For the industrial separation problem of acetonitrile/methanol/benzene involving three azeotropes, this article proposes two novel intensified configurations with chlorobenzene as solvent by extending the extractive dividing-wall column (EDWC) and side-stream extractive distillation column (SEDC) from single azeotropic to multiazeotropic mixtures and makes a comparison with a conventional extractive distillation (CED) configuration in aspects of economic and controllability. Steady-state designs are optimized via using the sequential iterations search based on minimum total annual cost (TAC). The results show that extended-EDWC and extended-SEDC compared to CED can reduce TAC by 6.32% and 14.39% and energy consumption by 4.26% and 20.59%, respectively. As far as controllability is concerned, all proposed control structures can hold products at high purities with acceptable deviations and short settle time after introducing feed flow and composition disturbances. Overall, apparent economic benefits and high energy efficiency provided by the extended-SEDC configuration can be achieved without a deterioration of control behavior for some multiazeotropic mixtures.

中文翻译：

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乙腈/甲醇/苯混合物的常规萃取和强化萃取蒸馏配置的经济性和可控性

针对涉及三个共沸物的乙腈/甲醇/苯的工业分离问题，本文提出了一种以氯苯为溶剂的新型强化构型，其方法是将萃取分隔壁塔（EDWC）和侧流萃取蒸馏塔（SEDC）从单一共沸物中扩展而来。与多共沸混合物相比，在经济和可控制性方面与常规萃取蒸馏（CED）配置进行了比较。通过使用基于最小总年度成本（TAC）的顺序迭代搜索来优化稳态设计。结果表明，与CED相比，扩展的EDWC和扩展的SEDC可以分别减少TAC 6.32％和14.39％，能耗分别降低4.26％和20.59％。就可控性而言，在引入进料流量和成分干扰后，所有建议的控制结构都可以将产品保持在高纯度下，具有可接受的偏差和较短的沉降时间。总体而言，扩展的SEDC配置可提供明显的经济效益和高能效，而不会降低某些多共沸混合物的控制性能。