模拟移动床吸附分离对甲乙苯工艺  

Adsorption separation of mixed methyl ethyl benzenes by simulated moving bed

作　　者：叶磊 汪成 黄英杰 刘纪昌[1,2] 沈本贤 孙辉[1,2] YE Lei;WANG Cheng;HUANG Ying-jie;LIU Ji-chang;SHEN Ben-xian;SUN Hui(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Interational Joint Research Center of Green Energy Chemical Engineering,Fast China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]绿色能源化工国际联合研究中心,上海200237

出　　处：《现代化工》2020年第5期199-203,207,共6页Modern Chemical Industry

基　　金：石油化工联合基金重点项目(U1862204)。

摘　　要：为了实现C9芳烃中对甲乙苯资源的高效利用,以X型分子筛为吸附剂,以混合甲乙苯为原料,采用液相模拟移动床吸附工艺分离对甲乙苯(p-MEB)与邻甲乙苯(o-MEB)、间甲乙苯(m-MEB)。在操作温度为75℃、操作压力为0.25 MPa的条件下,在液相模拟移动床吸附分离装置上考察了操作条件对p-MEB吸附分离过程的影响规律,获得优化的p-MEB吸附分离工艺条件为:模拟移动床区域分布采用6-3-4-3模式,切换时间900 s,分配比1.1,循环比3.5,脱附剂比9.3。对于pMEB质量分数为20.78%的C9芳烃,优化分离工艺条件下得到的p-MEB质量分数为94.52%,回收率达到90.86%。In order to realize the efficient utilization of p-methyl ethyl benzene(p-MEB)resources in C9 aromatics,the separation process of p-MEB,o-methyl ethyl benzene(o-MEB)and m-methyl ethyl benzene(m-MEB)is studied by using liquid phase simulated moving bed adsorption separation technology with X-type molecular sieves as adsorbent and mixed methyl ethyl benzene as raw material.Under the conditions of operating temperature at 75℃and operating pressure at 0.25 MPa,the influence rules of operating conditions on the adsorption separation process of p-MEB are investigated in a liquid-phase simulated moving bed adsorption separation device.At the same time,the SMB module of Aspen Chromatography is used to simulate and verify the rules under the experimental conditions.The optimum conditions for p-MEB adsorption separation process are as follows:the simulated moving bed adopts 6-3-4-3 mode in regional distribution,switching time is 900 s,distribution ratio is 1.11,circulation ratio is 3.5 and desorption agent ratio is 9.3.As for C9 aromatics containing 20.78%of p-MEB,the purity of p-MEB product obtained from the optimal separation process conditions can reach 94.52%and the recovery rate can achieve 90.86%.

关 键 词：对甲乙苯 吸附 模拟移动床 分子筛 

分 类 号：TQ241.1[化学工程—有机化工]