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Chitosan copolymer as well as preparation and application thereof

A chitosan copolymer, chitosan technology, applied in descaling and water softening, chemical instruments and methods, special treatment targets, etc.

Active Publication Date: 2021-12-07
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on chitosan derivatives as scale and corrosion inhibitors is still in the initial stage, and there are relatively few related literature reports at home and abroad.

Method used

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  • Chitosan copolymer as well as preparation and application thereof
  • Chitosan copolymer as well as preparation and application thereof
  • Chitosan copolymer as well as preparation and application thereof

Examples

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preparation example Construction

[0032] The preparation method of chitosan-acrylic acid-aspartic acid provided by the invention, its concrete method steps are as follows:

[0033] (1) Synthesis of chitosan-benzaldehyde Schiff base (CTS-BE):

[0034] Add CTS (0.02M) and 100mL distilled water in the three-necked flask, and 2 Under protection, benzaldehyde ethanol solution (0.02M) was added dropwise to the flask, and stirred at 60°C for 12h. The formed pale yellow precipitate was washed three times with distilled water, and dried in a vacuum oven at 60°C for 24 hours to obtain chitosan-benzaldehyde Schiff base, and the reaction equation was as follows:

[0035]

[0036] (2) Synthesis of chitosan-acrylic acid copolymer (O-CTS-AA):

[0037] Chitosan-benzaldehyde (0.01 M) and 0.1 g of ammonium persulfate were dissolved in 100 mL of acetic acid solution (1%). Under the protection of nitrogen, the mixture was stirred at 80°C for 0.5h, then a certain amount of acrylic acid (AA) solution was added dropwise, the m...

Embodiment 1

[0050] A kind of preparation method of chitosan copolymer water treatment agent, comprises the steps:

[0051] Weigh 3.2g of chitosan, measure 100mL of distilled water in a three-neck flask, add 2.1g of benzaldehyde-ethanol solution dropwise to the flask under nitrogen protection, and stir at 60°C for 12h. The formed pale yellow precipitate was washed three times with distilled water, and dried in a vacuum oven at 60° C. for 24 h to obtain chitosan-benzaldehyde Schiff base. 2.66g of chitosan-benzaldehyde and 0.1g of ammonium persulfate were dissolved in 100mL of 1% acetic acid solution. Under the protection of nitrogen, the mixture was stirred at 80° C. for 0.5 h, then 2.16 g of acrylic acid solution was added dropwise, and the reaction was continued for 6 h. The product was precipitated with 200 mL of acetone, the precipitate was washed with absolute ethanol and filtered three times, and dried at 60 °C for 1 h to obtain O-carboxyethyl-benzaldehyde chitosan Schiff base. Acid...

Embodiment 2

[0053] A kind of preparation method of chitosan copolymer water treatment agent, comprises the steps:

[0054] Weigh 3.2g of chitosan, measure 100mL of distilled water in a three-neck flask, add 2.1g of benzaldehyde-ethanol solution dropwise to the flask under nitrogen protection, and stir at 60°C for 12h. The formed pale yellow precipitate was washed three times with distilled water, and dried in a vacuum oven at 60° C. for 24 h to obtain chitosan-benzaldehyde Schiff base. 2.66g of chitosan-benzaldehyde and 0.1g of ammonium persulfate were dissolved in 100mL of 1% acetic acid solution. Under the protection of nitrogen, the mixture was stirred at 80° C. for 0.5 h, then 2.16 g of acrylic acid solution was added dropwise, and the reaction was continued for 6 h. The product was precipitated with 200 mL of acetone, the precipitate was washed with absolute ethanol and filtered three times, and dried at 60 °C for 1 h to obtain O-carboxyethyl-benzaldehyde chitosan Schiff base. Acid...

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Abstract

The invention discloses a preparation method of a water treatment agent, namely a chitosan copolymer applicable to municipal wastewater. The preparation method comprises the following steps that firstly, chitosan reacts with benzaldehyde to generate chitosan-benzaldehyde Schiff base used for protecting amino groups on chitosan molecules; then the chitosan-benzaldehyde Schiff base reacts with acrylic acid to generate O-carboxyethyl-benzaldehyde chitosan Schiff base; the O-carboxyethyl-benzaldehyde chitosan Schiff base is acidified with hydrochloric acid to remove a formaldehyde protecting group and then reacts with polysuccinimide to generate a chitosan-acrylic acid-aspartic acid copolymer; and the chitosan-acrylic acid-aspartic acid copolymer is purified, filtered and dried to obtain a brown yellow solid. The chitosan copolymer is applicable to municipal wastewater and has excellent scale and corrosion inhibition performance.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular relates to the preparation and application of a water treatment agent chitosan copolymer. Background technique [0002] Water shortage is one of the most important global problems. The consumption of cooling water accounts for about 70% of the total industrial water consumption. Therefore, recycling industrial cooling water can greatly reduce water consumption and sewage discharge. However, due to the long-term operation of the circulating cooling water system at high multiples, problems such as scaling, corrosion, and bacteria and algae are prone to occur, which makes the operation and management of the circulating cooling water difficult. Therefore, the circulating cooling water must be treated. Adding water treatment chemicals to the circulating cooling water system is the most direct and effective way to prevent system scaling and corrosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
CPCC02F5/12C02F2303/08
Inventor 高玉华刘振法王深琳吴根修张利辉郑玉轩
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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