Hydrophobic modified chitosan flocculant as well as preparation method and application thereof

A hydrophobic modification, chitosan technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. problem, to achieve excellent flocculation performance, safe secondary pollution risk, strong effect

Active Publication Date: 2018-08-03
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that traditional flocculants cannot remove hydrophobic pollutants in water well, and the dosage is large, and the scope of application is limited, the present invention designs a hydrophobic modified chitosan flocculant and its preparation method and application

Method used

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  • Hydrophobic modified chitosan flocculant as well as preparation method and application thereof
  • Hydrophobic modified chitosan flocculant as well as preparation method and application thereof
  • Hydrophobic modified chitosan flocculant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dissolve acryloyl chloride in toluene (the molar ratio of acryloyl chloride to toluene is 1:10) and set aside. In; 4 o C, while stirring, add the acryloyl chloride solution dropwise to the mixed solution of piperidine and triethylamine (the solvent of the mixed solution is toluene), the dropping rate is 1 drop / second, in which acryloyl chloride, piperidine and triethylamine The molar ratio of ethylamine is 1:1:10, and then the mixture is o C under magnetic stirring reaction for 24 hours. The reaction mixture was filtered to remove the generated precipitate to obtain a toluene solution containing acryloylpiperidine.

[0047] Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 40:1), place it in a round bottom flask, and stir to dissolve completely. warm up to 60 o C. Nitrogen gas was blown for 30 minutes to remove the oxygen in the solution. Add 2,2'-azobisisobutyronitrile toluene solution (the molar ratio of 2,2'-azo...

Embodiment 2

[0051] Dissolve acryloyl chloride, piperidine and triethylamine in toluene respectively (the molar ratio of acryloyl chloride to toluene is 1:14) and set aside. at 5 o C, while stirring, add the acryloyl chloride solution dropwise to the mixed solution of piperidine and triethylamine (solvent is toluene), the dropping rate is 1 drop / second, the moles of acryloyl chloride, piperidine and triethylamine The ratio is 1:2:13, and the mixture is then mixed at 10 o C under magnetic stirring reaction for 30 hours. The reaction mixture was filtered to remove the formed precipitate to obtain a toluene solution of acryloylpiperidine.

[0052] Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 15:1), place it in a round-bottomed flask, stir and dissolve completely. warm up to 60 o C. Nitrogen gas was passed through for 30 minutes to remove the oxygen in the solution. Add a toluene solution of 2,2'-azobisisobutyronitrile (the molar rati...

Embodiment 3

[0056] Dissolve acryloyl chloride, piperidine and triethylamine in toluene respectively (the molar ratio of acryloyl chloride to toluene is 1:15, and the molar ratio of acryloyl chloride, piperidine and triethylamine is 1:3:16), and wait for use. at 2 o C, while stirring, add the acryloyl chloride solution dropwise to the mixed solution of piperidine and triethylamine (solvent is toluene), the dropping rate is 1 drop / second, and then the mixture is added at 25 o C under magnetic stirring reaction for 12 hours. The reaction mixture was filtered to remove the formed precipitate to obtain a toluene solution of acryloylpiperidine.

[0057] Dissolve thioglycolic acid in toluene (the molar ratio of acryloyl chloride to thioglycolic acid is 25:1), put it in a round bottom flask, and stir to dissolve completely. warm up to 40 o C. Nitrogen gas was passed through for 30 minutes to remove the oxygen in the solution. Add a toluene solution of 2,2'-azobisisobutyronitrile (the molar ...

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Abstract

The invention provides a hydrophobic modified chitosan flocculant as well as a preparation method and an application thereof. The chitosan flocculant has the structure shown in the structural formula.The flocculant has proper hydrophobicity and can better interact with hydrophobic pollutants in water; by means of a graft modification method, the number and molecular weight of functional groups are increased, the flocculating performance is enhanced, and the flocculant has very excellent flocculating performance for hydrophobic pollutants in water. The preparation method of the hydrophobic modified chitosan flocculant is simple to operate and short in synthesis time, widely sourced biomass products are used as main materials, and the method is low in cost and suitable for large-scale industrial production and is an economical preparation method for obtaining high-quality water treating agents.

Description

technical field [0001] The invention belongs to the field of polymer compounds, and more specifically relates to a hydrophobically modified chitosan flocculant and its preparation method and application. Background technique [0002] In recent years, with the enhancement of people's environmental awareness and the implementation of my country's sustainable development strategy, the work of preventing pollution and protecting the environment has attracted great attention from governments at all levels. From a global perspective, the contradictions between water resources and water environment are becoming more and more prominent. China has a large population base and lacks water resources. The per capita water volume is only 2630 m 3 , which is 1 / 4 of the world's per capita water volume. With the surge in population and the development of modern industry and agriculture, water consumption has increased dramatically this year. Especially the development of industry requires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C02F1/56
CPCC02F1/5263C02F1/56C08G81/02
Inventor 杨朕杜红薇杨维本沈世超耿星月
Owner NANJING NORMAL UNIVERSITY
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