提出了一种用于分离三元共沸体系苯/异丙醇/水的新型热集成双侧线萃取精馏方案。与传统方案相比，热集成方案可以进一步降低15.8%的TAC和18.88%的CO₂排放。对2种工艺的动态可控性进行了进一步研究，并将开环和闭环相结合的方法应用到寻找温度控制板的工作中，针对传统的双稳态系统设计了一种高鲁棒控制结构（CS1）；同时将旁路策略和添加额外小型换热器应用到热集成控制中，针对热集成双稳态系统设计了CS2和CS3两种鲁棒控制结构。通过添加±10%流量扰动和±20%组分扰动对控制结构的性能进行了测试，研究发现，CS1在进料流量扰动和组分扰动下具有良好的动态特性，CS2和CS3都能抵抗进料流量和组分扰动，但CS3的控制效果比CS2更优。

A novel thermally-integrated double side-steam extractive distillation process scheme is proposed for separating benzene/isopropanol/water in a ternary azeotropic system.Compared with traditional process scheme,this thermally-integrated process scheme can further reduce TAC by 15.8% and CO₂ emission by 18.88%.The dynamic controllability of two processes is further studied,and the open-loop and closed-loop methods are both applied to find the temperature control stage.A high robust control structure (CS1) is designed for traditional distillation system.At the same time,the bypass strategy and the addition of a small heat exchanger are applied to the thermally-integrated control.Two robust control structures named CS2 and CS3 are designed for the thermally-integrated distillation system.The performances of these control structures are tested by adding ±10% and ±20% disturbances in feed flowrate and composition.It is found that CS1 has good dynamic characteristics under feed flow disturbance and component disturbance.Both CS2 and CS3 can resist the disturbances of feed flow and composition,but the control effect of CS3 is better than CS2.

徐良(1996-),男,硕士生;白文帅(1986-),男,博士,讲师,研究方向为化工安全和化工过程模拟,通讯联系人,wsbai@hebut.edu.cn。