured on the support membrane after soaking, and an ultrathin polymer separation layer is formed by interfacial polymerization;

[0043] (4) Rinse the reacted membrane surface 5 times with a large amount of deionized water to remove excess unreacted monomer;

[0044] (5) Put the prepared composite membrane into a constant temperature and humidity box at 40° C. and 50% relative humidity for dry storage to obtain a gas separation composite membrane containing swellable carboxymethyl chitosan. The electron microscope pi...

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Abstract

The invention relates to a method for preparing a gas separation composite membrane through interfacial polymerization by adding carboxymethyl chitosan. The method comprises the steps: preparing a water phase solution containing piperazine and carboxymethyl chitosan, fully stirring and dissolving, and standing for later use; preparing a hexane solution containing trimesoyl chloride, fully infiltrating the support membrane by using the prepared hexane solution, and pouring out the hexane solution; pouring the aqueous phase solution on the infiltrated support membrane, and forming an ultrathin polymer separation layer through interfacial polymerization reaction; washing the reacted membrane surface with a large amount of deionized water, and removing redundant unreacted monomers; and putting the prepared composite membrane into a constant-temperature and constant-humidity box for drying and storing to obtain the gas separation composite membrane containing the swelling carboxymethyl chitosan. The preparation process of the composite membrane is simple, easy to operate, short in interface reaction time and low in cost. Meanwhile, the excellent selectivity higher than 80 is obtained. The method is not only suitable for preparing the gas separation composite membrane, but also suitable for preparing other high-performance interfacial polymerization separation membranes.

Description

technical field [0001] The invention prepares a gas separation membrane by interfacial polymerization of carboxymethyl chitosan in the water phase; utilizes the hydrogen bond interaction between the water-swellable carboxymethyl chitosan and the water phase monomer to regulate the reaction diffusion process to prepare high-performance gas separation A membrane belongs to the field of composite membrane preparation. Background technique [0002] With the continuous advancement of the industrialization process, fossil energy such as petroleum and coal has been used in large quantities, resulting in environmental problems that cannot be ignored. Combustion of fossil fuels produces a large amount of CO 2 Emissions into the atmosphere have had adverse effects on global climate change and ecological environment change. In recent years, many researches at home and abroad have focused on CO 2 Technology development for emission reduction. CO 2 Separation membrane technology has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/08B01D53/22
CPCB01D69/125B01D69/122B01D67/0002B01D71/08B01D53/228Y02C20/40
Inventor 王志李楠王纪孝
Owner TIANJIN UNIV
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