Diffusion and dialysis membrane for alkali recovery as well as preparation method and application of same

A technology of diffusion dialysis and dialysis, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of membrane lack of covalent bond crosslinking, consumption of organic solvents, cumbersome preparation steps, etc., and achieve compatibility Good, simple method, strong cross-linking effect

Active Publication Date: 2013-02-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned defects of the prior art, such as lack of covalent bond cross-linking in the membrane, insufficient stability of the membrane, cumbersome preparation steps, consumption of a large amount of organic solvent, large pollution, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] (2) Preparation of membrane solution:

[0041] Add alkoxysilane to the PVA solution prepared in step (1) in proportion, after magnetic stirring, then add a certain proportion of ion-exchange group silanol and catalyst, after heating up to 60-80°C, continue stirring to obtain a uniform film liquid;

[0042]Preferably, preferably, in step (2), the mass ratio of polyvinyl alcohol to alkoxysilane and silanol is: 1:0.1-0.5:0.1-1. The higher the ratio of polyvinyl alcohol to alkoxysilane and silanol, the higher the alkali dialysis rate, but the lower the selectivity, and vice versa, the lower the alkali dialysis rate, but the higher the selectivity. The mass ratio of the silanol to catalyst ratio is: 1:0.01-0.1.

[0043] Preferably, the time for magnetic stirring is 1-4h, and the time for stirring after heating is 12-36h.

[0044] Preferably, the catalyst is ammonia water, sodium formate, sodium acetate, sodium hydroxide or potassium hydroxide.

[0045] (3) Heat treatment...

Embodiment 1

[0051] 1. Dissolution of PVA: Take 42.4g of PVA raw material, soak in 760mL water for one day, under stirring condition, then heat up to about 102°C with a heating rate of 8°C / h, and keep it at 102°C for 2.5 hours ( h), to obtain a uniform transparent solution, cooled to about 60 ° C for subsequent use, the mass concentration of the solution is 5%;

[0052] 2. Preparation of membrane solution: take 20ml of the above-prepared PVA (1g) solution, add 0.1g tetraethyl orthosilicate, stir magnetically for 1 hour, then add 0.1g of 3-(trihydroxysilyl)-propanesulfonic acid, Then add 0.005g of sodium hydroxide, raise the temperature to 60°C, and continue stirring for 24 hours to obtain a uniform film solution;

[0053] 3. Heat treatment to form a film: apply the obtained coating solution on a glass plate, and ventilate and dry it for 2 days at room temperature, so that the coating solution forms a uniform and stable gel layer on the glass plate, that is, a membrane, from the glass plate...

Embodiment 2

[0067] Using the same preparation process as in Example 1, the amount of 3-(trihydroxysilyl)-propanesulfonic acid was changed to 0.2 g to obtain a film with a similar structure.

[0068] The cation exchange membrane that present embodiment is made is tested, and the result shows:

[0069] The water content of the film is 60.8%; the IEC is 0.72mmol / g;

[0070] Mechanical strength test: the elongation at break of the film is 571%, and the tensile strength is 19.7MPa;

[0071] Thermal analysis test: The short-term thermal stability of the film in the air atmosphere is as high as 228°C;

[0072] Diffusion dialysis test: At room temperature (25°C), the dialysis coefficient of alkali is 0.0220m / h, and the separation factor is 11.6, indicating that the membrane can be used in the field of alkali recovery.

[0073] Based on the above test results, it can be seen that the organic-inorganic hybrid cation exchange membrane obtained in this example has high mechanical strength and can b...

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Abstract

The invention discloses an organic-inorganic hybrid cation exchange membrane for alkali recovery in manners of diffusion and dialysis as well as a preparation method and an application of the membrane. The diffusion and dialysis membrane consists of an organic phase and an inorganic phase, wherein the organic phase is polyvinyl alcohol (PVA); the inorganic phase is a mixture of silanol and alkoxy silane; and the cation exchange membrane has a moisture content of 38-105 percent, an ion exchange capacity of 0.30-2.10 mmol/g, an alkali dialysis coefficient of 0.010-0.025 m/h and a separation factor of 11.3-33.5. The organic-inorganic hybrid cation exchange membrane as well as the preparation method and the application of the membrane has the beneficial effects that the silanol containing an ion exchange group is directly introduced, the ion exchange capacity is obtained, therefore, the reaction process is simple and controllable; as the whole reaction process is carried out in a water phase, and no organic solvent is required, the reaction process is green and environmentally-friendly; and the obtained hybrid cation exchange membrane has high mechanical strength and high thermal stability and can be applied to the field of alkali recovery.

Description

technical field [0001] The invention belongs to the field of membrane technology, and specifically relates to the preparation of an organic-inorganic hybrid cation exchange membrane for alkali recovery by diffusion dialysis through a sol-gel method, a preparation method and application thereof. Background technique [0002] Alkali-containing wastewater widely exists in various industrial processes such as papermaking, printing, tungsten, and aluminum smelting. The traditional treatment process generally has the disadvantages of high acid consumption and energy consumption. Diffusion dialysis is a membrane separation process based on the concentration difference as the driving force. It has a simple process and low energy consumption, and has been widely used in industry. At present, commercial diffusion dialysis for recovery of alkali is relatively scarce, which restricts the application of diffusion dialysis in alkali recovery. [0003] "Journal of Membrane Science" (Jour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00
Inventor 徐铜文郝建文
Owner UNIV OF SCI & TECH OF CHINA
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