反应蒸馏
三元运算
温度控制
蒸馏
工艺工程
萃取蒸馏
体积流量
吞吐量
化学
过程控制
工作(物理)
环氧乙烷
过程(计算)
色谱法
热力学
计算机科学
控制工程
有机化学
工程类
物理
程序设计语言
操作系统
电信
聚合物
共聚物
无线
作者
Tsai-Wei Wu,I‐Lung Chien
标识
DOI:10.1016/j.seppur.2022.121159
摘要
Novel control strategy by just using temperature measurements for an intensified hybrid reactive-extractive distillation system used to separate water-containing ternary mixtures is developed in this work. Due to the complicated interaction between reaction and vapour-liquid equilibrium in the same reactive-extractive distillation column, it is inherently challenging to design a control structure for this design configuration. Furthermore, the flow rate of ethylene oxide (EO), used as a dehydrating agent in the design configuration, needs to be manipulated accurately to the expected value so that on one hand, this highly flammable substance would not be released out of the system; on the other hand, water would not become the excess impurity in product streams. Without using expensive composition controllers, the results of closed-loop sensitivity tests and corresponding profiles of temperature deviations in columns under various feed composition disturbances are used to develop only temperature and temperature-difference control loops as surrogates of quality control loops. The best control structures also demonstrate that they are resilient to measurable throughput disturbances as long as setpoints of temperature-related control loops can be adjusted according to different throughput changes. The procedure of developing the best overall control strategy is demonstrated on two separation systems of TBA/EtOH/H2O and THF/EtOH/H2O, which have different characteristics on the number of azeptropes in the system.
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