Synthesis method and application of water soluble chitosan-based flocculant

A technology of water-soluble chitosan and synthesis method, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of long reaction time, and achieve the effect of short synthesis time, accelerated polymerization reaction speed, and shortened polymerization initiation time.

Active Publication Date: 2016-06-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the above-mentioned deficiencies that exist in the prior art, the technical problem to be solved by the present invention is: how to provide a kind of synthetic method of water-soluble chitosan-based flocculant (maleic anhydride acylated chitosan-based flocculant), so that it can It solves the problems of long reaction time and the need to use toxic substances in the synthesis process of acylated chitosan-based flocculants, and has the characteristics of fast initiation speed, no need to add stabilizers, safe use, non-toxic and harmless, and low production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A kind of synthetic method of water-soluble chitosan-based flocculant, comprises the following steps:

[0022] The first step is to add 7.64g of chitosan powder to 50mL of acetic acid solution with a pH of 2, and place it on a magnetic stirrer and stir until dissolved, slowly add 4.589g of maleic anhydride aqueous solution to the homogeneous solution, and use a magnetic stirrer to Stir until the solution becomes a uniform, transparent and slightly yellow solution, place the obtained homogeneous and transparent solution in a water-bath shaker and shake at 20°C for 6 hours, and add ethanol and acetone solution to the product obtained after the water-bath shaking is completed for precipitation and purification. And placed in 40 DEG C to dry, the product obtained is N-acylated chitosan.

[0023] In the second step, add 2 g of N-acylated chitosan, 30 mL of deionized water, 6 g of acrylamide, and 2 g of DAC prepared in the first step to the quartz reactor in seque...

Embodiment 2

[0026] Example 2: A kind of synthetic method of water-soluble chitosan-based flocculant, comprises the following steps:

[0027] The first step is to add 9.821g of chitosan powder to 60mL of formic acid solution with a pH of 3, and place it on a magnetic stirrer and stir until dissolved, slowly add 5.892g of maleic anhydride aqueous solution to the homogeneous solution, and use a magnetic stirrer to Stir until the solution is a uniform, transparent and slightly yellow solution, place the obtained homogeneous and transparent solution in a water-bath shaker and shake at 40°C for 5 hours, and add ethanol and acetone solution to the product obtained after the water-bath shaking is completed for precipitation and purification. And placed in 40 DEG C to dry, the product obtained is N-acylated chitosan.

[0028] In the second step, add 3g of N-acylated chitosan, 35mL of deionized water, 5g of acrylamide, and 2g of DAC to the quartz reactor in sequence, and stir until completely dis...

Embodiment 3

[0031] Example 3: A kind of synthetic method of water-soluble chitosan-based flocculant, comprises the following steps:

[0032] The first step, to 75mL mass concentration is the chitosan powder that adds 12.132g in the oxalic acid solution that pH is 4, and is placed on the magnetic stirrer and stirs to dissolving, slowly adds the acetic anhydride aqueous solution of 7.278g in homogeneous solution, uses Stir with a magnetic stirrer until the solution is uniform, transparent and slightly yellow. Place the obtained homogeneous and transparent solution in a water bath shaker at 30°C for 8 hours. After the water bath shakes, add ethanol and acetone to the product for precipitation and purification, and placed in 40 ° C oven dry, the product obtained is N-acylated chitosan.

[0033] In the second step, add 2g of N-acylated chitosan, 35mL of deionized water, 5g of acrylamide, and 3g of DAC to the quartz reactor in sequence, and stir until completely dissolved to form a homogeneou...

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Abstract

The invention provides a synthesis method and application of a water soluble chitosan-based flocculant. The method comprises the steps of adding chitosan into acid solution, adding acylated monomer aqueous solution into the acid solution, uniformly stirring and mixing, performing vibration reaction for 1 to 10 h at 5 to 60 DEG C, performing precipitation and purification through ethyl alcohol and acetone, drying, and obtaining N-acylated chitosan; sequentially adding the N-acylated chitosan, deionized water, acrylamide and strong cation functional monomer into a reactor, uniformly stirring, leading nitrogen into homogenous solution to remove oxygen, adding a photoinitiator and a cosolvent, uniformly stirring and mixing, putting the raw materials into an ultraviolet light reaction device to perform polymerization reaction, drying, performing granulation and powder process, and obtaining the water soluble chitosan-based flocculant; the flocculant can be used for the removal treatment of alga in source water. The flocculant is good in solubility property, high in viscosity coefficient and short in synthesis time, does not need temperature reduction control, simplifies the production technology, reduces energy consumption, and reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of synthesis methods of water-soluble polymers, and in particular relates to a synthesis method and application of a water-soluble chitosan-based flocculant. Background technique [0002] Chitosan is an alkaline polysaccharide that exists in large quantities in nature. It is a deacetylated product of chitin. It has good properties such as biocompatibility, biodegradability, adsorption and non-toxicity. It is a polymer with extremely broad application prospects. compound. Because chitosan is insoluble in sulfuric acid and even more insoluble in water, it inhibits its wide application in various fields, and chitosan is soluble in solvents such as dilute hydrochloric acid and acetic acid, so it can be obtained by the acylation reaction of chitosan Acylated derivatives of chitosan to obtain a flocculant with good solubility. For example, at room temperature, acetic acid is used as the reaction medium, and chit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/34C08F2/48C08B37/08C02F1/56
CPCC02F1/56C08B37/003C08F2/48C08F251/00C08F220/56C08F220/34
Inventor 孙永军任梦娇徐炎华肖雪峰孙文全吴慧芳尤朝阳朱成雨梅凯
Owner NANJING UNIV OF TECH
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