Preparation method of porous cross-linked anion exchange membrane for diffusion dialysis

An anion exchange membrane and diffusion dialysis technology, which is applied in the field of preparation of porous cross-linked anion exchange membranes, can solve the problems of poor diffusion dialysis performance, poor purity and unsatisfactory acid/salt separation factor of anion exchange membranes.

Inactive Publication Date: 2021-06-29
FUZHOU UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

But its acid/salt separation factor is still not ideal, which is mainly due to the lack of cross-linking degree
[0009] To sum up, as an effective technology for waste acid recovery, diffusion dialysis is limited by the technical bottleneck of poor diffusion dialysis performance of anion exchange membrane as the core component.
Due to the dense internal structure and small free space volume of tradi

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  • Preparation method of porous cross-linked anion exchange membrane for diffusion dialysis
  • Preparation method of porous cross-linked anion exchange membrane for diffusion dialysis

Examples

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Example Embodiment

[0038] Example 1

[0039] The degree of chloromethylation of chloromethosis was dissolved in N-methylpyrrolidone in N-methylpyrrolidone formed a concentration of 25 wt%, and the film was scraped on the glass plate with a doctor blade. 250 microns, the glass sheet was immersed in deionized water for phase conversion to obtain a chloromethyl polyether sulfone (CMPES) porous base film. The porous base film was immersed in a meta-concentration of 2 mol / L, a temperature of 60 ° C, and a porous crosslinking anion exchange membrane functionally functionally obtained by a temperature of 60 ° C. The ion exchange capacity of the film was measured (IEC, ie, the content of the quaternary ammonium group) was 1.28 mmol / g.

[0040] The CMPES porous base film and the porous crosslinked anion exchange membrane prepared in this example were analyzed. figure 2 Indicated. by figure 2 It can be seen that the high-resolution XPS spectrum of the N-region from the porous base film to the porous cross...

Example Embodiment

[0043] Example 2

[0044] A porous crosslinking anion exchange membrane is prepared using a method similar to Example 1, which is only changed to 48 h. The ion exchange capacity of the film was measured was 1.56 mmol / g. The porous crosslinked anion exchange film using the present embodiment is at 25 ° C at 25 ° C (concentration of 1.0 mol / L) / FeCl 2 (Concentration of 0.2 mol / L) mixed waste acid simulation solution for acid recovery, the acid dialysis coefficient of the film was 75.3 × 10 -3 M / H, acid / salt separation factor is 4368.2.

[0045] The ion exchange capacity of the porous crosslinked anion exchange membrane prepared in this example was increased by 32.2% (raised from 1.18 mmol / g from 1.56 mmol / g), and the acid dialyzing coefficient increased by 15.8%. 65.0 × 10 -3 M / H is increased to 75.3 × 10 -3 M / h), acid / salt separation factor increased by 142.7 times (raised from 30.4 to 4368.2), mainly due to the use of methaminiscin triamine. Compared to 2 tertia...

Example Embodiment

[0046] Example 3

[0047] A porous crosslinking anion exchange membrane is prepared using a method similar to Example 1, which is only 0.5 h, and the ion exchange capacity of the measuring film is 0.53 mmol / g. The porous crosslinked anion exchange film using the present embodiment is at 25 ° C at 25 ° C (concentration of 1.0 mol / L) / FeCl 2 The mixed waste acid simulation solution of (concentration of 0.2 mol / L) is acid recovery, and the acid dialysis coefficient of the film is 15.6 × 10 -3 M / H, acid / salt separation factor is 58.5.

[0048] Through the contrast of Examples 1-3, as the soaking time is increasing (0.5H increase to 48h), the ion exchange capacity of the porous crosslinked anion exchange membrane continues to increase (from 0.53 mmol / g to 1.56 mmol / g) , Simultaneous acid dialysis coefficient (from 15.6 × 10 -3 M / H is increased to 75.3 × 10 -3 M / H) and acid / salt separation factor (raised from 58.5 to 4368.2) continuously. This is because the degree ...

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Abstract

The invention discloses a preparation method of a porous cross-linked anion exchange membrane for diffusion dialysis, which comprises the following steps: dissolving chloromethylated polyethersulfone in an organic solvent to form a membrane casting solution, coating a substrate with the membrane casting solution, and performing a phase inversion method to obtain a porous base membrane; and soaking the porous base membrane in a pentamethyldiethylenetriamine solution to carry out synchronous crosslinking and quaternization modification so as to prepare the porous crosslinking anion exchange membrane suitable for diffusion dialysis. Based on the special microstructure of the porous membrane, especially the sufficient free space in the internal porous structure of the porous membrane, the ion transmission rate is greatly improved, and meanwhile, three tertiary amine groups contained in pentamethyldiethylenetriamine are used for achieving synchronous crosslinking and quaternization modification of the porous base membrane. Therefore, the porous cross-linked anion exchange membrane with both high acid dialysis coefficient and high acid/salt separation factor is prepared, and the use requirements of diffusion dialysis are met.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a preparation method of a porous cross-linked anion exchange membrane used for diffusion dialysis. Background technique [0002] Diffusion dialysis is currently recognized as the most economically promising waste acid recovery method. Anion exchange membrane is the core component of diffusion dialysis, and its performance directly determines the effect of diffusion dialysis acid recovery process, specifically, the acid dialysis coefficient of the membrane (U 酸 ) and acid / salt separation factor (S 酸 / 盐 ) respectively determine the speed and purity of the acid recovered in the diffusion dialysis process. So far, the performance of anion exchange membranes for diffusion dialysis is not ideal, mainly because of their poor acid dialysis coefficient and acid / salt separation factor. Taking the TWDD series of diffusion dialysis devices that have been widely commercialized...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D71/68B01D61/24C08J9/40C08L81/06
CPCB01D67/0009B01D67/0011B01D67/0093B01D69/02B01D69/10B01D71/68B01D61/243C08J9/40B01D2325/42C08J2381/06
Inventor 廖夏凤林小城唐丹妮史小可
Owner FUZHOU UNIVERSITY
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