Cationic polyacrylamide (CPAM) flocculants, which are applied more and more widely in wastewater treatment, has been obtained usually by the Mannich reaction in a two-step way.

• 摘要阳离子型聚丙烯酰胺絮凝剂在污水处理方面发挥的作用越来越大，阳离子聚丙烯酰胺往往通过曼尼奇反应以两步法获得。