隔壁塔萃取精馏分离碳酸二甲酯-甲醇的优化与控制  

Design and Control of Dimethyl Carbonate and Methanol Separation by an Extractive Dividing Wall Column

作　　者：彭家瑶 张青瑞[1] 郭通[1] 吕明莲 

机构地区：[1]青岛科技大学化工学院,山东青岛266042

出　　处：《石油学报（石油加工）》2017年第5期901-909,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：山东省自然科学基金项目(ZR2013BM001)资助

摘　　要：利用Aspen Plus软件,采用隔壁塔萃取精馏(EDWC)工艺,对碳酸二甲酯-甲醇共沸体系进行有效分离。稳态分析结果表明,EDWC比常规萃取精馏可减少再沸器负荷37.66%,年度总费用(TAC)可降低36.89%。在动态控制系统中,针对EDWC中主塔温度分布均匀、灵敏板选择困难的问题,给出一种简单有效的导斜率判据方法。利用Aspen Dynamics软件考察了主塔不同灵敏板以及3种控制结构的有效性。结果表明,当主塔灵敏板为第12块塔板时,采用带气相分配比的控制结构(CS2)能实现稳定控制。当主塔灵敏板为第5块塔板时,采用无气相分配比的控制结构(CS3)能有效处理进料流量和组成发生的±20%扰动,为较优的控制方案。The extractive dividing wall column（EDWC）process for separation dimethyl carbonate and methanol system was investigated by means of Aspen Plus.From the steady state results,it was found that compared with the traditional extractive distillation process,the EDWC process could achieve up to 37.66% savings of the energy consumption and reduce the total annual cost（TAC）by 36.89%.For the dynamic control system,aiming at the problems of choosing the suitable sensitive stage caused by the uniform temperature distribution of the main column,we proposed a simple and effective scheme.The influences of the selection of the sensitive stages and three dynamic control structures on the dynamic responses in the EDWC process were further studied using Aspen Dynamics.The dynamic simulation results revealed that the improved control structures with vapor split ratio（CS2）with stage 12 in the main column selected as the control stage showed effective control performance.When the stage 5 in the main column was selected as the control stage,control structure without vapor split ratio（CS3）could act as the control scheme because of its more practicality in application than the CS2,and more efficient dynamic controllability for the±20%feed flow rate and feed composition disturbances.

关 键 词：碳酸二甲酯 甲醇 隔壁塔萃取精馏 年度总费用(TAC) 动态控制 

分 类 号：TQ028.3[化学工程]