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A kind of temperature sensitive chitosan flocculant and its preparation method and application

A chitosan, sensitive technology, applied in the field of temperature-sensitive chitosan flocculant and its preparation, can solve the problems of temperature sensitivity without temperature switch, limited application range, etc., and achieve no risk of secondary pollution , Excellent flocculation ability, enhanced bridging flocculation effect

Active Publication Date: 2019-03-19
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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  • A kind of temperature sensitive chitosan flocculant and its preparation method and application
  • A kind of temperature sensitive chitosan flocculant and its preparation method and application
  • A kind of temperature sensitive chitosan flocculant and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene respectively (the molar ratio of acryloyl chloride, n-propylamine and triethylamine is 1:1.1:1.2) and set aside. At 4°C, the acryloyl chloride solution was slowly added dropwise to the mixed solution of n-propylamine and triethylamine (toluene as the solvent) while 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 formed precipitate to obtain a monomer (in toluene) solution. Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 20:1), place it in a round bottom flask, and stir to dissolve completely. The temperature was raised to 60° C., and nitrogen gas was passed through for 30 minutes to remove 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 is 1:2, tol...

Embodiment 2

[0057] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene respectively (the molar ratio of acryloyl chloride, n-propylamine and triethylamine is 1:1.2:2) and set aside. At 4° C., the acryloyl chloride solution was slowly added dropwise to a mixed solution of n-propylamine and triethylamine (toluene as a solvent) while stirring for 1 hour, and then the mixture was stirred at 30° C. for 12 hours. The reaction mixture was filtered to remove the formed precipitate to obtain a monomer (in toluene) solution. Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 18:1), place it in a round bottom flask, and stir to dissolve completely. The temperature was raised to 70°C, and nitrogen gas was passed through for 30 minutes to remove the oxygen in the solution. Add 2,2'-azoisobutyronitrile (the solvent is toluene, the molar mass ratio of 2,2'-azoisobutyronitrile to acryloyl chloride is 1:3, the solvent and 2,2'-azoisobutyro...

Embodiment 3

[0060] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene respectively (the molar ratio of acryloyl chloride, n-propylamine and triethylamine is 1:1.3:1.4) and set aside. At 4° C., the acryloyl chloride solution was slowly added dropwise to a mixed solution of n-propylamine and triethylamine (toluene as the solvent) while stirring for 1 hour, and then the mixture was stirred at 23° C. for 15 hours. The reaction mixture was filtered to remove the formed precipitate to obtain a monomer (in toluene) solution. Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 16:1), place it in a round-bottomed flask, stir and dissolve completely. The temperature was raised to 80°C, and nitrogen gas was passed through for 30 minutes to remove the oxygen in the solution. Add 2,2'-azoisobutyronitrile (the solvent is toluene, the molar mass ratio of 2,2'-azoisobutyronitrile to acryloyl chloride is 1:4, the 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 polymer compounds, and more specifically relates to a temperature-sensitive chitosan flocculant and its preparation method and application. Background technique [0002] Water is the source of life. Water is an essential element of 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 continues to grow. From 2001 to 2012, the total amount of wastewater discharge in my country increased from 43.3 billion tons in 2001 to 68.5 billion tons in 2012. The total amount of wastewater discharge increased by 25.2 billion tons, and an average of 2.1 billion tons of wastewater was discharged every year. The average annual compo...

Claims

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Application Information

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Patent Type & Authority Patents(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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