Modified water-soluble chitosan flocculating agent and preparation method thereof
A water-soluble chitosan and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve problems such as limited applications, and achieve large flocs and fast flocculation speed , high adsorption efficiency
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[0024] A preparation method of modified water-soluble chitosan flocculant includes:
[0025] Carboxymethyl reaction step: disperse chitosan in a mixed solution of isopropanol and sodium hydroxide, stir and alkalize to obtain a reaction mixture; dissolve monochloroacetic acid in isopropanol, and then add dropwise to the reaction In the mixture, after the dripping is completed, react for 3-5h; after the reaction is completed, add excess ethanol aqueous solution to terminate the reaction, and adjust the pH of the system to 7; then wash and dry to obtain carboxymethyl chitosan;
[0026] Cross-linking reaction steps: Dissolve carboxymethyl chitosan in hydrochloric acid, adjust the pH value to 5 to obtain a carboxymethyl chitosan solution; then dissolve 3,4-dihydroxyphenylacetic acid in a certain amount of water, and add Into the carboxymethyl chitosan solution to obtain a reaction solution; then the mixture of EDC and NHS (abbreviated as EDC / NHS) is dissolved in a mixture of water and e...
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[0038] Example 1:
[0039] A preparation method of water-soluble chitosan flocculant is carried out in sequence as follows:
[0040] Carboxymethyl reaction step: Disperse 25 g of chitosan in a mixed solution of 100 mL of isopropanol and sodium hydroxide, stir and basify in a water bath at 50° C. for 2 hours to obtain a reaction mixture. Dissolve 60 mL of monochloroacetic acid in 50 mL of isopropanol, and slowly add dropwise to the reaction mixture through a constant pressure dropping funnel. After the addition is complete, maintain the temperature at 50°C for 3-5 hours. After the reaction is completed, a large amount of ethanol aqueous solution is added to terminate the reaction, and a pre-configured aqueous hydrochloric acid solution with a mass fraction of 10% is used to adjust the pH of the system to 7. After washing and drying, carboxymethyl chitosan is obtained.
[0041] Cross-linking reaction steps: Dissolve 10 g of carboxymethyl chitosan in 60 mL of hydrochloric acid, then a...
Example Embodiment
[0042] Example 2:
[0043] A preparation method of water-soluble chitosan flocculant is carried out in sequence as follows:
[0044] Carboxymethyl reaction step: Disperse 20 g of chitosan in 100 mL of a mixed solution of isopropanol and sodium hydroxide, stir and alkalize in a water bath at 50° C. for 2 hours to obtain a reaction mixture. Dissolve 80 mL of monochloroacetic acid in 50 mL of isopropanol, and slowly add dropwise to the reaction mixture through a constant pressure dropping funnel. After the addition is complete, maintain the temperature at 50°C for 3-5 hours. After the reaction is completed, a large amount of ethanol aqueous solution is added to terminate the reaction, and a pre-configured aqueous hydrochloric acid solution with a mass fraction of 10% is used to adjust the pH of the system to 7. After washing and drying, carboxymethyl chitosan is obtained.
[0045] Cross-linking reaction steps: Dissolve 15 g of carboxymethyl chitosan in 60 mL of hydrochloric acid, then...
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