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通过壳聚糖(CTS)与2-氯乙醇形成羟乙基壳聚糖(HECS),然后与二甲基二烯丙基氯化铵(DMDAAC)反应合成羟乙基壳聚糖季铵盐(HEQCS).利用FTIR、1HNMR对HEQCS的结构进行表征.将HEQCS与配制的高岭土模拟废水进行絮凝实验,考察了pH、HEQCS投加量、阳离子度对絮凝效果的影响,得到最佳pH=4～6,HEQCS投加量为3～6 mg/L,阳离子度为58％～71％,此时,絮凝后上清液浊度去除率为98％以上,与聚丙烯酰胺(CPAM)、CTS相比,絮凝性能优异.“,”Hydroxyethyl chitosan (HECS) is synthesized by chitosan and 2-chloroethanol,and then HECS reacts with dimethyl diallyl ammonium chloride (DMDAAC) to synthesize hydroxyethyl chitosan quaternary ammonium salt (HEQCS).The structure of HEQCS is characterized by FTIR and 1HNMR.The flocculation experiments are performed through adding HEQCS into simulated kaolin wastewater.The effects of pH,dosage of prepared HEQCS and cationic degree on the flocculation efficiency are investigated.The optimum flocculation conditions are gained as follows:pH is between 4 and 6,the dosage of HEQCS is in the range of 3-6 mg·L-1 and the cationic degree ranges from 58％ and 71％.Under these conditions,the removal rate of turbidity in supernatant solution after flocculation can exceed 98％,exhibiting better flocculation performance compared with cationic polyacrylamide and chitosan.