Method for preparing monovalent selective cation exchange membrane through modification

A cation exchange membrane and selective technology, applied in the field of membrane separation, can solve the problems of long reaction time, poor stability of the modified layer, complicated equipment and operation, etc., and achieve easy large-scale production, good membrane selectivity, and simple operation process. Effect

Pending Publication Date: 2022-04-22
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods all have problems such as long reaction time, complicated equipment and operation, poor stability of the modified layer, etc., and are not suitable for large-scale application.

Method used

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  • Method for preparing monovalent selective cation exchange membrane through modification
  • Method for preparing monovalent selective cation exchange membrane through modification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Use Japanese Fuji Type 12 cation exchange membrane as the base membrane, first soak it in a ferric chloride solution with a concentration of 0.01mol / L, take it out after soaking for 0.5 hours, and wash the surface with deionized water to obtain iron-type cations exchange membrane.

[0019] 2) Prepare a Tris-HCl co-deposition buffer solution of dopamine and polyethyleneimine, wherein the concentration of Tris-HCl is 10mmol / L, the concentration of dopamine is 2g / L, and the concentration of polyethyleneimine with a molecular weight of 100000 is 4g / L. Soak the above-mentioned iron-type cation exchange membrane in the prepared coprecipitation buffer solution, place it in a shaker at room temperature for vibration deposition, and carry out surface deposition modification. After 0.5 hours, the membrane was taken out, and the surface was washed with deionized water to obtain a monovalent selective cation exchange membrane.

[0020] The scanning electron microscope of the pr...

Embodiment 2

[0023] The ferric chloride solution in the step 1 among the embodiment 1 is changed into the ferric nitrate solution of 1mol / L, and the oscillation deposition time in the shaking table is changed into 6 hours in the step 2, all the other materials used are consistent with the operating method, and obtained The monovalent selective cation exchange membrane described above.

[0024] After testing, the performance of the ion-exchange membrane prepared is as follows: the membrane resistance is increased by 6.0Ω·cm of the base membrane 2 Increased to 7.85Ω·cm 2 . NaCl and MgCl with a concentration of 0.1mol / L 2 The solution is a raw material solution, and a selectivity test is carried out in an electrodialysis device, and the selectivity coefficient of the prepared monovalent selective ion exchange membrane is 4.2.

Embodiment 3

[0026] The ferric chloride solution in the step 1 among the embodiment 1 is changed to the ferric sulfate solution of 0.1mol / L, the dopamine concentration in the step 2 co-deposition buffer is 10g / L, and using molecular weight is the polyethyleneimine of 10000, its The concentration is 10g / L, and the other materials used are consistent with the operating method to prepare the monovalent selective cation exchange membrane.

[0027] After testing, the performance of the ion-exchange membrane prepared is as follows: the membrane resistance is increased by 6.0Ω·cm of the base membrane 2 Increased to 7.42Ω·cm 2 . NaCl and MgCl with a concentration of 0.1mol / L 2 The solution is a raw material solution, and a selectivity test is carried out in an electrodialysis device, and the selectivity coefficient of the prepared monovalent selective ion exchange membrane is 4.5.

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Abstract

The invention discloses a method for preparing a monovalent selective cation exchange membrane through modification, which comprises the following steps: 1) soaking a cation exchange membrane in a solution containing Fe < 3 + > ions at room temperature, stirring and standing the solution, and cleaning the surface with water to obtain an iron type cation exchange membrane; and 2) preparing a codeposition buffer solution of dopamine and polyethyleneimine, soaking the iron-type cation exchange membrane prepared in the step 1) in the solution at room temperature to react for 0.5-6 hours, taking out the iron-type cation exchange membrane, and washing the surface with clear water to obtain the monovalent selective ion exchange membrane. According to the method, Fe < 3 + > ions combined in the ion exchange membrane in advance serve as an oxidizing agent to promote rapid polymerization of dopamine, the Fe < 3 + > ions and polyethyleneimine are co-deposited on the surface of the membrane to form a stable modified layer, the operation process is simple, the prepared membrane is good in selectivity, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a cation exchange membrane with single and multivalent ion selectivity. Background technique [0002] In recent years, electrodialysis technology has been widely used in the concentration treatment of saline wastewater, seawater desalination and desalination of process materials. Among them, the ion-exchange membrane is the core component of the electrodialysis device. The common anion-exchange membrane and cation-exchange membrane currently in commercial use have good selective permeability to anions and cations in the solution. If the ordinary ion exchange membrane can be made selective to different valence ions through chemical surface modification, it will greatly expand the application of electrodialysis technology in the fields of deep concentration of fouling brine, pickling wastewater treatment and other fields. [0003] The preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J47/12B01J39/16C02F1/469
CPCB01J47/12B01J39/16C02F1/4693
Inventor 郝亚超张成凯周立山靳晓霞李亮李亚宁付春明郝润秋肖彩英刘祺师晓光
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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