Preparation method of temperature-responsive hyperbranched block flocculant

A temperature-responsive flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, can solve the problems of chitosan flocculant structure and performance impact, complex preparation process, etc., and achieve good social and economic benefits, preparation Simple method, good economic and social benefits

Inactive Publication Date: 2022-07-01
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the flocculant material contains a large number of active amine groups and imino groups, which can be protonated or deprotonated to change the positive charge density on the surface, realize the adsorption of negatively charged pollutants, and achieve efficient flocculation. The preparation process is relatively complicated, and the mixing reaction needs to be stirred and mixed at 70~80°C during the preparation process. High temperature may affect the structure and performance of chitosan flocculant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add acryloyloxyethyltrimethylammonium chloride and N-isopropylacrylamide monomers into distilled water at a mass ratio of 2:1 and continue stirring until the two are completely dissolved, and control the acryloyloxyethyl The total mass fraction of trimethylammonium chloride and N-isopropylacrylamide in distilled water is 20%.

[0028]2) Add ethyl orthosilicate, and its mass fraction in the reaction solution is 3.0%.

[0029] 3) Add pentaerythritol, and its mass fraction in the reaction solution is 0.02%.

[0030] 4) Add urea, and its mass fraction in the reaction solution is 2%.

[0031] 5) Add 0.02% mass fraction of photoinitiator azobisisobutylimidazoline hydrochloride during the process of nitrogen flushing.

[0032] 6) Finally, put the reactor in the UV light intensity range of 0.08W / cm 2 The reaction was carried out under the irradiation of a low-pressure ultraviolet mercury lamp for 4 hours, and after the reaction was completed, the product was purified by c...

Embodiment 2

[0034] 1) Add acryloyloxyethyltrimethylammonium chloride and N-isopropylacrylamide monomers into distilled water at a mass ratio of 3:1 and continue stirring until the two are completely dissolved, and control the acryloyloxyethyl The total mass fraction of trimethylammonium chloride and N-isopropylacrylamide in distilled water is 25%.

[0035] 2) Add ethyl orthosilicate, and its mass fraction in the reaction solution is 3.5%.

[0036] 3) Add pentaerythritol, and its mass fraction in the reaction solution is 0.03%.

[0037] 4) Add urea, and its mass fraction in the reaction solution is 2.5%.

[0038] 5) Add 0.25% mass fraction of photoinitiator azobisisobutylimidazoline hydrochloride in the process of nitrogen flushing.

[0039] 6) Finally, put the reactor in the UV light intensity range of 0.12W / cm 2 The reaction was carried out under the irradiation of a low-pressure ultraviolet mercury lamp for 4.5 hours, and after the reaction was completed, the product was purified by ...

Embodiment 3

[0041] 1) Add acryloyloxyethyltrimethylammonium chloride and N-isopropylacrylamide monomers into distilled water at a mass ratio of 4:1 and continue stirring until the two are completely dissolved. Control the acryloyloxyethyl The total mass fraction of trimethylammonium chloride and N-isopropylacrylamide in distilled water is 30%.

[0042] 2) Add ethyl orthosilicate, and its mass fraction in the reaction solution is 4.0%.

[0043] 3) Add pentaerythritol, and its mass fraction in the reaction solution is 0.04%.

[0044] 4) Add urea, and its mass fraction in the reaction solution is 3%.

[0045] 5) Add 0.03% photoinitiator azobisisobutylimidazoline hydrochloride in the process of purging nitrogen and displacing oxygen.

[0046] 6) Finally, put the reactor in the UV light intensity range of 0.15W / cm 2 The reaction is carried out under the irradiation of a low-pressure ultraviolet mercury lamp for 5 hours, and after the reaction is completed, the product is purified by curing ...

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PUM

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Abstract

The invention discloses a preparation method of a temperature-responsive hyperbranched block flocculating agent. According to the method, pentaerythritol is used as a branching agent, N-isopropylacrylamide is used as a temperature-sensitive monomer, acryloyloxyethyl trimethyl ammonium chloride is used as a cationic monomer, and sodium polyacrylate is used as a template; the preparation method comprises the following steps: firstly, respectively adding N-isopropylacrylamide and acryloyloxyethyl trimethyl ammonium chloride into a reactor, adding a proper amount of distilled water, and stirring; after the monomers are completely dissolved, adding sodium polyacrylate, urea, pentaerythritol and tetraethoxysilane, and fully and uniformly mixing and completely dissolving under the condition of rapid stirring; adding a photoinitiator, namely, azobis (2-isobutylimidazoline) hydrochloride; introducing nitrogen into the reactor to remove oxygen; and finally, placing the reactor under the irradiation of a low-pressure ultraviolet mercury lamp to react for 4-6 hours. And after the reaction is finished, curing, and extracting and purifying a product, so as to obtain the temperature-responsive hyperbranched block flocculant. The reaction is stable, control is easy, side reactions are few, the obtained temperature-responsive hyperbranched block flocculant is good in dissolvability and pure in product, due to introduction of the temperature-responsive material, the settling speed of flocs in the flocculation process is increased, and the temperature-responsive hyperbranched block flocculant is an efficient water treatment flocculant.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a preparation method of a temperature-responsive hyperbranched block flocculant. Background technique [0002] With the rapid growth of population and the development of industrial economy, the shortage of water resources and water pollution caused by the problems have received widespread attention from the society. The importance of water resources issues and the necessity of water treatment are becoming increasingly prominent. There are many methods for wastewater treatment. Compared with other water treatment methods such as biological, chemical oxidation, ion exchange, electrolysis, electrodialysis, coagulation, because of its Easy to operate, cost-effective and widely used, especially in drinking water treatment, coagulation is also essential as a pretreatment. In the process of water treatment, coagulation mainly removes the suspended colloidal particles in the water b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/02C02F1/56
CPCC08F297/026C02F1/56
Inventor 樊伟唐晓旻
Owner CHONGQING TECH & BUSINESS UNIV
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