Adsorbing precipitant of anionic dye, its synthetic process and uses

Abstract

This invention is concerned with a kind of anionic dye absorption precipitant, its synthesis method and application. Epoxy resin is polymerized with ethylenediamine and epichlorohydrine to produce hydrophobic section-containing polyamine molecules. Polyamine is quaternized with benzyl chloride, dimethyl sulphate to produce polycation. The polycation with anionic dye forms insoluble stable complex and the dye sewage is thus purified by precipitation. As exists strong aromatic hydrophobic sections and groups in the polycation, it is self-emulsified in water to form stable emulsion or microemulsion which performs stronger absorption to anions compard to ordinary cations. Therefore, over 95% anionic dye can be removed from dye sewage with this polycation and it has the advantages of outstanding effect, convenient employment and no second pollution.

Description

technical field [0001] The present invention relates to a new type of polymer quaternary ammonium salt, its synthesis method and its application in the treatment of dye wastewater. Using the cationic polymer can provide a method for removing water-soluble anionic dyes which is convenient, quick and effective . Background technique [0002] Dye wastewater mainly comes from the production industry of dyes and dye intermediates. It is composed of the mother liquor of crystallization of various products and intermediates, materials lost during the production process, and sewage from washing the ground. Due to the variety of dyes produced and the development in the direction of anti-photolysis, anti-oxidation, and anti-biological oxidation, it is more difficult to treat dye wastewater. Difficulties in the treatment of dye wastewater: First, the high COD, while the BOD / COD value is small, and the biodegradability is poor; second, the chroma is high and the components are complex....

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Problems solved by technology

[0003] The biodegradation method has a long period and is also restricted by the biodegradability of the dye. The salt in the wastewater will also inhibit the bacteria, which limits the efficiency of the microorganisms. Therefore, the COD removal rate of the biological treatment method is not high.

In terms of decolorization, the biological treatment method has a certain decolorization effect on basic dyes and dye wastewater containing anthraquinone structural chromogenic groups, but generally speaking, the decolorization rate is not high, about 50%; chemical oxidation method is the dye wastewater The main method of decolorization is to use oxidants such as ozone, chlorine and its oxygen-containing compounds to oxidize and destroy the chromophoric group of the dye to decolorize. Combined oxidation and catalytic oxidation are often used, but the processing cost is high and there are special requirements for equipment; chemical The flocculation precipitation method has the advantages of short processing time, low processing cost, and simple equipment, but the coagulation and decolorization efficiency of water-soluble anionic dyes is poor, and cationic coagulants such as dodecyl dimethyl benzyl chloride are required. Ammonium, first form a complex, and then coagulate with aluminum sulfate or PAC to have a decolorization effect, but its treatment effect is restricted by the water solubility of the coagulant, the removal effect of the dye is not good, and the purpose of completely removing the dye cannot be achieved

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