UIO-66-NH_(2)金属-有机骨架材料吸附分离四甲苯异构体  

Adsorption and separation of tetramethylbenze isomers by metal-organic frameworks UIO-66-NH_(2)

作　　者：王天佑 毛星星 张义云 张艳[1] 吴艳阳[1] WANG Tian-you;MAO Xing-xing;ZHANG Yi-yun;ZHANG Yan;WU Yan-yang(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《高校化学工程学报》2022年第4期488-497,共10页Journal of Chemical Engineering of Chinese Universities

摘　　要：四甲苯是一类重要的有机化工原料,主要来源为C_(10)重芳烃,其中四甲苯同分异构体的分离是制约C_(10)重芳烃高效利用的关键之一,研究采用金属-有机骨架材料(MOFs)进行均四甲苯和连四甲苯的分离。采用溶剂热法制备了ZIF-8、UIO-66-NH_(2)和MIL-53(Cr)3种MOFs材料,确定UIO-66-NH_(2)为吸附剂。研究了四甲苯在UIO-66-NH_(2)的吸附动力学,采用准一级、准二级和颗粒内扩散动力学模型对实验数据进行拟合,其中准二级动力学模型关联结果较优。研究了四甲苯在UIO-66-NH_(2)的吸附热力学,选用Langmuir与Freundlich模型对实验数据进行拟合,其中Freundlich模型的关联结果较优。在此基础上,计算了吸附过程的吉布斯自由能、焓变和熵变,研究结果可为C_(10)重芳烃中四甲苯同分异构体吸附分离提供参考。Tetratoluene mainly from C_(10) heavy aromatics is an important organic chemical raw material.Separation of isomers is critical to high-efficient industrial utilization of C_(10) heavy aromatics.Metal organic frameworks(MOFs)were used as the adsorbents of tetratoluene isomers.ZIF-8,UIO-66-NH_(2) and MIL-53(Cr)MOFs were prepared and UIO-66-NH_(2) prepared by a solvothermal method was selected as the adsorbent.The adsorption kinetics was studied in detail.The experimental data were fitted by quasi first-order,quasi second-order and intra particle diffusion kinetic models,respectively.The experimental data is found better correlated by quasi second order kinetic model than the other two models.The adsorption thermodynamics of tetratoluene by UIO-66-NH_(2) was studied in detail.Both Langmuir and Freundlich equations were used and the Freundlich isotherm model showed better agreement with the experimental data.Gibbs free energy,enthalpy change and entropy change were calculated accordingly.This study can provide a guidance for the separation of tetratoluene isomers in C_(10) heavy aromatics.

关 键 词：金属-有机骨架材料 四甲苯 吸附 热力学 动力学 

分 类 号：TQ241.1[化学工程—有机化工]