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Water-soluble sulfonated/quaternized chitosan and preparation method thereof

A technology of quaternized chitosan and sulfonated chitosan, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the problems of increased energy consumption, complicated process, Problems such as single performance

Inactive Publication Date: 2013-04-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its relatively simple performance, it must be used together with other agents to achieve the purpose of use, which invisibly complicates the process and increases energy consumption.

Method used

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  • Water-soluble sulfonated/quaternized chitosan and preparation method thereof
  • Water-soluble sulfonated/quaternized chitosan and preparation method thereof
  • Water-soluble sulfonated/quaternized chitosan and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 0.40 g of chitosan with a degree of polymerization n of 30 in the reactor, stir and dissolve with 20 mL of 1% (w / w) acetic acid solution; add 0.03 g of ammonium persulfate under nitrogen protection, and continue stirring until the ammonium persulfate is completely dissolved ,; Dissolve 2.05g of AMPS in 20mL of water, transfer the solution into a constant pressure dropping funnel and assemble it on a reactor that has been placed in a constant temperature water bath at 60°C, and add the AMPS solution dropwise to the reactor under nitrogen protection, Continue to stir for 4 hours after all the drops are completed; the reactant is cooled to room temperature, the solution is adjusted to neutrality with 5% sodium hydroxide, precipitated with a mixed solvent (acetone:ethanol=1:1, v / v), and vacuum-dried to obtain Sulfonated chitosan was obtained. Scale inhibition evaluation shows that when n is 30, the scale inhibition rate of sulfonated chitosan is 89%.

[0043] The res...

Embodiment 2

[0048] The steps are the same as in Example 1, except that the chitosan whose degree of polymerization n is 60 is taken by weighing 0.40g, ammonium persulfate is 0.02g, the amount of AMPS is 1.02g, the temperature of the water bath is 40°C, and the reaction time is controlled to be 3h, thereby preparing Sulfonated chitosan was obtained. Scale inhibition evaluation shows that when n is 60, the scale inhibition rate of sulfonated chitosan is 73%.

Embodiment 3

[0050] The steps are the same as in Example 2, except that 0.40 g of chitosan whose degree of polymerization n is 180 is weighed, and the reaction conditions are controlled to prepare sulfonated chitosan. The scale inhibition evaluation shows that when n is 180, the scale inhibition rate of sulfonated chitosan is 53%.

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PUM

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Abstract

The invention relates to a water-soluble sulfonated / quaternized chitosan of which the structural formula is shown in the specification. The water-soluble sulfonated / quaternized chitosan provided by the invention is a multifunctional water treatment agent which simultaneously contains an anionic sulfonic acid group and a cationic quaternary ammonium group. Compared with the chitosan raw material, the functions of the water-soluble sulfonated / quaternized chitosan are increased, the water-soluble sulfonated / quaternized chitosan can be used in the treatment of industrial water and waste water to simultaneously solve the problems of scaling and microbe multiplication, and the anti-scaling and sterilization effect is improved by about 50-60%. In the structural formula, n is average degree of polymerization, and n is larger than or equal to and is smaller than or equal to 200.

Description

technical field [0001] The present invention relates to the preparation of sulfonated-quaternized chitosan, specifically chitosan and sulfonate through grafting reaction to synthesize sulfonated chitosan, and then react with quaternary ammonium salt to generate a water-soluble sulfonated chitosan - Quaternized chitosan. technical background [0002] Water is the resource that human production and life rely on for survival. In industrial water and wastewater treatment, especially in industrial circulating cooling water systems, oil fields, petrochemical and other industries, flocculants, corrosion inhibitors, scale inhibitors, and bactericides are often used. Agents and other water treatment chemicals. In recent years, including developed countries, phosphorus-free, easy biodegradation and environmental friendliness are common trends in the development of water treatment chemicals. [0003] Chitosan is the product obtained by deacetylation of chitin. It is a natural cationi...

Claims

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Application Information

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IPC IPC(8): C08B37/08C02F5/12C02F1/56C02F1/50
Inventor 张惠欣朱玉超王枫孙冬雪杨婷茹
Owner HEBEI UNIV OF TECH
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