新型絮凝剂聚环氧氯丙烷胺的制备及应用

Synthesis and application of polyamine flocculants for dye wastewater treatment

以环氧氯丙烷和二甲胺为原料制得一系列有机阳离子型聚合物,考察交联剂(不同胺类)的添加量、种类和反应温度对产物黏度和阳离子度的影响,对聚合物产品结构进行FT-IR表征,并进行含油废水净化实验。结果表明,交联剂为质量分数3%的乙二胺,聚合温度65℃时,聚合物黏度为1 102 m Pa·s,阳离子度为5.9 mmol/g,但其絮凝效果不理想;交联剂为质量分数2.5%三乙烯四胺,聚合温度65℃时,聚合物黏度为6 020 m Pa·s,阳离子度为3.6 mmol/g,其絮凝效果最好。不同胺类比较可知,净水效果受聚合物黏度影响较大。选用三乙烯四胺为交联剂的聚环氧氯丙烷胺与PAC复配对炼油厂含油废水的去油率达85.8%。

Polyamine flocculants are synthesized by polycondensation of dimethylamine and epichlorohydrin with amine as modifying agent. The influences of the amount of the amine, amine structures and the reaction temperature on the viscosity and cationic degree of polyamine flocculants are investigated. Infrared spectroscopy is used to character the structure of polyamine flocculants. The results show that the flocculation effect for oil bearing wastewater is greatly affected by the viscosity of the polymers. When the condensation temperature is 65℃ and 3% of 1,2-diaminoethane is used as crosslinking agent, the viscosity and cationic degree of the obtained polyamine are 1 102 mPa.s and 5.9 mmol/ g, respectively ,which results in unideal flocculation effect. By contrast,using 2. 5% of 3,4-diaminoethane as crosslinking agent, the obtained polyamine has improved viscosity （6 020 mPa·s） and its cationic degree is 3.6 mmol·g-1. The best flocculation effect can be achieved. The oil removal rate of this polyamine can reach 85.8% by combining with PAC.