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Preparation method for anionic chitosan water-treatment flocculant

An anionic, flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as harm to human health, high aluminum salt content, treatment blind spots, etc., to achieve no toxic side effects, less dosage, easy to remove. Effect

Inactive Publication Date: 2013-12-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyaluminum chloride itself also has certain environmental pollution problems, which may cause high aluminum salt content in water and endanger human health.
Anionic polyacrylamide has a certain treatment blind area due to the non-ionic polyacrylamide contained in the wastewater

Method used

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  • Preparation method for anionic chitosan water-treatment flocculant
  • Preparation method for anionic chitosan water-treatment flocculant
  • Preparation method for anionic chitosan water-treatment flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 2g chitosan (deacetylation degree 83%, molecular weight 1.09×10 5 ) was dissolved in 100mL of 1% glacial acetic acid, stirred evenly at room temperature, and then 1.5mL of 50% phosphorous acid solution was continuously added dropwise at room temperature (the weight ratio of the two was 1:0.375). Raise the temperature to 90°C, stir and mix the reaction, add dropwise 50mL of 20% formaldehyde solution (5 times the mass of chitosan, 0.36mol), and reflux for 24h. The product was neutralized to pH 7.4, dialyzed and freeze-dried to obtain the product.

[0029] The anionic chitosan obtained in Example 1 is used to treat the papermaking wastewater of a certain company: directly add anionic chitosan with a concentration of 170ppm in the wastewater that has been preliminarily settled and filtered, stir quickly for a certain period of time, reduce the stirring speed, and stir slowly After a certain period of time, let it stand still and filter to obtain a clear water sample. The ...

Embodiment 2

[0031] 2g high-density chitosan (deacetylation degree 95%, molecular weight 3.40×10 8 ) was dissolved in 100mL of 1% glacial acetic acid, stirred evenly at room temperature, and then continuously added dropwise with 1.5mL of 50% phosphoric acid solution at room temperature. Raise the temperature to 90°C, stir and mix the reaction, add dropwise 50mL of 20% formaldehyde solution, and reflux for 24h. The product was neutralized to pH 7.2, dialyzed and freeze-dried to obtain the product.

[0032] The anionic chitosan obtained in Example 2 is used to treat the papermaking wastewater of a certain company: directly add anionic chitosan with a concentration of 300ppm in the wastewater through preliminary sedimentation and filtration, stir quickly for a certain period of time, reduce the stirring speed, and stir slowly After a certain period of time, let it stand still and filter to obtain a clear water sample. The COD value of the water sample was measured by the potassium dichromat...

Embodiment 3

[0034] 2g chitosan (deacetylation degree 83%, molecular weight 1.09×10 5 ) was dissolved in 100mL of 1% dilute hydrochloric acid, stirred evenly at room temperature, and then continuously added dropwise with 1.5mL of 50% phosphoric acid solution at room temperature, heated to 90°C and stirred for mixed reaction, then added dropwise with 50mL of 20% formaldehyde solution, and refluxed for 12 hours. The product was neutralized to pH 7.4, dialyzed and freeze-dried to obtain the product.

[0035] The anionic chitosan obtained in Example 3 is used to treat the papermaking wastewater of a certain company: directly add anionic chitosan with a concentration of 120 ppm in the wastewater that has been preliminarily settled and filtered, stir quickly for a certain period of time, reduce the stirring speed, and stir slowly After a certain period of time, let it stand still and filter to obtain a clear water sample. The COD value of the water sample was measured by the potassium dichromat...

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Abstract

The invention relates to a preparation method for anionic chitosan water-treatment flocculant. The method comprises the following steps: continuously dripping chitosan acid solution with the percentage concentration by weight of 0.5 to 5% into strong acid water solution according to the weight ratio of 1:0.1-0.8, stirring, mixing and reacting under 70 DEG C to 90 DEG C, dripping aldehyde solution, performing reflux reaction for 8 to 24 hours, neutralizing the obtained solution to the pH range of 7 to 8, and dialyzing and freeze drying to obtain a product. The preparation method has the advantages that the source of raw materials is wide, the preparation technology is simple and convenient, the requirements on temperatureand pressure during the synthesis process are simple, the production period is short, and industrial implementation is easy; the product is a polymer material, is easy to degrade, has no toxicity or side effect and has the environmental-friendly property; the product can be directly added into waste water as well as added after being prepared into solution, the operation is simple, the flocculation and precipitation speed is high, and produced solid impurities are easy to remove; the product is small in use amount and low in cost and has a good cation flocculation effect.

Description

technical field [0001] The invention belongs to the technical field of water treatment flocculation, and in particular relates to a preparation method of an anionic chitosan water treatment flocculant which can be used for water treatment. Background technique [0002] In water treatment flocculation technology, flocculant is a very important part. Since the use of flocculant to treat wastewater involves few process links and the treatment effect is relatively good, the preparation and application process of flocculant has always been a research hotspot. At present, the commonly used flocculants are mainly divided into inorganic flocculants and organic flocculants. Among them, organic flocculants can be divided into three categories: anionic, cationic and nonionic. A large amount of wastewater will be produced in modern industrial production, and there are often defoamers, silica sol, cationic starch and other substances containing cationic properties that are difficult to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C02F1/56
Inventor 郑化郑浩然李单
Owner WUHAN UNIV OF TECH
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