The steady-state design and dynamic performances of three extractive distillation configurations including conventional extractive distillation (CED), thermally integrated extractive distillation (TIED) and extractive dividing-wall column (EDWC) are investigated and compared for separating the methanol/toluene azeotrope with intermediate-boiling triethylamine (Et3N) as solvent. The results show that TIED and EDWC configurations can save 21.28 % and 52.70 % energy consumption compared to CED, respectively, but the difficulty of controllability will be increased due to a more complex flowsheet. Towards this end, two control structures for EDWC are established and tested via introducing feed throughput and compositions disturbances as well as one control structure for CED and five control structures for TIED. Similar to CED, the control structures of TIED and EDWC configurations can also maintain products purities and integral squared error (ISE) within the acceptable range in resisting feed disturbances. Furthermore, EDWC configuration still reflects high energy-efficiency compared to CED and TIED after smoothing.

研究了三种萃取蒸馏装置的稳态设计和动态性能，包括常规萃取蒸馏（CED），热集成萃取蒸馏（TIED）和萃取分隔壁塔（EDWC），并将其与中间体分离甲醇/甲苯共沸物-沸腾三乙胺（Et 3 N）作为溶剂。结果表明，与CED相比，TIED和EDWC配置可分别节省21.28％和52.70％的能耗，但是由于流程更加复杂，可控制的难度将增加。为此，通过引入进料量和成分干扰建立并测试了EDWC的两个控制结构，以及CED的一个控制结构和TIED的五个控制结构。与CED类似，TIED和EDWC配置的控制结构还可以将产品纯度和积分平方误差（ISE）维持在可接受的范围内，以抵抗进料干扰。此外，与平滑后的CED和TIED相比，EDWC配置仍然反映出高能效。