A kind of synthetic method and application of water-soluble chitosan-based flocculant

A technology of water-soluble chitosan and synthesis method, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of long reaction time and achieve the effects of short synthesis time, good solubility, and shortened polymerization initiation time

Active Publication Date: 2018-08-17
NANJING TECH UNIV
View PDF3 Cites 3 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of synthetic method of water-soluble chitosan-based flocculant comprises the following steps:

[0022] In the first step, 7.64 g of chitosan powder was added to 50 mL of acetic acid solution with a pH of 2, and placed on a magnetic stirrer and stirred until dissolved, and 4.589 g of maleic anhydride aqueous solution was slowly added to the homogeneous solution. Stir with a stirrer until the solution is uniform, transparent and slightly yellowish. Place the obtained homogeneous and transparent solution in a water-bath shaker and shake it at 20°C for 6 hours. Purify and dry at 40° C., and the obtained product is N-acylated chitosan.

[0023] In the second step, add 2 g of N-acylated chitosan prepared in the first step, 30 mL of deionized water, 6 g of acrylamide, and 2 g of DAC to the quartz reactor in sequence, and stir until completely dissolved to form a homogeneous aqueous solution ;

[0024] The third step, in the monomer aqueous solution descr...

Embodiment 2

[0026] Embodiment 2: a kind of synthetic method of water-soluble chitosan-based flocculant comprises the following steps:

[0027] In the first step, 9.821 g of chitosan powder was added to 60 mL of formic acid solution with a pH of 3, and placed on a magnetic stirrer to stir until dissolved, and 5.892 g of maleic anhydride aqueous solution was slowly added to the homogeneous solution. Stir with a stirrer until the solution is uniform, transparent and light yellow. Place the obtained homogeneous and transparent solution in a water bath shaker at 40°C for 5 h. 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.

[0028] In the second step, add 3 g of N-acylated chitosan, 35 mL of deionized water, 5 g of acrylamide, and 2 g of DAC to the quartz reactor in sequence, and stir until completely dissolved to form a homogeneous aqueous solution;

[0029]In ...

Embodiment 3

[0031] Embodiment 3: a kind of synthetic method of water-soluble chitosan-based flocculant comprises the following steps:

[0032] In the first step, 12.132 g of chitosan powder was added to 75 mL of oxalic acid solution with a mass concentration of pH 4, and placed on a magnetic stirrer and stirred until dissolved, and 7.278 g of acetic anhydride aqueous solution was slowly added to the homogeneous solution. 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 h. After the water bath shakes, add ethanol and acetone solution to the product Precipitation and purification, and drying at 40°C, the product obtained is N-acylated chitosan.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
wavelengthaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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 TECH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap