Flocculating agent and preparation method thereof

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...

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