Method for preparing amphiprotic chitosan flocculant

A technology of chitosan and flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of cumbersome preparation methods, difficult promotion, and low practical operability, and achieves wide application range, low cost, good resistance The effect of salt properties

Inactive Publication Date: 2008-11-19
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan is only soluble in acid solution, and the general preparation of amphoteric chitosan materials usually adopts two-step or multi-step methods.

Method used

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  • Method for preparing amphiprotic chitosan flocculant
  • Method for preparing amphiprotic chitosan flocculant
  • Method for preparing amphiprotic chitosan flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve chitosan in 0.5% acrylic acid aqueous solution, prepare the solution of 2% chitosan, after the solution is uniform, add cerium ammonium nitrate as initiator (addition amount is 3% of chitosan unit mole number) , then add another modifier acrylamide (mass ratio to chitosan: 5:1), and react at 45°C for 2 hours to obtain amphoteric chitosan grafted with polyacrylic acid and polyacrylamide. flocculant. Through titration analysis, the polyacrylic acid content is 10%, and the polyacrylamide content is 40% (by mass). Infrared spectrum of chitosan and amphoteric chitosan flocculant (chitosan grafted polyacrylamide-polyacrylic acid) see figure 1 ,from figure 1 See wavenumber 3400, 3200nm -1 O-H, N-H characteristic absorption peak; 1670, 1620nm -1 It is the characteristic absorption peak of amide carbonyl; 1409nm -1 It is the characteristic absorption peak with negative ion carbonyl, which proves that polyacrylamide and polyacrylic acid have been grafted onto the mo...

Embodiment 2

[0028] Dissolve chitosan in 1.0% acrylic acid aqueous solution, prepare the solution of 3% chitosan, after the solution is uniform, add cerium ammonium nitrate as initiator (addition amount is 2% of chitosan unit mole number) , then add another modifier acrylamide (mass ratio to chitosan: 5:1), and react at 45°C for 2 hours to obtain amphoteric chitosan grafted with polyacrylic acid and polyacrylamide. flocculant. After analysis, the polyacrylic acid content is 20%, the polyacrylamide content is 30% (mass), and its performance is similar to that of Example 1.

Embodiment 3

[0030] Dissolve chitosan in 0.5% acrylic acid aqueous solution, prepare the solution of 2% chitosan, after the solution is uniform, add cerium ammonium nitrate as initiator (addition amount is 3% of chitosan unit mole number) , then add another modifier acrylamide (mass ratio to chitosan: 8:1), and react for 2 hours at 45°C to obtain amphoteric chitosan grafted with polyacrylic acid and polyacrylamide. flocculant. After analysis, the polyacrylic acid content is 8%, the polyacrylamide content is 50% (by mass), and its performance is similar to that of Example 1.

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Abstract

The invention relates to a method for preparing an amphoteric chitosan flocculating agent. The method comprises the following steps that: chitosan is dissolved in an acrylic aqueous solution with a mass percentage concentration of between 0.1 and 1 percent so as to prepare a solution with a mass percentage concentration of chitosan of between 1 and 3 percent; the acquired solution is added with an ammonium ceric nitrate evocating agent, and is added with acrylamide; a mass ratio of the acrylamide to the chitosan is 1 to 1-8 to 1; and a mixture reacts for 2 to 4 hours at a temperature of between 45 and 65 DEG C, thereby preparing the amphoteric chitosan flocculating agent. The amphoteric chitosan flocculating agent prepared by the preparation method has the dual characteristics of having anionic groups and cationic groups, is suitable for processing a water body with different charges, has good salt resistance and wide application range and can be used both in an acid medium and an alkali medium. The method has simple operation, short synthetic time and low cost, uses natural macromolecular products with rich sources as main raw materials and is suitable for large industrialized production; and the method is an economic method for preparing and acquiring a high-quality water treatment agent.

Description

technical field [0001] The invention relates to a preparation method of an amphoteric chitosan flocculant. Background technique [0002] Water is a basic need for human survival. The safety and security work of drinking water has already attracted great attention from the Party Central Committee and the State Council. General Secretary Hu Jintao pointed out in early 2005 that "drinking water safety is related to the health of the masses and must be highly valued. Pollution sources, improvement of tap water purification and other measures, fundamentally solve the problem, and put people first into practice.” On July 1, 2007, the newly revised "Drinking Water Sanitation Standard" (GB 5749-2006) was officially implemented, ending the 21-year old standard (GB 5749-1985). 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. This has important practical significance for ensuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C02F1/56
Inventor 杨琥尚亚波袁博蒋玉祥卢耀柏秦祖群程镕时陈爱民
Owner NANJING UNIV
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