Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation

doi:10.1016/j.cjche.2016.06.013

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (11): 1584-1599.DOI: 10.1016/j.cjche.2016.06.013

• 第25届中国过程控制会议专栏 • 上一篇下一篇

Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation

Zhishan Zhang¹, Qingjun Zhang¹, Guijie Li², Meiling Liu¹, Jun Gao¹

1 College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2 School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

收稿日期:2015-09-21 修回日期:2016-06-22 出版日期:2016-11-28 发布日期:2016-12-06
通讯作者: Zhishan Zhang

Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation

Zhishan Zhang¹, Qingjun Zhang¹, Guijie Li², Meiling Liu¹, Jun Gao¹

1 College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2 School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Received:2015-09-21 Revised:2016-06-22 Online:2016-11-28 Published:2016-12-06
Contact: Zhishan Zhang

摘要/Abstract

摘要： Design and control of pressure-swing distillation (PSD) with different heat integration modes for the separation of methyl acetate/methanol azeotrope are explored using Aspen Plus and Aspen Dynamics. First, an optimum steady-state separation configuration conditions are obtained via taking the total annual cost (TAC) or total reboiler heat duty as the objective functions. The results show that about 27.68% and 25.40% saving in TAC can be achieved by the PSD with full and partial heat integration compared to PSD without heat integration. Second, temperature control tray locations are obtained according to the sensitivity criterion and singular value decomposition (SVD) analysis and the single-end control structure is effective based on the feed composition sensitivity analysis. Finally, the comparison of dynamic controllability is made among various control structures for PSD with partial and full heat integration. It is shown that both control structures of composition/temperature cascade and pressure-compensated temperature have a good dynamic response performance for PSD with heat integration facing feed flowrate and composition disturbances. However, PSD with full heat integration performs the poor controllability despite of a little bit of economy.

关键词: Pressure-swing distillation, Azeotrope, Heat integration, Dynamic control, Methyl acetate/methanol

Abstract: Design and control of pressure-swing distillation (PSD) with different heat integration modes for the separation of methyl acetate/methanol azeotrope are explored using Aspen Plus and Aspen Dynamics. First, an optimum steady-state separation configuration conditions are obtained via taking the total annual cost (TAC) or total reboiler heat duty as the objective functions. The results show that about 27.68% and 25.40% saving in TAC can be achieved by the PSD with full and partial heat integration compared to PSD without heat integration. Second, temperature control tray locations are obtained according to the sensitivity criterion and singular value decomposition (SVD) analysis and the single-end control structure is effective based on the feed composition sensitivity analysis. Finally, the comparison of dynamic controllability is made among various control structures for PSD with partial and full heat integration. It is shown that both control structures of composition/temperature cascade and pressure-compensated temperature have a good dynamic response performance for PSD with heat integration facing feed flowrate and composition disturbances. However, PSD with full heat integration performs the poor controllability despite of a little bit of economy.

Key words: Pressure-swing distillation, Azeotrope, Heat integration, Dynamic control, Methyl acetate/methanol

Zhishan Zhang, Qingjun Zhang, Guijie Li, Meiling Liu, Jun Gao. Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation[J]. Chinese Journal of Chemical Engineering, 2016, 24(11): 1584-1599.

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Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation

Design and control of methyl acetate-methanol separation via heat-integrated pressure-swing distillation

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