Method for preparing biodegradable anion-exchange membrane

An anion-exchange membrane and biodegradable technology, applied in the field of preparation of biodegradable anion-exchange membranes, can solve environmental hazards and other problems, and achieve the effects of avoiding environmental problems, wide range of materials, and wide sources of raw materials

Inactive Publication Date: 2018-06-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides a method for preparing a biodegradable anion exchange membrane, which uses microcrystalline cellulose as a base material, and is cross-linked to form a film after acidification, hydrolysis and amination with hydrochloric acid; it has high mechanical strength, resistance Good acidity and alkalinity, high hydrophilicity, biodegradability and other characteristics; solve the problem of harm to the environment after the existing ion exchange membrane is discarded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, preparation of biodegradable anion exchange and use in electrodialysis to recover waste acid produced by liquid phase desulfurization, the specific preparation process is as follows:

[0025] (1) Mix microcrystalline cellulose and hydrochloric acid solution with a mass concentration of 42% at a mass ratio of 1:5. After ultrasonic treatment at 45°C for 4 h, add water 5 times the volume of the mixture, and then sonicate for 0.5 h to obtain Milky white suspension, sonicated with an ultrasonic power of 500 W;

[0026] (2) Centrifuge the milky white suspension obtained in step (1) at 12,000 r / min for 10 min, collect the sol in the upper layer, and dialyze until the sol is neutral;

[0027] (3) Soak the sol with 10 times the volume of the sol obtained in step (2) in a sodium hydroxide solution with a mass concentration of 10% for 2 hours, and then centrifuge at 12000 r / min for 20 min to collect the upper sol;

[0028] (4) At 80°C, mix the sol obtained in step (...

Embodiment 2

[0036] Embodiment 2, the preparation of biodegradable anion exchange and be used for reclaiming the nitric acid in the iron and steel pickling waste water, concrete preparation process is as follows:

[0037] 1. The specific preparation process of biodegradable anion exchange is as follows:

[0038] (1) Mix microcrystalline cellulose and hydrochloric acid solution with a mass concentration of 40% at a mass ratio of 1:15, ultrasonicate at 30°C for 2 h, add water 10 times the volume of the mixture, and then ultrasonicate for 1 h to obtain Milky white suspension, sonicated with an ultrasonic power of 800 W;

[0039] (2) Centrifuge the milky white suspension obtained in step (1) at 10,000 r / min for 20 min, collect the sol in the upper layer, and dialyze until the sol is neutral;

[0040] (3) Soak the sol with 15 times the volume of the sol obtained in step (2) in 20% sodium hydroxide solution for 2.5 h, then centrifuge at 10000 r / min for 15 min to collect the upper sol;

[0041]...

Embodiment 3

[0049] Embodiment 3, the preparation of biodegradable anion exchange and be used for reclaiming the high-concentration sulfuric acid waste water containing sodium sulfate, concrete preparation process is as follows:

[0050] (1) Mix microcrystalline cellulose and hydrochloric acid solution with a mass concentration of 38% at a mass ratio of 1:10, ultrasonicate at 50°C for 3 h, add water 7 times the volume of the mixture, and then ultrasonicate for 1 h to obtain Milky white suspension, sonicated with an ultrasonic power of 600 W;

[0051] (2) Centrifuge the milky white suspension obtained in step (1) at 11,000 r / min for 15 min, collect the sol in the upper layer, and dialyze until the sol is neutral;

[0052] (3) Soak the sol in 20% sodium hydroxide solution with a mass concentration 20 times the volume of the sol obtained in step (2) for 3 hours, then centrifuge at 11000 r / min for 15 min to collect the upper sol;

[0053] (4) At 85°C, mix the sol obtained in step (3) with a 4...

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Abstract

The invention belongs to the technical field of membrane separation and in particular relates to a method for preparing a biodegradable anion-exchange membrane. The method comprises the following steps: by taking microcrystalline cellulose as a base material, performing acidification hydrolysis and amination with hydrochloric acid, and performing cross-linking, thereby obtaining the anion-exchangemembrane which has the characteristics of being high in mechanical strength, good in acid-alkali resistance, good in hydrophilcity, biodegradability, and the like. The membrane is applicable to acid-alkali enriched environments of electroosmosis application environments and can be naturally degraded in the environments after the service life, and the problem that the environment can be damaged byconventional discarded ion exchange membranes can be solved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a biodegradable anion exchange membrane. Background technique [0002] Since the 1960s, the industrial application of electrodialysis based on ion exchange membranes has developed in an all-round way, and has been widely used in the desalination of brackish water, desalination and concentration of industrial electrolyte feed solutions, and environmental protection. Especially in the area of ​​environmental governance, it plays an important role in the treatment of acid-base waste liquid and waste gas, and is a powerful technical guarantee for the sustainable development of my country's metal processing industry, metallurgical industry, rare earth industry, and micro-powder manufacturing industry. The annual output of ion exchange membranes in my country is about 300,000 tons, and with the expansion of the application range of electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44B01D67/00C02F1/469C01B17/90
CPCB01D61/44B01D67/0006C01B17/902C02F1/4693
Inventor 瞿广飞李志顺成宁平解若松高海均马曦
Owner KUNMING UNIV OF SCI & TECH
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