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Preparation method of grafted amphoteric starch flocculants

An amphoteric starch and flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of uncharged starch molecules, inactive chemical properties, and narrow applicable pH range, so as to improve water solubility and enhance cohesion. Bridge flocculation, the effect of a wide range of applications

Inactive Publication Date: 2013-05-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch also has many shortcomings in practical applications, such as: starch molecules themselves have no charge, chemical properties are inactive, poor solubility, relatively low molecular weight, and narrow applicable pH range, etc.

Method used

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  • Preparation method of grafted amphoteric starch flocculants
  • Preparation method of grafted amphoteric starch flocculants
  • Preparation method of grafted amphoteric starch flocculants

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Disperse the starch in 5% aqueous sodium hydroxide solution (the ratio of starch to aqueous sodium hydroxide solution is 1:4), alkalize at 70°C for 1 hour; after that, add trimethyl chloride-(3-chloro-2-hydroxy ) propylammonium, trimethyl-(3-chloro-2-hydroxy)propylammonium chloride and starch mass ratio 2:1, react at 70°C for 2h; Obtain cationic starch, dissolve cationic starch in water, prepare a solution with a mass percentage concentration of cationic starch of 1%, after the solution is uniform, add ammonium persulfate as an initiator (the addition is 2% of the molar number of starch units), and then Add a mixture of acrylamide (mass ratio to cationic starch: 5:1) and acrylic acid (mass ratio to cationic starch: 3:1), react at 45°C for 4 hours, and then use acetone as a precipitant to precipitate and separate the product, namely A grafted amphoteric starch flocculant is obtained. According to nuclear magnetic analysis, the degree of substitution of cationic groups is...

Embodiment 2

[0039] Disperse the starch in 1% potassium hydroxide aqueous solution (the ratio of starch to sodium hydroxide aqueous solution is 1:5), alkalinize at 20°C for 2 hours; after that, add trimethyl chloride-(3-chloro-2-hydroxy ) propylammonium, trimethyl-(3-chloro-2-hydroxy)propylammonium chloride and starch mass ratio 3:1, react at 30°C for 0.5h; , to obtain cationic starch, dissolve cationic starch in water, and prepare a solution with a mass percent concentration of cationic starch of 2%. After the solution is uniform, add ammonium persulfate as an initiator (the amount added is 3% of the molar number of starch units) , then add acrylamide (mass ratio to cationic starch: 1:1) and acrylic acid (mass ratio to cationic starch: 8:1), react at 50°C for 6 hours, and then use ethanol as a precipitant to precipitate and separate the product. That is, the grafted amphoteric starch flocculant is obtained. According to the analysis by nuclear magnetic method, the degree of substitution ...

Embodiment 3

[0041] Disperse the starch in 15% aqueous sodium hydroxide solution (the ratio of starch to aqueous sodium hydroxide solution is 1:3.5), and alkalize it at 40°C for 2 hours; after that, add trimethyl chloride-(3-chloro-2-hydroxy ) propylammonium, trimethyl-(3-chloro-2-hydroxy)propylammonium chloride and starch mass ratio 1.5:1, react at 45°C for 4h; To obtain cationic starch, dissolve cationic starch in water, and prepare a solution with a mass percentage concentration of cationic starch of 3%. After the solution is uniform, add cerium ammonium nitrate as an initiator (addition amount is 1% of the molar number of starch units), Then add acrylamide (mass ratio to cationic starch: 3:1) and acrylic acid (mass ratio to cationic starch: 6:1), react at 60°C for 3 hours, then use acetone as precipitant to precipitate and separate the product, namely A grafted amphoteric starch flocculant is obtained. According to nuclear magnetic analysis, the degree of substitution of cationic grou...

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Abstract

The invention discloses a preparation method of grafted amphoteric starch flocculants, which is implemented by carrying out graft copolymerization on cationic starches, acrylamide and an acrylic acid so as to obtain a grafted amphoteric starch flocculant, and the grafted amphoteric starch flocculant has the following structure shown in the abstract. The method disclosed by the invention has the following advantages that because a molecular chain is rich in anion-cation groups and has amphoteric characteristics, not only is the flocculation property of materials improved, and also the dissolving property of starches is improved; high polymer materials are wide in resource and low in cost, so that the grafted amphoteric starch flocculant has a high performance price ratio; starches have biodegradability and are non-toxic, so that starches do not produce secondary pollution to water bodies; the grafted amphoteric starch flocculant has various good effects such as flocculation, metal ion adsorption, bacteriostasis, deodorization, decoloring, and capability of effectively reducing the COD value; the grafted amphoteric starch flocculant has a characteristic of high efficiency, and is low in putting amount, and the putting amount is generally 0.1-10mg / L; and the the grafted amphoteric starch flocculant is suitable for treating water bodies with different charges, good in salt resistance and wide in applied pH range, and can be applied when the pH value is 1-12.

Description

technical field [0001] The invention relates to a preparation method of a grafted amphoteric starch flocculant. Background technique [0002] In recent years, with the rapid economic development and continuous industrial development, water pollution has become increasingly serious; and water is a basic need for human survival. The safety and security of drinking water has already attracted great attention from the country. On July 1, 2007, the newly revised "Drinking Water Sanitation Standard" (GB5749-2006) was officially implemented, ending the 21-year old standard (GB5749-1985). The indicators stipulated in the new standard have been greatly increased from the original 35 to 106, and the limits of some indicators are also stricter. In addition, from 2008 to 2011, the state successively released 18 new and more stringent industry emission standards including pulp and paper, electroplating, chemical fertilizers, and pesticides. Effective treatment of sewage is of great pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/06C08B31/12C02F1/56
Inventor 杨琥杨朕袁博黄牧李爱民
Owner NANJING UNIV
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