Adsorption separation of mixed methyl ethyl benzenes by simulated moving bed
YE Lei1, WANG Cheng1, HUANG Ying-jie1, LIU Ji-chang1,2, SHEN Ben-xian1,2, SUN Hui1,2
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. International Joint Research Center of Green Energy Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Abstract: 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%.
叶磊, 汪成, 黄英杰, 刘纪昌, 沈本贤, 孙辉. 模拟移动床吸附分离对甲乙苯工艺[J]. 现代化工, 2020, 40(5): 199-203,207.
YE Lei, WANG Cheng, HUANG Ying-jie, LIU Ji-chang, SHEN Ben-xian, SUN Hui. Adsorption separation of mixed methyl ethyl benzenes by simulated moving bed. Modern Chemical Industry, 2020, 40(5): 199-203,207.
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