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Cross-linked hollow fiber anion exchange membrane and preparation method thereof

An anion-exchange membrane and hollow technology, applied in the field of cross-linked hollow fiber anion-exchange membrane and its preparation, can solve the problems of complex process and high price, achieve high effective area, stable performance, and improve the effect of dialysis coefficient

Active Publication Date: 2016-12-14
林小城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology for preparing hollow fiber anion exchange membranes has the disadvantages of complicated process and high price. Therefore, a simple and economical method is sought to prepare high-performance hollow fiber porous membranes and realize their application in acid recovery diffusion dialyzers. application seems urgent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve chloromethylated polysulfone in N-methylpyrrolidone to form a casting solution with a mass fraction of 10wt%, and dry-wet spinning to obtain a hollow fiber base membrane with an inner diameter of 0.2mm and a wall thickness of 0.05mm , soak the base film in a 2mol / L aqueous solution of N,N,N',N'-tetramethylethylenediamine, and control the temperature at 15 o C, the immersion time is 1h, and the cross-linked hollow fiber anion exchange membrane is obtained.

[0030] The static diffusion dialysis performance test of the crosslinked hollow fiber anion exchange membrane prepared above showed that the acid dialysis coefficient of the membrane was 0.015 m / h and the selectivity factor was 11.0.

Embodiment 2

[0032] Dissolve chloromethylated polyethersulfone in N,N-dimethylformamide to form a casting solution with a mass fraction of 10wt%, and dry-wet spinning to obtain an inner diameter of 0.2mm and a wall thickness of 0.05mm The hollow fiber base membrane is soaked in the ethanol solution of 5mol / L N,N,N',N'-tetramethyl-1,3-propanediamine, and the temperature is controlled at 100 o C, the immersion time is 4h, and the cross-linked hollow fiber anion exchange membrane is obtained.

[0033] The static diffusion dialysis performance test of the crosslinked hollow fiber anion exchange membrane prepared above showed that the acid dialysis coefficient of the membrane was 0.045 m / h and the selectivity factor was 15.7.

Embodiment 3

[0035] Dissolve chloromethylated naphthalene biphenyl polyethersulfone in N,N-dimethylacetamide to form a casting solution with a mass fraction of 10wt%, and obtain an inner diameter of 0.2mm by dry-wet spinning. A hollow fiber base membrane with a thickness of 0.05 mm is soaked in a 0.1 mol / L methanol solution of N,N,N',N'-tetramethyl-1,4-butanediamine, and the temperature is controlled at 50 o C, the immersion time is 24h, and the cross-linked hollow fiber anion exchange membrane is obtained.

[0036] The static diffusion dialysis performance test of the crosslinked hollow fiber anion exchange membrane prepared above showed that the acid dialysis coefficient of the membrane was 0.023 m / h and the selectivity factor was 15.7.

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Abstract

The invention discloses a cross-linked hollow fiber anion exchange membrane and a preparation method thereof. The preparation method is characterized by comprising the steps that an aromatic polymer subjected to halomethylation is dissolved in an organic solvent, and a membrane casting solution is formed; the membrane casting solution is subjected to dry-wet spinning, a hollow fiber basement membrane is obtained, cross-linking and positively charged modification are conducted on the hollow fiber basement membrane through a one-step or two-step method, and the cross-linked hollow fiber anion exchange membrane is obtained finally. According to the cross-linked hollow fiber anion exchange membrane and the preparation method thereof, the basement membrane and a modified functional agent which are high in activity are selected, and by means of a nucleophilic substitution reaction between the basement membrane and the modified functional agent, functional modification to the basement membrane can be achieved under a very mild condition. The method has the advantages of being simple in process and low in cost, and meanwhile the prepared membrane has a good diffusion permeability property and has a large-scale application prospect in the field of acid recovery.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a cross-linked hollow fiber anion exchange membrane for acid recovery and a preparation method thereof. Background technique [0002] In industrial production processes, such as hydrometallurgy and pickling processes, it is necessary to use a variety of inorganic acids to clean or dissolve samples. Since the acid is added in excess, large quantities of spent acid solutions containing metal salts are produced in these processes. The direct discharge of these waste acid solutions will cause serious environmental pollution and waste of resources. Therefore, it is necessary to find an effective method to recycle the acid in the waste liquid to avoid the resulting pollution and waste. Traditional waste acid treatment methods include neutralization, crystallization, thermal decomposition and solvent extraction, but these methods usually require high energy consumption, and it is dif...

Claims

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Application Information

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IPC IPC(8): B01D61/24B01D69/08B01D69/02B01D67/00B01J41/12
CPCB01D61/243B01D67/0002B01D69/02B01D69/08B01D2323/30B01D2325/42B01J41/12
Inventor 林小城
Owner 林小城
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