微孔Noria聚合物用于二甲苯异构体吸附分离研究  

Microporous Noria polymer for selective adsorption and separation of xylene isomers

作　　者：钱庆玲 朱晴 杨正金 徐铜文[1] QIAN Qinging;ZHU Qing;YANG Zhengjin;XU Tongwen(School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,Anhui,China)

机构地区：[1]中国科学技术大学化学与材料科学学院,安徽合肥230026

出　　处：《化工学报》2022年第12期5438-5448,共11页CIESC Journal

基　　金：国家自然科学基金项目(21922510)。

摘　　要：二甲苯异构体的分离是一个非常重要但极具挑战性的工业过程,新型吸附剂材料的开发是实现其高效分离的关键。采用Noria和2,3,5,6-四氟对苯二腈制备了具有高比表面积的微孔Noria聚合物(MNP),并研究了MNP对二甲苯异构体的吸附分离能力。单组分二甲苯异构体在MNP上的吸附动力学及吸附等温线表明,MNP具有邻二甲苯优先吸附能力,Langmuir吸附等温线拟合得到邻二甲苯最大吸附量达344 mg·g-1。竞争吸附实验也表明MNP是一种邻二甲苯选择性吸附剂,邻二甲苯与间二甲苯的选择性最高可达2.4,邻二甲苯与对二甲苯选择性在1.9左右。动态穿透实验验证了MNP可以有效分离出邻二甲苯。此外,MNP具有极短的吸附平衡时间和优异的热稳定性,是一种具有潜力的邻二甲苯分离吸附剂。The separation of xylene isomers is an important but challenging industrial process,and the development of novel adsorbent materials is the key to achieving efficient separation.Herein,microporous Noria polymer(MNP)with network structure was synthesized by reacting Noria with 2,3,5,6-tetrafluoroterephthalonitrile and explored for the separation of xylene isomers.MNP is microporous and shows high specific surface area,as revealed by nitrogen adsorption and desorption isotherms.The adsorption of xylene isomers on MNP was investigated.The adsorption isotherms fit well to the Langmuir isotherm model and the adsorption kinetics of three xylene isomers can be described by the pseudo second-order kinetics model.We found that MNP shows a selective interaction with o-xylene,with a maximum adsorption capacity of up to 344 mg·g-1 for o-xylene according to Langmuir adsorption isotherm fitting.The selectivity of o-xylene over p-xylene is about 1.9 in competitive adsorption experiments,while that of o-xylene over m-xylene can reach as high as 2.4.Dynamic breakthrough experiments verify that MNP can effectively separate o-xylene from xylene isomer mixtures.In addition,MNP has an extremely short adsorption equilibrium time and excellent thermal stability,and is a potential adsorbent for the separation of o-xylene.

关 键 词：聚合物 微孔材料 二甲苯异构体分离 吸附 选择性 

分 类 号：TQ317.4[化学工程—高聚物工业]