Temperature sensitive chitosan flocculant and preparing method and application thereof

A chitosan and sensitive technology, which is applied in the field of temperature-sensitive chitosan flocculant and its preparation, can solve the problems of limited application scope, no temperature sensitivity of temperature switch, and no secondary pollution risk. , Excellent flocculation ability, wide range of effects

Active Publication Date: 2016-10-12
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that traditional flocculants cannot combine hydrophilic and hydrophobic pollutants at the same time, do not have the temperature sensitivity of the temperature switch near normal temperature, and have limited application range, the present invention provides a kind of Sensitive chitosan flocculant and its preparation method and application

Method used

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  • Temperature sensitive chitosan flocculant and preparing method and application thereof
  • Temperature sensitive chitosan flocculant and preparing method and application thereof
  • Temperature sensitive chitosan flocculant and preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0054] Acryloyl chloride, n-propylamine and triethylamine were respectively dissolved in toluene (wherein the molar ratio of acryloyl chloride, n-propylamine and triethylamine was 1:1.1:1.2) for use. At 4°C, the acryloyl chloride solution was slowly added dropwise to a mixed solution of n-propylamine and triethylamine (solvent is toluene) with stirring for 1 hour, and then the mixture was stirred and reacted at 25°C for 24 hours. The reaction mixture was filtered to remove the resulting precipitate, resulting in a monomer (in toluene) solution. Thioglycolic acid was dissolved in toluene (the molar ratio of acryloyl chloride and thioglycolic acid was 20:1), placed in a round-bottomed flask, and stirred to dissolve completely. The temperature was raised to 60 °C, and nitrogen was introduced for 30 min to remove the oxygen in the solution. Add 2,2'-azoisobutyronitrile (AIBN for short, the solvent is toluene, the molar mass ratio of 2,2'-azoisobutyronitrile to acryloyl chloride i...

Embodiment 2

[0057] Acryloyl chloride, n-propylamine and triethylamine were respectively dissolved in toluene (wherein the molar ratio of acryloyl chloride, n-propylamine and triethylamine was 1:1.2:2) for use. The acryloyl chloride solution was slowly added dropwise to a mixed solution of n-propylamine and triethylamine (solvent is toluene) at 4°C for 1 hour while stirring, and then the mixture was stirred at 30°C for 12 hours. The reaction mixture was filtered to remove the resulting precipitate, resulting in a monomer (in toluene) solution. Thioglycolic acid was dissolved in toluene (the molar ratio of acryloyl chloride and thioglycolic acid was 18:1), placed in a round-bottomed flask, and stirred to dissolve completely. The temperature was raised to 70°C, and nitrogen gas was introduced for 30min to remove the oxygen in the solution. Add 2,2'-azoisobutyronitrile (solvent is toluene, the molar mass ratio of 2,2'-azoisobutyronitrile to acryloyl chloride is 1:3, solvent and 2,2'-azoisobuty...

Embodiment 3

[0060] Acryloyl chloride, n-propylamine and triethylamine were respectively dissolved in toluene (wherein the molar ratio of acryloyl chloride, n-propylamine and triethylamine was 1:1.3:1.4) for use. The acryloyl chloride solution was slowly added dropwise to a mixed solution of n-propylamine and triethylamine (solvent is toluene) at 4°C for 1 hour while stirring, and then the mixture was stirred at 23°C for 15 hours. The reaction mixture was filtered to remove the resulting precipitate, resulting in a monomer (in toluene) solution. Thioglycolic acid was dissolved in toluene (the molar ratio of acryloyl chloride to thioglycolic acid was 16:1), placed in a round-bottomed flask, and stirred to dissolve completely. The temperature was raised to 80°C, and nitrogen gas was introduced for 30min to remove the oxygen in the solution. Add 2,2'-azoisobutyronitrile (solvent is toluene, the molar mass ratio of 2,2'-azoisobutyronitrile to acryloyl chloride is 1:4, solvent and 2,2'-azoisob...

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Abstract

The invention discloses temperature sensitive chitosan flocculant and a preparing method and application thereof, and belongs to the field of high-molecular compounds. Temperature-sensitive monomers are polymerized, then chitosan molecules are introduced to obtain the temperature sensitive chitosan flocculant, and the temperature conversion switch is at about 25 DEG C; by means of the method of carrying out graft modification after polymerization, the number and molecular weight of functional groups are increased, the bridging flocculation action is enhanced, and the requirement for more common flocculation removal of pollutants in a polluted water body at the temperature of 25 DEG C can be met; as a poly(n-propyl) acrylamide grafted chain can generate hydrophily or hydrophobicity along with temperature changes, the application range is wider, the requirement for flocculation removal of the water body pollutants with different characteristics under different environment conditions can be met, and the flocculant particularly has excellent flocculation capacity to the pollutants with hydrophily / hydrophobicity converted easily in the water body.

Description

technical field [0001] The invention belongs to the field of macromolecular compounds, and more particularly relates to a temperature-sensitive chitosan flocculant and a preparation method and application thereof. Background technique [0002] Water is the source of life. Water is an essential element for human production and life. However, from a global perspective, water pollution is becoming more and more prominent. The "2014-2018 China Sewage Treatment Industry Market Prospect and Investment Planning Analysis Report" shows that with the continuous advancement of my country's modernization and industrialization, the total amount of wastewater discharge has continued to grow. From 2001 to 2012, my country's total wastewater discharge increased from 43.3 billion tons in 2001 to 68.5 billion tons in 2012, and the total wastewater discharge increased by 25.2 billion tons, with an average annual discharge of 2.1 billion tons of wastewater, with an average compound annual gro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C02F1/56
CPCC02F1/56C08G81/02
Inventor 杨朕任可馨杨维本沈佳淳张讯通
Owner NANJING NORMAL UNIVERSITY
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