Design and Control of Extractive Dividing-Wall Column for Separating Ethyl Acetate–Isopropyl Alcohol Mixture
Design and Control of Extractive Dividing-Wall Column for Separating Ethyl Acetate–Isopropyl Alcohol Mixture
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DOI：
10.1021/ie403618f
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发表时间：
2014-01
影响因子：
4.2
通讯作者：
Haoxiang Zhang;Qing Ye;Jiwei Qin;Hong Xu;Ning Li
中科院分区：
文献类型：
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作者：
Haoxiang Zhang;Qing Ye;Jiwei Qin;Hong Xu;Ning Li
本文将萃取隔壁塔作为三塔系统进行模拟。在白杨Plus和白杨Dynamics中研究了以乙二醇为分离剂的EDWC分离乙酸乙酯和异丙醇的设计和控制。首先筛选出年总费用最小的EDWC优化设计方案;然后进行灵敏度分析，考察能否以精馏塔流量和蒸汽分流比作为控制变量来保持纯度指标;最后建立了EDWC的3种控制结构，并对3种控制结构的动态结果进行了比较。结果表明，与基本控制结构相比，两种改进的控制结构具有更小的偏差和更短的调节时间，达到了令人满意的性能。动态结果还表明，调整蒸发器流量或蒸汽分流比以保持纯度规格是有用的。
An extractive dividing-wall column (EDWC) is simulated as a three-column system in this work. The design and control of the EDWC to separate ethyl acetate and isopropyl alcohol using ethylene glycol as the entrainer is studied in Aspen Plus and Aspen Dynamics. The optimum EDWC design with minimal total annual cost is screened first; then sensitivity analysis is conducted to investigate whether the entrainer flow rate and vapor split ratio can be used as control variables to hold the purity specifications; finally, three control structures for the EDWC are established, and the dynamic results of these control structures are compared. It is found that two improved control structures achieve satisfactory performance with much smaller deviation and shorter settling time by comparison to the basic control structure. Dynamic results also revealed that it is useful to adjust the entrainer flow rate or vapor split ratio to hold the purity specifications.