苯/环己烷/环己烯萃取精馏过程的流程设计与节能  

Process design and energy saving for benzene/cyclohexane/cyclohexene extractive distillation process

作　　者：杨林睿 刘鉴漪 李玲 何永超 郑凯天 任建坡 许春建[1] YANG Linrui;LIU Jianyi;LI Ling;HE Yongchao;ZHENG Kaitian;REN Jianpo;XU Chunjian(State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学化工学院,化学工程联合国家重点实验室,天津300072

出　　处：《化工学报》2025年第2期731-743,共13页CIESC Journal

基　　金：化学工程联合国家重点实验室自主研究课题项目(SKL-ChE-22T06)。

摘　　要：环己烯是重要的化工原料,苯部分加氢法是生产环己烯的重要途径,其加氢产物中存在未转化的苯和副产物环己烷,精馏分离过程能耗巨大。以苯/环己烷/环己烯精馏过程的节能为研究对象,采用Aspen Plus模拟进行了工业四塔萃取精馏流程(FC)和三塔萃取精馏流程(TC)的优化设计和经济性对比,并确定TC流程为较优流程。在TC流程基础上,提出了热集成流程(TH)、热泵辅助热集成流程(THP)、隔壁塔-苯塔流程(EC1)、环己烷塔-隔壁塔流程(EC2)、热泵辅助隔壁塔-苯塔流程(EHP1)和热泵辅助环己烷塔-隔壁塔流程(EHP2)。结果表明,与三塔萃取精馏流程相比,改进流程相比于TC流程在TAC、能耗和CO_(2)排放量上均有不同程度的降低,其中EHP2流程的年度总成本、能耗和CO_(2)排放量分别降低了21.1%、32.6%和31.7%,是最佳的流程。Cyclohexene is an important chemical raw material,and the partial hydrogenation of benzene is a primary method of production.However,the process generates unconverted benzene and cyclohexane as a by-product.The distillation of cyclohexene consumes a lot of energy.This study explores the potential for energy savings in the distillation processes of benzene,cyclohexane,and cyclohexene.Aspen Plus simulation was employed to optimize and compare the economic viability of a four-column industrial extractive distillation process(FC)and a three-column extractive distillation process(TC),identifying the three-column process as more efficient.Based on the TC process,the heat integrated process(TH),heat pump assisted heat integrated process(THP),dividing wall tower-benzene tower process(EC1),cyclohexane tower-dividing wall tower process(EC2),heat pump assisted dividing wall tower-benzene tower process(EHP1)and heat pump assisted cyclohexane tower-dividing wall tower process(EHP2)were proposed.The results indicate that the heat pump-assisted cyclohexane column-dividing wall column process is the most optimal,achieving reductions in annual total cost,energy consumption,and CO_(2)emissions by 21.1%,32.6%,and 31.7%,respectively,compared to the three-column extractive distillation process.

关 键 词：精馏 纯化 分离 模拟 环己烯 

分 类 号：TQ028.4[化学工程]