分隔壁精馏塔在乙苯装置分离工艺中的应用及能耗分析  

Application and energy consumption analysis of dividing wall column in separation unit of ethylbenzene plant

作　　者：郭湘波[1] 王瑾[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《现代化工》2016年第10期176-179,共4页Modern Chemical Industry

摘　　要：采用分隔壁精馏塔(DWC)精馏技术对乙苯装置分离工艺进行了改进,将传统分离工艺中的苯塔和乙苯塔集成为1个分隔壁精馏塔,不仅可以实现烷基化产物的分离,而且可以有效降低装置能耗。使用Aspen Plus流程模拟软件对基于DWC的新分离工艺进行了全流程模拟,并对传统分离工艺和分隔壁塔新工艺的能耗进行了对比。计算结果表明,分隔壁塔总塔板数为58块,分隔壁在第15块到第40块塔板之间,进料位置在第24块塔板,侧线抽出苯位置在第4块板,侧线采出乙苯产品位置在第26块板,塔顶回流比为2.3。侧线抽出苯和塔顶采出苯的质量分数分别为99.44%和99.20%,中间侧线采出乙苯的质量分数为99.94%,塔釜物料中乙苯的质量分数为0.06%。分隔壁精馏塔实现了苯、乙苯和多乙苯物系的清晰分离。计算结果还表明,采用DWC分离工艺的能耗比传统的顺序分离工艺降低约41%。Sequential separation process of the ethylbenzene plant is improved by using DWC technology,in which the benzene tower and ethylbenzene tower are integrated into a dividing wall column in order to separate benzene,ethylbenzene and polyethylbenzene. Such a new separation process is simulated by Aspen Plus software with RK-SOAVE property method. The optimal process parameters of the dividing wall column are as follows： 58 of the number of theoretical stages of DWC,placing the dividing wall at plate 15- 40,24 of feed stage,plate 4 of side benzene outlet,2. 3of reflux ratio. Under these conditions,benzene mass fraction in side outlet and top outlet are 99. 44% and 99. 20%respectively. Mass fraction of ethylbenzene in side product and bottom product are 99. 94% and 0. 06% respectively. It could be seen that a clear separation of benzene,ethylbenzene and polyethylbenzene is achieved by using the DWC. In addition,the novel separation process can save energy up to 41% compared with traditional separation process.

关 键 词：分隔壁 精馏 乙苯 能耗 

分 类 号：TQ028[化学工程]