乙撑胺开环聚合制得聚乙撑胺，它的阳离子电荷密度高，对金属离子有络合性，因而具有选择性的絮凝作用，作为有机废水处理的助凝，对于提高处理水质十分有效。 Polyethyleneamines are obtained by the ring-opening polymerization of ethyleneamines, which have high cationic charge density and complexation with metal ions and thus have selective flocculation. As a coagulant for organic wastewater treatment, it is very effective for improving the quality of treated water .