标题：Dynamic control analyses of eco-efficient partially heat-integrated side-stream pressure-swing distillation processes
作者：Zhang, Qingjun; Zeng, Aiwu; Ma, Youguang; Yuan, Xigang; Gao, Jun
作者机构：[Zhang, Qingjun; Zeng, Aiwu; Ma, Youguang; Yuan, Xigang] Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R Chi 更多
通讯作者地址：Zeng, AW (corresponding author), Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China.
来源：SEPARATION AND PURIFICATION TECHNOLOGY
关键词：Side-stream pressure-swing distillation; Heat integration; Snowball; effect; Dynamic controllability
摘要：Dynamic control behavior analysis for the new partially heat-integrated side-stream pressure-swing distillation arrangement is performed with the demonstrating examples of separating a minimum-boiling ethyl-acetate/ethanol azeotrope and a maximum-boiling ethylenediamine/water azeotrope. The snowball effect is observed in these systems. The contribution of this paper is to develop some novel robust and effective control schemes to eliminate or attenuate this effect for these processes. The stable regulatory control is achieved with the dual-product composition held close to their steady-state design specifications when handling the large step changes in throughput and feed composition. The feature control loops of these novel control schemes are that the flowrate in the azeotropic recycle loop from high-pressure column is, respectively, used to control the level in reflux drum and column base of low-pressure column for the minimum- and maximum-boiling azeotropes.