Preparation method of hydrophobic chitosan-based flocculating agent

A technology of chitosan and flocculants, which is applied in the field of preparation of hydrophobic chitosan-based flocculants, can solve the problems of poor settling performance of flocculants and unsatisfactory treatment effects, and achieve good social and economic benefits, Enhanced water treatment performance, easy-to-control effects

Inactive Publication Date: 2019-08-16
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of mild reaction conditions and less energy consumption, but the flocculant settling performance is not good, resulting in unsatisfactory treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare the hydrophobic chitosan-based flocculant in the following manner:

[0028] 1) Weigh a certain amount of chitosan and place it in pure water, stir until the chitosan is evenly dispersed, then slowly add glacial acetic acid dropwise into the reactor and continue to stir rapidly, controlling the mass ratio of chitosan to glacial acetic acid to be 2 : 1; after the chitosan is completely dissolved, a chitosan solution with a concentration of 4% is obtained.

[0029] 2) Add AM and valencene monomer into the reactor at a ratio of 3~6:1 and continue to stir until the two are completely dissolved, and control the concentration of chitosan, AM and valencene in pure water. The total mass fraction is 35%.

[0030] 3) Place the reactor under a low-pressure microwave-induced plasma with nitrogen addition for plasma functionalization. The functionalization time is 60s.

[0031] 4) Place the reactor in the center of the electrode of the plasma reactor, start the radio frequ...

Embodiment 2

[0034] Prepare the hydrophobic chitosan-based flocculant in the following manner:

[0035] 1) Weigh a certain amount of chitosan and place it in pure water, stir until the chitosan is evenly dispersed, then slowly add glacial acetic acid dropwise into the reactor and continue to stir rapidly to control the mass ratio of chitosan to glacial acetic acid to 1.5 : 1; after the chitosan was completely dissolved, a chitosan solution with a concentration of 3.5% was obtained.

[0036] 2) Add AM and valencene monomer into the reactor at a ratio of 6:1 and continue to stir until the two are completely dissolved, and control the total mass of chitosan, AM and valencene in pure water The score is 30%.

[0037] 3) Place the reactor under a low-pressure microwave-induced plasma with nitrogen addition for plasma functionalization. The functionalization time was 40s.

[0038] 4) Place the reactor in the center of the electrode of the plasma reactor, start the radio frequency generator und...

Embodiment 3

[0041] Prepare the hydrophobic chitosan-based flocculant in the following manner:

[0042]1) Weigh a certain amount of chitosan and place it in pure water, stir until the chitosan is evenly dispersed, then slowly add glacial acetic acid dropwise into the reactor and continue to stir rapidly, controlling the mass ratio of chitosan to glacial acetic acid to be 2 : 1; after the chitosan was completely dissolved, a chitosan solution with a concentration of 3.5% was obtained.

[0043] 2) Add AM and valencene monomer into the reactor at a ratio of 6:1 and continue to stir until the two are completely dissolved, and control the total mass of chitosan, AM and valencene in pure water The score is 30%.

[0044] 3) Place the reactor under a low-pressure microwave-induced plasma with nitrogen addition for plasma functionalization. The functionalization time was 40s.

[0045] 4) Place the reactor in the center of the electrode of the plasma reactor, start the radio frequency generator u...

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PUM

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Abstract

The invention discloses a preparation method of a hydrophobic chitosan-based flocculating agent. The method, adopting chitosan, acrylamide (AM) and valencene as raw materials, comprises the followingsteps: sequentially adding the chitosan, acrylamide, and valencene into a reactor, adding an appropriate amount of water, and performing sufficient uniform mixing under a rapid stirring condition in order to achieve complete dissolving; placing a reactor, introducing nitrogen, and performing plasma functionalization under the action of low-pressure microwave-induced plasma; placing the reactor ina plasma reaction instrument, and turning on a radiofrequency generator to initiate a polymerization reaction; and performing discharging, performing stirring at a proper post-polymerization temperature for a certain period of time to obtain a mixture, and purifying the obtained product to obtain the hydrophobic chitosan-based flocculating agent. The preparation method has the advantages of stablereaction, easiness in control, and no addition of an initiator, and the obtained chitosan-based flocculating agent has a good solubility, is pure, has high hydrophobic association due to the introduction of a hydrophobic groups, is in favor of settling flocs during flocculation, and is an efficient water treatment flocculating agent.

Description

technical field [0001] The invention belongs to the technical field of flocculants, and in particular relates to a preparation method of a hydrophobic chitosan-based flocculant. Background technique [0002] Coagulation is widely used in water treatment because of its simplicity, cost-effectiveness and high efficiency. In the coagulation experiment, the main role is the flocculant, which mainly plays the role of adsorption, electric neutralization, compression of the double layer, adsorption bridging, and net capture in the water treatment process, so that the colloids that are difficult to settle and remove in the water body Pollution such as particles, heavy metal ions, and natural organic matter are better removed. Flocculants mainly include inorganic flocculants, organic polymer flocculants, natural organic polymer flocculants and microbial flocculants. Among them, the natural organic polymer flocculant is a kind of organic polymer flocculant prepared by chemically mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F2/52C02F1/56
CPCC02F1/56C08F2/52C08F251/00C08F220/56
Inventor 唐晓旻郑洁张世欣王韬王维
Owner CHONGQING TECH & BUSINESS UNIV
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