Diffusion dialysis membrane for recycling acid, as well as preparation method and application thereof

A diffusion dialysis and acid recovery technology, applied in the field of PVA-based anion exchange membrane and its preparation, can solve the problems of poor acid recovery performance, consumption of organic solvent, lack of chemical cross-linking, etc., and achieve excellent uniformity and strong controllability , cheap effect

Active Publication Date: 2014-08-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the performance of the membrane for acid recovery is not good.
In the prior art, there are problems such as lack of chemical crosslinking between the ion exchange groups in the membrane and the matrix, insufficient stability of the membrane, cumbersome preparation steps, consumption of a large amount of organic solvents, and large pollution.

Method used

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  • Diffusion dialysis membrane for recycling acid, as well as preparation method and application thereof
  • Diffusion dialysis membrane for recycling acid, as well as preparation method and application thereof
  • Diffusion dialysis membrane for recycling acid, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Diffusion dialysis membrane and preparation method thereof for acid recovery of the present invention can be summarized as follows:

[0038] The diffusion dialysis membrane used for acid recovery consists of an organic phase and an inorganic phase. The organic phase is polyvinyl alcohol (purchased from Wanwei Group), and the inorganic phase is 2,3-epoxypropyltrimethylammonium chloride ( (purchased from Dongying Guofeng Fine Chemical Co., Ltd.) and aminoalkoxysilane (purchased from Nanjing Chengong Organic Silicon Materials Co., Ltd.). The water content of the ion exchange membrane is 196-267%, the ion exchange capacity is 0.58-1.15mmol / g, the acid dialysis coefficient is 0.018-0.021m / h, and the separation factor is 18.6-21.

[0039] The method for preparing the above-mentioned diffusion dialysis membrane adopts the following steps:

[0040] (1) Dissolution of PVA:

[0041] Polyvinyl alcohol (PVA) is dissolved in water to form a solution with a mass concentration of 5%...

Embodiment 2

[0057] (1) Dissolution of PVA:

[0058] Soak 5g of polyvinyl alcohol (molecular weight: 77000±2000) raw material in 95g of water for one day, then raise the temperature to about 102°C at a heating rate of 5-10°C / h under stirring conditions, and keep it at 102°C for 2.5h , to obtain a uniform and transparent solution, which is cooled to about 60° C. for later use, and the mass concentration of the solution is 5%.

[0059] (2) PVA grafted 2,3-epoxypropyltrimethylammonium chloride:

[0060] Add 1.5 g of 2,3-epoxypropyltrimethylammonium chloride to the solution prepared above, adjust the pH value to 11-12 with KOH, and control the temperature range of the solution to 85° C.; magnetic stirring, and react for 6 hours.

[0061] (3) Preparation of membrane solution:

[0062] Graft 2,3-epoxypropyltrimethylammonium chloride to the PVA prepared in step (2) in proportion

[0063] 1 g of 3-aminopropyltrimethoxysilane was added to the solution, and after magnetic stirring, the temperatur...

Embodiment 3

[0074] (1) Dissolution of PVA:

[0075] Soak 5g of polyvinyl alcohol (molecular weight: 77000±2000) raw material in 95g of water for one day, then raise the temperature to about 102°C at a heating rate of 5-10°C / h under stirring conditions, and keep it at 102°C for 2.5h , to obtain a uniform and transparent solution, which is cooled to about 60° C. for later use, and the mass concentration of the solution is 5%.

[0076] (2) PVA grafted 2,3-epoxypropyltrimethylammonium chloride:

[0077] Add 2.5 g of 2,3-epoxypropyltrimethylammonium chloride to the solution prepared above, adjust the pH value to 11-12 with ammonia water, and control the temperature range of the solution to 90° C.; magnetic stirring, and react for 5 hours.

[0078] (3) Preparation of membrane solution:

[0079] Add 1 g of 3-aminopropyltrimethoxysilane to the PVA grafted 2,3-epoxypropyltrimethylammonium chloride solution prepared in step (2) in proportion, after magnetic stirring, heat up to 60°C, Stirring wa...

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Abstract

The invention discloses a diffusion dialysis membrane (anion-exchange membrane) for recycling acid, as well as a preparation method and application thereof. The diffusion dialysis membrane consists of an organic phase and an inorganic phase, wherein the organic phase is polyving akohol (PVA) grafting epoxy group ammonium salt; the inorganic phase is alkoxy silane compound with amino; a content of water in the diffusion dialysis membrane is 196-267%; an ion-exchange capacity is 0.58-1.15mmol/g; an acid dialysis coefficient is 0.018-0.021m/h; a separation factor is 18.6-21; the acid dialysis coefficient and the separation factor are better than a commercial film DF-120. Since the epoxy group ammonium salt comprising the ion exchange group is directly introduced to obtain the ion-exchange capacity, the reaction conditions of the epoxy group, hydroxyl and amino are mild, therefore, the reaction process is simple and controllable; the utilization rate of raw materials is high; since all the reaction processes are carried out in water phase in the absence of the organic solvent; the reaction processes are green and environmentally friendly; the prepared diffusion dialysis membrane is high in heat stability and applicable to the acid recycling field.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a PVA-based anion exchange membrane prepared by a sol-gel method for acid recovery by oriented diffusion dialysis and its preparation method and application. Background technique [0002] Acidic wastewater mainly comes from acid factories, chemical factories, chemical fiber factories, dye factories, metal pickling workshops and electroplating workshops. Some of them contain inorganic acids, some organic acids, or both. The acid concentration varies greatly, the low one is less than 1%, and the high one is more than 10%. Acidic wastewater is highly corrosive. If it is discharged directly without treatment, it will corrode pipes and structures; if it is discharged into the water body, it will change the pH value of the water body, interfere with the self-purification of the water body, and affect the growth of aquatic organisms and fishery production; If it enters t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D67/00B01D69/02B01J41/14C02F1/42C02F1/44B01D61/24
Inventor 徐铜文程从亮
Owner UNIV OF SCI & TECH OF CHINA
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