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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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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 traditional dense anion exchange membranes, the ion transmission rate in the membrane is low, and the acid dialysis coefficient of anion exchange membranes cannot be fundamentally improved.
Although the existing porous anion exchange membrane can effectively improve the acid dialysis coefficient of the membrane, its acid / salt separation performance is poor, resulting in poor purity of the recovered acid

Method used

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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

Experimental program
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Embodiment 1

[0039] Dissolve chloromethylated polyethersulfone (CMPES) with a chloromethylation degree of 60% in N-methylpyrrolidone to form a casting solution with a concentration of 25wt%, scrape the film on a glass plate with a scraper, and control the thickness of 250 microns, and then immerse the glass plate in deionized water for phase inversion to obtain a chloromethyl polyethersulfone (CMPES) porous base membrane. The porous base membrane was immersed in an aqueous solution of pentamethyldiethylenetriamine with a concentration of 2 mol / L and a temperature of 60° C. for 12 hours to obtain a porous cross-linked anion exchange membrane functionalized with pentamethyldiethylenetriamine. The ion exchange capacity (IEC, ie the content of quaternary ammonium groups) of the membrane was measured to be 1.28 mmol / g.

[0040] Carry out X-ray photoelectron spectroscopy (XPS) analysis to the CMPES porous base membrane and porous cross-linked anion exchange membrane prepared in this embodiment, ...

Embodiment 2

[0044] A porous cross-linked anion exchange membrane was prepared by a method similar to that of Example 1, except that the soaking time was changed to 48 hours. The ion exchange capacity of the membrane was measured to be 1.56 mmol / g. Using the porous cross-linked anion exchange membrane of this example, HCl (concentration: 1.0 mol / L) / FeCl 2 (concentration of 0.2 mol / L) mixed waste acid simulated solution for acid recovery, the measured acid dialysis coefficient of the membrane is 75.3×10 -3 m / h, the acid / salt separation factor is 4368.2.

[0045] Compared with Comparative Example 2, the ion exchange capacity of the porous cross-linked anion exchange membrane prepared in this example increased by 32.2% (from 1.18mmol / g to 1.56mmol / g), and the acid dialysis coefficient increased by 15.8% (from 65.0×10 -3 m / h increased to 75.3×10 -3 m / h), the acid / salt separation factor increased by a factor of 142.7 (from 30.4 to 4368.2), which was mainly attributed to the use of pentame...

Embodiment 3

[0047] A porous cross-linked anion exchange membrane was prepared by a method similar to that of Example 1, except that the soaking time was changed to 0.5 h, and the ion exchange capacity of the membrane was measured to be 0.53 mmol / g. Using the porous cross-linked anion exchange membrane of this example, HCl (concentration: 1.0 mol / L) / FeCl 2 (concentration of 0.2 mol / L) mixed waste acid simulated solution for acid recovery, the measured acid dialysis coefficient of the membrane is 15.6×10 -3 m / h, the acid / salt separation factor is 58.5.

[0048] Through the comparison of Examples 1-3, it can be seen that with the continuous increase of soaking time (0.5h to 48h), the ion exchange capacity of the porous cross-linked anion exchange membrane is continuously increased (from 0.53mmol / g to 1.56mmol / g) , while the acid dialysis coefficient of the membrane (from 15.6×10 -3 m / h increased to 75.3×10 -3 m / h) and the acid / salt separation factor (from 58.5 to 4368.2) were continuou...

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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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