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。
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.
论述了两步法合成环氧树脂的反应动力学。
The dynamics of two-step epoxy resin synthesis were discussed.
以苯酚为原料，复合金属离子为催化剂，研究用气相氧化合成苯醌，用铁粉还原苯醌制对苯二酚的两步法工艺，考察了氧化过程中的工艺条件对反应的影响。
The two-step process involving gas oxidation of phenol to benzoquinone with complex metal ions catalysts and reduction of benzoquinone to hydroquinone with iron powder was studied.
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