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Shi, Tao; Chun, Wei; Yang, Ao; Su, Yang; Jin, Saimeng; Ren, Jingzheng; Shen, Weifeng
Chemical engineering science, 04/2020, Volume: 215Journal Article
Display omitted •A systematic design process is proposed for the side-stream extractive distillation.•The conceptual design is conducted to determine feasible regions and sequences.•The genetic algorithm optimization is superior in evaluating multiple objectives.•The anti-disturbance performance of three control structures is compared by the IAE.•The CS3 of EDSH with feedforward and cascade shows gratifying dynamic responses. Currently, limited efforts have focused on the multi-objective optimization and effective control of the side-stream extractive distillation processes (EDS). Herein, the EDS and a heat-integration scheme (EDSH) are proposed for separating the minimum-boiling azeotropic mixture ethyl acetate (EtAC)-ethanol (EtOH). Firstly, the conceptual design by residue curve maps is demonstrated for the EDS. Following which, the genetic algorithm (GA) optimization is carried out to minimize the total capital investment cost (CAP) and the annual energy cost (ENR). Optimal scheme under the product purity constraints is then obtained from the Pareto front. And the EDSH scheme is shown with less TAC and CO2 emission. Therefore, an improved control structure CS3 combining the composition-(RR1/SIDE) cascade and feedforward strategy is developed to achieve decent dynamic responses for the EDSH. The anti-disturbance capability of different control structures in terms of the transient deviation and offsets are compared with the assistance of the integral absolute error.
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