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Preparation method of recyclable flocculating agent

A flocculant and a certain amount of technology, applied in the field of the preparation of recyclable flocculants, can solve the problems that the electrolysis effect is not as good as that of inorganic flocculants, the hydrolysis reaction is unstable, and the bridging ability is poor, so as to improve the flocculation effect and the flocculation ability. , Improve the effect of flocculation ability

Active Publication Date: 2021-03-16
SHANGHAI SHANHENG ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, the prior art also discloses the method of using different types of flocculants to treat cyanobacteria water bodies. For example, materials such as aluminum sulfate, aluminum chloride, and ferric sulfate can be used as inorganic flocculants, but their bridging ability is extremely poor, and hydrolysis The reaction is very unstable, and it is easy to cause secondary pollution; starch, cellulose, polysaccharides and proteins can be used as organic flocculants, but their electrolytic effect is not as good as that of inorganic flocculants, which takes a long time and is difficult to recycle

Method used

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preparation example Construction

[0033] One aspect of the present invention provides a method for preparing a recyclable flocculant, comprising the following steps:

[0034] Step 1, pretreatment stage: Weigh a certain amount of hydroxypropyl cellulose, N-succinyl chitosan, N-methoxy-N-methylacetamide, put the three in a flask, and add acetic acid solution, stirring, and mixing uniformly to obtain a mixed solution; the weight ratio of the hydroxypropyl cellulose, N-succinyl chitosan, and N-methoxyl-N-methylacetamide is 5:2-3:0.5 -0.8;

[0035] Step 2, add composite initiator in the flask of described step 1, and feed nitrogen, stir and mix;

[0036] Step 3, add a certain amount of glycidyl methacrylate and acrylic acid to the mixture in step 2, raise the temperature, react for a certain period of time, add sodium hydroxide aqueous solution to neutralize after cooling, and obtain a precipitate;

[0037] Step 4, washing the precipitate in step 3 with water and ethanol successively, and drying in vacuo to obtai...

Embodiment 1

[0048] A preparation method of recyclable flocculant, comprising the following steps:

[0049] Step 1, pretreatment stage: weigh hydroxypropyl cellulose, N-succinyl chitosan, N-methoxy-N-methylacetamide, place the three in a flask, and add 10% by mass % acetic acid solution, stirred, and mixed uniformly to obtain a mixed solution; wherein the weight ratio of hydroxypropyl cellulose, N-succinyl chitosan, and N-methoxyl-N-methylacetamide is 5:3:0.6 ;

[0050] Step 2, add sodium persulfate and ammonium persulfate to the flask of step 1, and feed nitrogen, stir and mix uniformly; wherein the total weight of sodium persulfate and ammonium persulfate is the same as that of the hydroxypropyl cellulose, N -The total weight ratio of succinyl chitosan and N-methoxy-N-methylacetamide is 1:30, wherein the weight ratio of sodium persulfate and ammonium persulfate is 2:1;

[0051] Step 3, add glycidyl methacrylate and acrylic acid to the mixture in step 2, raise the temperature, react for...

Embodiment 2

[0056] A preparation method of recyclable flocculant, comprising the following steps:

[0057] Step 1, pretreatment stage: weigh hydroxypropyl cellulose, N-succinyl chitosan, N-methoxy-N-methylacetamide, place the three in a flask, and add 10% by mass % acetic acid solution, stirred, and mixed uniformly to obtain a mixed solution; wherein the weight ratio of hydroxypropyl cellulose, N-succinyl chitosan, and N-methoxy-N-methylacetamide is 5:3:0.8 ;

[0058] Step 2, add sodium persulfate and ammonium persulfate to the flask of step 1, and feed nitrogen, stir and mix uniformly; wherein the total weight of sodium persulfate and ammonium persulfate is the same as that of the hydroxypropyl cellulose, N -The total weight ratio of succinyl chitosan and N-methoxy-N-methylacetamide is 1:35, wherein the weight ratio of sodium persulfate and ammonium persulfate is 2:1;

[0059] Step 3, add glycidyl methacrylate and acrylic acid to the mixture in step 2, raise the temperature, react for ...

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PUM

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Abstract

The invention discloses a preparation method of a recyclable flocculant, and the method comprises the following steps: selecting an ethylene vinyl acetate copolymer with VA content of 5-8% as a structural matrix of the flocculant, carrying out graft modification on hydroxy propyl cellulose and N-succinyl chitosan by glycidyl methacrylate and acrylic acid to obtain the recyclable flocculant, adopting N-methoxy-N-methyl acetamide as a structure modifier, and adopting a foaming process to prepare the recyclable flocculant. The flocculant prepared by the invention overcomes the problems of insufficient flocculation capacity and difficulty in recovery treatment of the existing flocculant, shows higher flocculation capacity, can be recovered, avoids secondary pollution, and can be widely used inthe treatment process of blue-green algae water.

Description

technical field [0001] The invention relates to the technical field of cyanobacteria treatment, in particular to a preparation method of a recyclable flocculant. Background technique [0002] In people's daily life and national economic development, water resources occupy an important position. With the continuous development of the country's economic level, the urbanization process is accelerating, and the demand for water resources in all walks of life is increasing day by day. However, a large amount of environmental sewage is produced at the same time as the development. At the same time, the sewage contains more and more nutrients. It directly leads to the rapid reproduction and growth of algae in the water body, seriously affecting the development of aquaculture, tourism, water supply and other aspects. [0003] The prior art has disclosed some cyanobacteria water treatment methods. For example, the prior art uses the method of adding activated carbon to the sewage, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L51/02C08K5/20C08J9/10C08F251/00C08F251/02C08F220/06C08F220/32C02F1/56
CPCC02F1/56C08F251/00C08F251/02C08J9/0028C08J9/0061C08J9/103C08J2203/04C08J2323/08C08J2451/02C08F220/06C08F220/325
Inventor 黄海弟王艳云赵金涛
Owner SHANGHAI SHANHENG ECOLOGICAL TECH CO LTD
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