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Temperature-sensitivity chitosan flocculating agent, preparation method and application thereof

A chitosan, sensitive technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc. Achieve excellent flocculation ability, wide application range, and enhance the effect of flocculation performance

Active Publication Date: 2016-11-09
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems that the traditional flocculant cannot combine hydrophilic and hydrophobic pollutants at the same time, does not have the temperature sensitivity of the temperature switch near normal temperature, and has limited application range, etc., the present invention provides a kind of flocculation switch with a temperature switch at about 25°C. Temperature sensitive chitosan flocculant and its preparation method and application

Method used

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  • Temperature-sensitivity chitosan flocculating agent, preparation method and application thereof
  • Temperature-sensitivity chitosan flocculating agent, preparation method and application thereof
  • Temperature-sensitivity chitosan flocculating agent, preparation method and application thereof

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Embodiment 1

[0059] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene to prepare acryloyl chloride solution and a mixed solution of n-propylamine and triethylamine respectively (the molar ratio of acryloyl chloride, n-propylamine, triethylamine and toluene is 1:1.1 :1.2:10), for use. At 4°C, slowly add acryloyl chloride solution dropwise (drop rate: 1 drop / s) to the mixed solution of n-propylamine and triethylamine while stirring, dropwise for 1 hour, and then continue the mixture at 25°C. The reaction was stirred 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 (the solve...

Embodiment 2

[0064] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene to prepare acryloyl chloride solution and a mixed solution of n-propylamine and triethylamine respectively (the molar ratio of acryloyl chloride, n-propylamine, triethylamine and toluene is 1:1 :5:10), for use. At 4° C., the acryloyl chloride solution was slowly added dropwise to the mixed solution of n-propylamine and triethylamine while stirring for 1 hour, and then the mixture was continuously stirred at 30° C. for 40 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 38:1), place it in a round-bottomed flask, stir and 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 diethyl ether, the molar r...

Embodiment 3

[0069] Dissolve acryloyl chloride, n-propylamine and triethylamine in toluene to prepare acryloyl chloride solution and a mixed solution of n-propylamine and triethylamine (the molar ratio of acryloyl chloride, n-propylamine, triethylamine and toluene is 1:5 :1:10), for use. At 0°C, the acryloyl chloride solution was slowly added dropwise to the mixed solution of n-propylamine and triethylamine while stirring for 1 hour, and then the mixture was continuously stirred at 25°C for 30 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 8:1), place it in a round-bottomed flask, stir and dissolve completely. The temperature was raised to 85° C., and nitrogen gas was passed through for 30 minutes to remove oxygen in the solution. Add 2,2'-azoisobutyronitrile (the solvent is toluene, the molar ratio of 2,2'-azoisobutyron...

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Abstract

The invention discloses a temperature-sensitivity chitosan flocculating agent, a preparation method and an application thereof. The temperature sensitivity chitosan flocculating agent has a structure shown as a following formula in a specification, wherein a average value range of n is 0.47-19.47, unamidated and amidated chitosan repeating units are irregularly arranged, and the ratio scope of a to b is 0.042-0.99. According to the invention, a temperature sensitive monomer is polymerized, chitosan molecules are introduced to obtain the temperature sensitivity chitosan flocculating agent, temperature is switched to about 25 DEG C; through a method of first polymerization and second grafting modification, function group number and molecular weight are increased, bridge formation flocculation effect is enhanced, flocculation removal requirement of a pollutant in polluted water body at the temperature of about 25 DEG C can be satisfied, a poly-n-propyl acrylamide grafted chain can generate hydrophility or hydrophobicity by following with the temperature change, and the chitosan flocculating agent has excellent flocculation capability on the pollutant with easy transition of hydrophility / hydrophobicity in water body.

Description

technical field [0001] The invention belongs to the field of polymer compounds, and relates to a polymer flocculant, more specifically, 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...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F120/54C02F1/56C02F101/20C02F101/30
CPCC02F1/56C08F120/54C08G81/02C02F2101/30C02F2101/20
Inventor 杨朕任可馨杨维本沈佳淳张讯通
Owner NANJING NORMAL UNIVERSITY
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