两段法固定床甲醇制芳烃工艺动态模拟与优化  

Dynamic simulation and optimization of methanol to aromatics by two-stage fixed-bed

作　　者：郭金丽 张玮[1] 许雄飞 刘鹏龙 徐红[1] 张侃[2] GUO Jin-li;ZHANG Wei;XU Xiong-fei;LIU Peng-long;XU Hong;ZHANG Kan(College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China;Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,Shanxi Province,China)

机构地区：[1]太原理工大学化学工程与技术学院,山西太原030024 [2]中国科学院山西煤炭化学研究所,山西太原030001

出　　处：《化学工程》2023年第2期89-94,共6页Chemical Engineering(China)

基　　金：山西省重点研发计划(201903D121027);中科院关键技术人才项目(YB2021001);化学工程联合国家重点实验室开放课题(SKL-ChE-21A01);国家自然科学基金资助项目(22178241)。

摘　　要：两段法固定床甲醇制芳烃工艺复杂,产物种类多,各个单元间相互影响,变量间相互耦合,如何保证产品收率,推进其工业化发展,是该工艺亟需解决的难题。基于两段法甲醇制芳烃实验数据,采用UniSim软件对工艺进行动态模拟,研究了不同时刻进料醇质量分数、一段反应温度、二段反应温度和空速变化对芳烃选择性的影响,并对操作条件进行了优化。结果表明:进料醇质量分数与空速对芳烃选择性的影响显著。在实验范围内,当甲醇进料100%,一段反应温度450℃,二段反应温度480℃,空速为0.55 h^(-1)时的芳烃选择性S_(Aro)达到最大值93.34%;当甲醇进料90%,一段反应温度450℃,二段反应温度480℃,空速为0.6 h^(-1)时的三苯(苯,甲苯,二甲苯)选择性S_(BTX)达到最大值70.9%。The process of methanol to aromatics is complex by two-stage fixed bed, and the product types are various. The units interact with each other and the variables are coupled. How to ensure the product yield and promote its industrial development is an urgent problem to be solved in this process. Based on the experimental data of the two-stage methanol to aromatics, UniSim software was used to carry out dynamic simulation of the process. The effects of feed alcohol mass fraction, the primary reaction temperature, the secondary reaction temperature and space velocity on aromatics selectivity were studied, and the operating conditions were optimized. The results show that feed alcohol mass fraction and space velocity effect significantly on aromatics selectivity. In the experimental range, selectivity of aromatics S_(Aro) reaches the maximum value of 93.34% when methanol feed is 100%, the primary reaction temperature is 450 ℃, the secondary reaction temperature is 480 ℃, and space velocity is 0.55 h^(-1). Selectivity of three benzene(cbenzene, toluene, xylene) S_(BTX) reaches the maximum value of 70.9% when methanol feed is 90%, the primary reaction temperature is 450 ℃, the secondary reaction temperature is 480 ℃, and the space velocity is 0.6 h^(-1).

关 键 词：两段法 固定床 甲醇制芳烃 UniSim 动态仿真 优化 

分 类 号：TQ241[化学工程—有机化工]