Monovalent selective cation exchange membrane and preparation method thereof

A cation exchange membrane and selective technology, applied in the field of membrane separation, can solve the problems of low selectivity and stability of monovalent ion selective membrane, and achieve the effects of good electrical conductivity, simple preparation method and high monovalent ion selectivity

Inactive Publication Date: 2020-12-22
宜兴喜瑞洲企业管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the selectivity and stability of monovalent ion-selective membranes are not yet high, so there is an urgent need to develop high-performance monovalent-selective ion-exchange membranes.

Method used

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  • Monovalent selective cation exchange membrane and preparation method thereof
  • Monovalent selective cation exchange membrane and preparation method thereof
  • Monovalent selective cation exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of a monovalent selective cation exchange membrane, the specific steps are as follows:

[0040]Step 1, preparation of carboxyl mesoporous polymer: carboxyl mesoporous polymer is an aqueous solution of polymer precursor hydroxybenzoic acid, hexamethylenetetramine, nonionic surfactant F127 and ethylenediamine, wherein hydroxybenzoic acid The concentration of F127 is 2-5wt.%, the concentration of hexamethylenetetramine is 0.5-1.5wt.%, the concentration of F127 is 3-5wt.%, the concentration of ethylenediamine is 0.5-1.5wt.%. Preparation method, reaction temperature is 100-150°C, reaction time is 3-10 hours, washed with ethanol and water and suction-filtered, dried overnight at 50-80°C in vacuum, and then calcined at 350°C for 5-8 hours in an Ar gas atmosphere. The heating and cooling rate of calcination is 1-2°C / min. Transmission electron micrographs of carboxyl mesoporous polymers as image 3 shown;

[0041] Step 2, preparation of the basement membr...

Embodiment 2

[0046] A preparation method of a monovalent selective cation exchange membrane, the specific steps are as follows:

[0047] Step 1, preparation of sulfonic acid-based mesoporous polymer: sulfonic acid-based mesoporous polymer is based on polymer precursor (aqueous solution of hydroxybenzenesulfonic acid) and nonionic surfactant (hexamethylenetetramine and F127) aqueous solution), wherein the concentration of hydroxybenzenesulfonic acid is 0.5-2wt.%, the concentration of hexamethylenetetramine is 0.5-1.5wt.%, and the concentration of F127 is 0.5-1.5wt.%. It is prepared by oil bath reaction, The reaction temperature is 60-120°C, the reaction time is 16-32 hours, washed with ethanol and water and suction-filtered, dried overnight at 50-80°C in vacuum, and then calcined at 300-350°C for 5-8 hours in an Ar gas atmosphere. The heating rate of the calcination is 1-3° C. / min. The transmission electron micrographs of sulfonic acid-based mesoporous polymers are as follows: Figure 4 s...

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Abstract

The invention provides a monovalent selective cation exchange membrane and a preparation method thereof. The preparation method is characterized by comprising the following steps: (1), dissolving oneor more of sulfonated polysulfone, sulfonated polyvinylidene fluoride and sulfonated polyether-ether-ketone in an organic solvent to obtain a membrane casting solution to prepare a base membrane; (2),preparing a functionalized mesoporous polymer by using a self-assembly method, and dispersing the functionalized mesoporous polymer into an aqueous solution of an amine compound with carboxyl and sulfonic acid groups; and (3) carrying out interfacial polymerization to obtain the monovalent cation selective ion exchange membrane. The prepared membrane is low in resistance, high in limiting currentdensity, high in monovalent / multivalent ion selectivity and simple in preparation method, can be used for separation of monovalent cations and multivalent cations, and is typically applied to concentrated seawater recycling and industrial wastewater zero discharge such as separation of NaCl / MgCl2 and Na2SO4 / MgSO4.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a monovalent selective cation exchange membrane and a preparation method thereof. Background technique [0002] Electrodialysis utilizes the selective permeability of ion exchange membranes to ions. Driven by an external DC electric field, anions and cations pass through anion and cation exchange membranes to different chambers under the action of an electric field, thereby realizing the separation, purification and concentration of electrolyte solutions. Wait. Since the electrodialysis process is operated under normal pressure, the membrane fouling is small, and the electrolyte solution can be concentrated to a higher concentration, so electrodialysis has a wide range of applications in brackish water treatment, seawater desalination, chemical production and high-salt wastewater treatment. application. [0003] In recent years, as environmental protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/52B01D71/34B01D69/02B01D67/00B01D61/48
CPCB01D71/68B01D71/34B01D71/52B01D69/02B01D67/0011B01D61/485B01D2325/42
Inventor 张杨毛德彬王子周达马肖张琪谈永军邵震郭亚群
Owner 宜兴喜瑞洲企业管理有限公司
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