乙烯三聚制备1-己烯工艺分离工段的模拟优化  

Simulation and optimization of separation section in ethylene trimerization process for 1-hexene preparation

作　　者：沈丽华 姜涛 从海峰 王亚婷 SHEN Lihua;JIANG Tao;CONG Haifeng;WANG Yating(College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津大学化工学院,天津300350

出　　处：《天然气化工—C1化学与化工》2022年第6期119-126,共8页Natural Gas Chemical Industry

基　　金：中国石油科技创新基金(2020D-5007-0405)。

摘　　要：针对乙烯三聚制备1-己烯工艺分离工段能耗高的问题,运用Aspen Plus化工流程模拟软件对现有工艺各个精馏塔的塔板数和进料位置进行了模拟优化,得到脱轻塔、1-癸烯回收塔、溶剂回收塔和1-己烯纯化塔的理论塔板数分别为10块、31块、54块和12块及进料位置分别为第2块理论塔板、第21块理论塔板、第23块理论塔板和第4块理论塔板的常规顺序下的总能耗为4062.0 kW,年度总成本(TAC)为1561.15×10^(3)$/a。在现有工艺基础上进行了改进,通过改变精馏塔顺序实现了溶剂两段循环,并对循环比例和停留时间等参数进行了优化设计。模拟结果表明,当循环比例为0.9和停留时间为30 min时,以环己烷为溶剂的新工艺的能耗为2924.9 kW,TAC为1142.46×10^(3)$/a,比现有工艺的能耗降低了27.99%,TAC减少了26.82%。To address the problem of high energy consumption in separation section of ethylene trimerization to prepare 1-hexene process,Aspen Plus chemical process simulation software was used to simulate and optimize the numbers of plates and feed positions of each distillation column in the existing process.The total energy consumption is 4062.0 kW and the total annual cost(TAC)is 1561.15×10^(3)$/a when the theoretical numbers of the plates of delighting column,1-decene recovery column,solvent recovery column and 1-hexene purification column are 10,31,54 and 12,and feed positions are the second theoretical plate,the 21st theoretical plate,the 23rd theoretical plate and the fourth theoretical plate respectively.On the basis of the existing process,an improvement was made by changing the distillation columns order to achieve a two-stage solvent cycle and the parameters such as circulation ratio and residence time were optimized.The simulation results show that the energy consumption of new process using cyclohexane as solvent is 2924.9 kW and TAC is 1142.46×10^(3)$/a when the recirculation ratio is 0.9 and residence time is 30 min,27.99% less energy consumption and 26.82% less TAC than the existing process.

关 键 词：乙烯三聚 1-己烯 流程模拟 工艺优化 能耗 年度总成本 

分 类 号：TQ028.3[化学工程]