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A kind of modified water-soluble chitosan flocculant 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

Active Publication Date: 2020-06-26
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are strong hydrogen bonds between chitosan molecules and molecules, and the molecular structure is in a tight crystalline state, which is insoluble in water and most organic solvents, which limits its application to a large extent.

Method used

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  • A kind of modified water-soluble chitosan flocculant and preparation method thereof
  • A kind of modified water-soluble chitosan flocculant and preparation method thereof
  • A kind of modified water-soluble chitosan flocculant and preparation method thereof

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preparation example Construction

[0024] A preparation method of modified water-soluble chitosan flocculant, comprising:

[0025] Carboxymethyl reaction step: disperse chitosan in a mixed solution of isopropanol and sodium hydroxide, stir and alkalinize to obtain a reaction mixture; dissolve monochloroacetic acid in isopropanol, and then add dropwise to the reaction In the mixture, after the dropwise addition, react for 3-5 hours; 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 step: dissolve carboxymethyl chitosan in hydrochloric acid, adjust the pH value to 5 to obtain carboxymethyl chitosan solution; then dissolve 3,4-dihydroxyphenylacetic acid in a certain amount of water, 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 the mixed solution o...

Embodiment 1

[0039] A kind of preparation method of water-soluble chitosan flocculant, carries out as follows successively:

[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 h to obtain a reaction mixture. Dissolve 60mL of monochloroacetic acid in 50mL of isopropanol, and slowly drop it into the reaction mixture through a constant pressure dropping funnel. After the dropwise addition, keep the temperature at 50°C for 3-5h. After the reaction was completed, a large amount of ethanol aqueous solution was added to terminate the reaction, and the pH of the system was adjusted to 7 with a pre-prepared aqueous hydrochloric acid solution with a mass fraction of 10%. Then wash and dry to obtain carboxymethyl chitosan.

[0041] Cross-linking reaction step: dissolve 10 g of carboxymethyl chitosan in 60 mL of hydrochloric acid, then add 40-100 mL of water, and adjust the pH...

Embodiment 2

[0043] A kind of preparation method of water-soluble chitosan flocculant, carries out as follows successively:

[0044] Carboxymethyl reaction step: disperse 20 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 h to obtain a reaction mixture. Dissolve 80mL of monochloroacetic acid in 50mL of isopropanol, and slowly drop it into the reaction mixture through a constant pressure dropping funnel. After the dropwise addition, keep the temperature at 50°C for 3-5h. After the reaction was completed, a large amount of ethanol aqueous solution was added to terminate the reaction, and the pH of the system was adjusted to 7 with a pre-prepared aqueous hydrochloric acid solution with a mass fraction of 10%. Then wash and dry to obtain carboxymethyl chitosan.

[0045] Cross-linking reaction step: dissolve 15 g of carboxymethyl chitosan in 60 mL of hydrochloric acid, then add 40-100 mL of water, adjust the pH va...

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Abstract

The invention discloses a modified water-soluble chitosan flocculating agent and a preparation method thereof. The preparation method comprises the following steps: a carboxymethyl reaction step: dispersing chitosan into a mixed solution of isopropanol and sodium hydroxide, stirring for alkalization so as to obtain a reaction mixture, dissolving monochloro acetic acid into isopropanol to obtain asolution, dropwise adding the solution into the reaction mixture, reacting for 3-5 hours, adding an ethanol water solution to terminate the reaction, washing, and drying, so as to obtain carboxymethylchitosan; and a cross-linking reaction step: dissolving carboxymethyl chitosan into hydrochloric acid, adjusting the pH value to 5, dissolving 3,4-dihydroxyphenylacetic acid into a certain amount ofwater to obtain a solution, adding the solution into a carboxymethyl chitosan solution, dissolving a mixture of EDC and NHS into mixed liquid of water and ethanol to obtain a solution, adding the solution into a reaction solution, adding hydrogen peroxide into the reaction solution, stirring to maintain the pH value of the reaction solution at 4.5-5.0, and reacting at the room temperature for 9-11hours, so as to obtain the modified water-soluble chitosan flocculating agent. The flocculating agent disclosed by the invention has good water solubility and flocculating property.

Description

technical field [0001] The invention relates to a flocculant, in particular to a modified water-soluble chitosan flocculant and a preparation method thereof. Background technique [0002] The widely used inorganic flocculants and synthetic organic polymer flocculants inevitably have the possibility of secondary pollution, and natural polymer flocculants have become the trend of future development. Among a wide variety of natural polymers, chitosan has attracted extensive attention due to its special structure and excellent performance. Moreover, the characteristics of chitosan, a cationic polyelectrolyte due to the primary amino group, make itself as a flocculant, which can complex the heavy metal ions in the water body, and pass through the negatively charged suspended particles. And the role, and microbial pollutants through a series of different effects, and show good flocculation performance. However, there are strong hydrogen bonds between chitosan molecules and molec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C08B37/08
CPCC02F1/5263C08B37/003
Inventor 陈萌萌宋澄章周光邹志华
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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