陈光敏,孙永杰,陈鹏飞,刘定华,刘晓勤

• 1:南京工业大学化工学院

摘要(Abstract)：

针对分子筛吸附分离间/对甲酚异构体体系，筛选出分离系数较高的硅铝比为50的NaZSM-5分子筛，以不同浓度NaOH溶液作为碱处理试剂，成功制备出一系列具有多级孔结构的改性ZSM-5分子筛，并利用N_2吸附-脱附、X射线衍射表征（XRD）等手段对吸附剂进行了表征。通过静态和动态吸附实验，考察了改性ZSM-5分子筛吸附剂对间/对甲酚异构体的吸附分离性能，并探究了该过程的动力学原理。结果表明，以0.2 mol·L~(-1)NaOH溶液85℃下碱处理1 h得到的0.2-85-1分子筛成功引入了介孔，其存在增强了传质性能，从而提高了吸附速率，相较于处理前的分子筛样品，改性后的0.2-85-1分子筛对甲酚吸附平衡时间缩短了50%，最大处理量提升了50%(303 kg·m~(-3)·d~(-1)提升至454 kg·m~(-3)·d~(-1))。结合动力学拟合结果分析，间/对甲酚在0.2-85-1分子筛上的吸附行为符合拟二级动力学模型，速率常数相较于改性前样品提升了一个数量级。

关键词(KeyWords)： ZSM-5分子筛;碱处理;甲酚异构体;吸附;动力学

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 陈光敏,孙永杰,陈鹏飞,刘定华,刘晓勤

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