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

Active Publication Date: 2018-03-20
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are strong hydrogen bonds between chitosan molecules and molecules, and the molecular structure is in a tigh

Method used

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  • Modified water-soluble chitosan flocculating agent and preparation method thereof
  • Modified water-soluble chitosan flocculating agent and preparation method thereof
  • Modified water-soluble chitosan flocculating agent and preparation method thereof

Examples

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Example Embodiment

[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...

Example Embodiment

[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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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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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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