C_(8)芳烃中乙苯吸附分离材料的制备与性能研究  

Preparation and properties study of adsorption separation materials for ethylbenzene in C_(8)aromatic hydrocarbons

作　　者：赵可心 濮鑫 刘纪昌[1,2] 张健 张金山 胡炳星 ZHAO Ke-xin;PU Xin;LIU Ji-chang;ZHANG Jian;ZHANG Jin-shan;HU Bing-xing(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832000,China;Xinjiang Jiayuheng Energy Technology Co.,Ltd.,Huyanghe 834018,China)

机构地区：[1]华东理工大学化工学院,上海200237 [2]石河子大学化学化工学院,新疆石河子832000 [3]新疆佳宇恒能源科技有限公司,新疆胡杨河834018

出　　处：《现代化工》2024年第S02期309-316,323,共9页Modern Chemical Industry

摘　　要：采用水热合成法制备低硅铝比X型分子筛(LSX),通过离子改性法研究了离子种类、交换次数等制备Rb-LSX的最佳条件。利用单组分和多组分吸附实验探究吸附时间、溶液浓度等对C_(8)芳烃吸附分离的影响,并对其进行吸附动力学、吸附等温线和吸附扩散性能研究。结果表明,在298 K下,单组分吸附实验中C_(8)芳烃在Rb-LSX上的吸附量大小为:乙苯(EB,162.05 mg/g)>对二甲苯(PX,141.00 mg/g)>间二甲苯(MX,128.67 mg/g)>邻二甲苯(OX,125.02 mg/g),且Rb-LSX对4种芳烃分子的吸附过程符合Langmuir等温线模型和准二级动力学模型;在多组分吸附实验中,EB/PX、EB/MX和EB/OX的选择性分别为6.94、5.41、7.20;C_(8)芳烃分子在Rb-LSX分子筛中的扩散能力大小为:EB>MX>PX>OX。LSX,a X-type zeolite with low Si-Al ratio,is prepared via hydrothermal synthesis method.The optimum preparation conditions for Rb-LSX,including the types of ions and exchange frequences,are studied through ion modification method.The impacts of adsorption time and solution concentration on the adsorption and separation of C_(8)aromatics are explored by means of single-component and multi-component adsorption experiments,and the adsorption kinetics,adsorption isotherm and adsorption diffusion properties are studied.Results show that the adsorption capacity of C_(8)aromatic hydrocarbons on Rb-LSX at 298 K is in the following order:ethylbenzene(EB,162.05 mg·g^(-1))>p-xylene(PX,141.00 mg·g^(-1))>m-xylene(MX,128.67 mg·g^(-1))>o-xylene(OX,125.02 mg·g^(-1)).Moreover,the adsorption process of Rb-LSX for these four aromatics is consistent with Langmuir isotherm model and quasi-second-order kinetic model.In the multi-component adsorption experiment,the selectivity rates of EB/PX,EB/MX and EB/OX are 6.94,5.41 and 7.20,respectively.The diffusion capacity of C_(8)aromatic molecules in Rb-LSX molecular sieve is in order of EB>MX>PX>OX.

关 键 词：C_(8)芳烃 乙苯 X型分子筛 吸附分离 分子动力学模拟 

分 类 号：TQ028[化学工程]