Design and Control of Dividing-Wall Column for tert-Butanol Dehydration System via Heterogeneous Azeotropic Distillation
Design and Control of Dividing-Wall Column for tert-Butanol Dehydration System via Heterogeneous Azeotropic Distillation
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DOI：
10.1021/ie504325g
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发表时间：
2015-03
影响因子：
4.2
通讯作者：
Hao Yu;Qing Ye;Hong Xu;Haoxiang Zhang;Xin Dai
中科院分区：
文献类型：
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作者：
Hao Yu;Qing Ye;Hong Xu;Haoxiang Zhang;Xin Dai
本文研究了非均相共沸精馏（HAD）的共沸分壁塔（a - dwc）的三柱模型，并对以环己烷为夹带剂的叔丁醇（t-丁醇）脱水进行了设计和控制。优化后的a - dwc设计与原来的两柱设计相比，能耗节约23.80%，年总成本（TAC）减少19.93%。在建立a - dwc的控制结构之前，对液裂比（βL）能否作为维持产品纯度的可操纵变量进行敏感性分析。同时，在A-DWC中仍然保留两个重沸器任务（QRs）的情况下，所提出的控制结构可以解决干扰问题，使产品纯度保持在非常接近设定点的水平，偏差小，沉降时间短。
In this Article, a three-column model of azeotropic dividing-wall column (A-DWC) for heterogeneous azeotropic distillation (HAD) is investigated by demonstrating the design and control of tert-butanol (t-butanol) dehydration using cyclohexane as entrainer. Significant energy consumption savings of 23.80% and a minimal total annual cost (TAC) reduction of 19.93% between the optimum A-DWC design and the original two-column design can be obtained, respectively. Sensitivity analysis of whether the liquid split ratio (βL) can be a manipulated variable to maintain the product purities is conducted before the control structure for the A-DWC is established. Meanwhile, with two reboiler duties (QRs) still preserved in the A-DWC, the proposed control structure can solve disturbance issues and maintain the product purities very close to the set points with small deviation and short settling time.