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Method for preparing chitosan-like efficient flocculant

The technology of chitosan and flocculant is applied in the field of preparation of chitosan-type high-efficiency flocculant, which can solve the problem of high production cost and achieve the effects of convenient application, remarkable effect and good effect.

Active Publication Date: 2015-05-06
ZHEJIANG SILK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing dicyandiamide-formaldehyde and chitosan flocculants use glutaraldehyde as a crosslinking agent to make chitosan and dicyandiamide crosslink, and the production cost is relatively high.

Method used

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  • Method for preparing chitosan-like efficient flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of chitosan-based high-efficiency flocculant includes the following steps in sequence:

[0021] 1) Pretreatment of chitosan: dissolve chitosan in an acetic acid solution of pH=5, stir evenly, add alkali to pH=9 to precipitate the chitosan, and filter for later use;

[0022] 2) Preparation of high-efficiency flocculant: take 1 part of the above chitosan, 3 parts of glutaraldehyde crosslinking agent, 1 part of urea, 1.5 parts of aluminum sulfate and put them in a four-necked flask, stir, and pre-react in a 60℃ water bath. Hours; then add 2.1 parts of dicyandiamide and 0.9 parts of urea, and continue to react for 2 hours to obtain a urea-chitosan-dicyandiamide composite flocculant;

[0023] 3) Purification of the product: After the reaction is completed, the product is separated out with acetone, filtered with suction, then washed with ethanol, filtered with suction and dried in an oven at 90°C for use.

[0024] The printing and dyeing wastewater is treated ...

Embodiment 2

[0028] The preparation method of chitosan-based high-efficiency flocculant includes the following steps in sequence:

[0029] 1) Pretreatment of carboxymethyl chitosan: Dissolve carboxymethyl chitosan in an acetic acid solution with pH=5, stir well, add alkali to pH=9 to precipitate carboxymethyl chitosan, and filter with suction.

[0030] 2) Preparation of high-efficiency flocculant: Take 2 parts of the above carboxymethyl chitosan, 5 parts of glyoxal crosslinking agent, 1 part of urea, 3 parts of aluminum sulfate in a four-necked flask, stir, and preheat in a water bath at 80°C. React for 0.5 hour. Then add 2.4 parts of dicyandiamide and 0.6 parts of urea, and continue to react for 4 hours to obtain a urea-chitosan-dicyandiamide composite flocculant;

[0031] 3) Purification of the product: After the reaction is completed, the product is separated out with acetone, filtered with suction, then washed with ethanol, filtered with suction and dried in an oven at 90°C for use.

[0032] ...

Embodiment 3

[0036] The preparation method of chitosan-based high-efficiency flocculant includes the following steps in sequence:

[0037] 1) Pretreatment of 0-hydroxyethyl chitosan: Dissolve 0-hydroxyethyl chitosan in an acetic acid solution with pH=5, stir evenly, add alkali to pH=9 to polymerize O-hydroxyethyl chitosan The sugar is separated out and filtered with suction.

[0038] 2) Preparation of high-efficiency flocculant: take 1.5 parts of the above-mentioned O-hydroxyethyl chitosan, 4 parts of glutaraldehyde crosslinking agent, 1 part of urea, and 2 parts of aluminum sulfate in a four-necked flask, stir, and in a water bath at 70℃ Pre-reaction for 0.8 hours. Then, 2.4 parts of dicyandiamide and 0.6 parts of urea were added, and the reaction was continued for 3 hours to obtain a urea-chitosan-dicyandiamide composite flocculant;

[0039] 3) Purification of the product: After the reaction is completed, the product is separated out with acetone, filtered with suction, then washed with ethan...

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Abstract

The invention discloses a method for preparing chitosan-like efficient flocculant, which comprises the following steps of: (1) pre-treatment of chitosan and derivatives of chitosan: dissolving chitosan and derivatives of chitosan in an acetic acid solution with pH value being 5, uniformly stirring, adding alkali until the pH value is 9 and chitosan separates out, and carrying out suction filtration for later use; (2) preparation of efficient flocculant: adding 1-2 parts of the pre-treated chitosan and derivatives of chitosan, 3-5 parts of cross-linking agents, 1 part of carbamide and 1.5-3 parts of aluminum sulfate in a four-port flask, stirring, pre-reacting for 0.5-1h in a water bath at 60-80 DEG C, then adding 3-8 parts of a dicyandiamide and carbamide mixed modifier, continuing to react for 2-4h, to obtain carbamide-chitosan-dicyandiamide like composite flocculant; and (3) purification of the product: after the reaction, separating out the product by using acetone; carrying out suction filtration; washing the product with ethanol; carrying out suction filtration, and drying in an oven at 90 DEG C for further use.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a preparation method of a chitosan type high-efficiency flocculant. Background technique [0002] China is a major textile printing and dyeing country, and tens of thousands of tons of wastewater are discharged every day. Printing and dyeing wastewater has the characteristics of large water volume, high chroma, high COD value and difficult to biodegrade. It is difficult to treat, and the treatment effect is poor. At present, coagulation methods that are relatively easy to operate are usually used to treat printing and dyeing wastewater, mainly using aluminum salts, iron salts and polyacrylamide coagulants. However, these coagulants have their own shortcomings and deficiencies. When the aluminum ion concentration in the water is greater than 0.5 mg / L, it can kill salmon and have toxic effects on soil, plants and microorganisms; and iron salts themselves have light g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08C08J3/24C08L5/08C02F1/56
Inventor 陈小利叶建军姚庆才阮铁民
Owner ZHEJIANG SILK TECH
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