Flocculating agent and preparation method thereof

A flocculant and initiator technology, used in the field of flocculants and their preparation, can solve the problems of reducing the hydrodynamic volume of organic polymer flocculants, changing the structure of polymer chains, affecting the flocculation effect, etc., and achieves excellent flocculation effect, enhanced Anti-salt ability, improve the effect of flocculation

Inactive Publication Date: 2014-05-21
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the vast majority of organic polymer flocculants are anionic or cationic polyelectrolytes, and the electrostatic interaction between molecules changes the polymer chain structure, thereby affecting the flocculation effect
Moreover, with the addition of small molecule electrolytes, the organic polymer flocculation with a single charge shields the electrostatic interaction between the same charges, thereby reducing the hydrodynamic volume of the organic polymer flocculant, resulting in a decrease in the flocculation ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The embodiment of the present invention discloses a preparation method of a flocculant, comprising the following steps:

[0022] a) dissolving acrylamide, acrylic acid and methacryloxyethyl dimethyl benzyl ammonium chloride in water to obtain a mixed solution;

[0023] The molar ratio of the acrylic acid to methacryloxyethyl dimethyl benzyl ammonium chloride is 1: 0.5~1.5;

[0024] b) In an inert gas environment, the mixed solution in step a) undergoes a polymerization reaction under the action of an initiator to obtain a flocculant.

[0025] The present invention uses acrylamide, acrylic acid and methacryloxyethyl dimethyl benzyl ammonium chloride as raw materials, and in step a), acrylamide, acrylic acid and methacryloxyethyl dimethyl benzyl chloride are The ammonium is dissolved in water to obtain a mixed solution; the molar ratio of the acrylic acid to methacryloxyethyl dimethyl benzyl ammonium chloride is 1:0.5-1.5, preferably 1:1. The ratio of the total amount o...

Embodiment 1

[0035] Into a four-neck reaction flask with condensed water, mechanical stirrer, nitrogen inlet and dropping funnel, add 0.18mol acrylamide, 0.01mol acrylic acid and 0.01mol methacryloxyethyl dimethyl benzyl ammonium chloride Dissolve in 303.62mL deionized water to obtain a mixed solution. NaOH solution with a mass concentration of 20 wt% was added dropwise to the mixed solution to adjust the pH value of the mixed solution to 8.0.

[0036] Nitrogen gas was blown into the mixed solution for 30 minutes, the temperature was raised to 30° C., 0.0002 mol of azobisisobutylimidazoline hydrochloride was added, and the reaction was carried out for 24 hours to obtain the product. The product is dialyzed and precipitated with acetone to obtain a flocculant.

[0037] The flocculation performance test was carried out on the obtained flocculant, and the results showed that:

[0038] The montmorillonite suspension with a mass fraction of 1% has a turbidity of 2000, adding 150ppm flocculant...

Embodiment 2

[0043] Into a four-neck reaction flask with condensed water, mechanical stirrer, nitrogen inlet and dropping funnel, add 0.038mol acrylamide, 0.001mol acrylic acid and 0.001mol methacryloxyethyl dimethyl benzyl ammonium chloride Dissolve in 97.58mL deionized water to obtain a mixed solution. NaOH solution with a mass concentration of 20 wt% was added dropwise to the mixed solution to adjust the pH value of the mixed solution to 7.0.

[0044] Nitrogen gas was blown into the mixed solution for 30 minutes, the temperature was raised to 50° C., 0.00002 mol of azobisisobutylimidazoline hydrochloride was added, and the reaction was carried out for 12 hours to obtain the product. The product is dialyzed and precipitated with acetone to obtain a flocculant.

[0045] The flocculation performance test was carried out on the obtained flocculant, and the results showed that:

[0046] The montmorillonite suspension with a mass fraction of 1% has a turbidity of 2000, adding 150ppm flocculan...

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PUM

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Abstract

The invention provides a preparation method of flocculating agent. The method comprises the steps as follows: acrylamide, acrylic acid, and methyl propene acyl-oxygen ethyl dimethyl benzyl ammonium chloride are dissolved in water so as to obtain mixed solution; the molar ratio of the acrylic acid to the methyl propene acyl-oxygen ethyl dimethyl benzyl ammonium chloride is 1 to (0.5-1.5); and in an inert gas environment, the mixed solution is subjected to polyreaction under the effect of initiating agent, so that the flocculating agent is obtained. In the invention, the contents of positive charge and negative charge in the obtained flocculating agent are the same, the quality of the solution shows an antipolyelectrolyte effect, the performance of the solution cannot change acutely with the increasing of external salt concentration, and the flocculation effect is excellent. Meanwhile, the hydrophobic group carried by the flocculating agent forms physical crosslinking, so that the salt resisting capability of the flocculating agent is enhanced. Therefore, the flocculating effect is improved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a flocculant and a preparation method thereof. Background technique [0002] Wastewater is a complex mixed dispersion system composed of water and various impurities. Among them, the most common is saline wastewater. In the production process of metallurgy, chemical industry, steel, electronic etching, printing and dyeing, food, pharmaceutical, textile, chemical industry, wastewater concentration, product processing and other industries, a large amount of high-concentration saline wastewater is discharged, and some of the concentration of saline wastewater As high as 10% to 25%. In addition to high concentrations of salt, saline wastewater also contains a large amount of toxic and refractory organic matter. The large amount of discharge directly leads to the increase of the salinity of river water, which brings more and more serious pollution to soil, surface water and groundwate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/34C02F1/56
Inventor 安会勇张文德洪博李文波路璀阁王丕新
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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