Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

doi:10.1016/j.cjche.2023.11.026

中国化学工程学报 ›› 2024, Vol. 68 ›› Issue (4): 1-7.DOI: 10.1016/j.cjche.2023.11.026

• • 下一篇

Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

Lianjie Wu¹, Kun Lu¹, Qirui Li¹, Lianghua Xu¹, Yiqing Luo², Xigang Yuan²

1. Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, College of Chemical and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China

收稿日期:2023-08-21 修回日期:2023-11-24 出版日期:2024-04-28 发布日期:2024-06-28
通讯作者: Lianghua Xu,Tel.:+86 13516113009.E-mail address:xulh@tjut.edu.cn
基金资助:
This research was financially supported by the National Natural Science Foundation of China (21406170) and the State Key Laboratory of Chemical Engineering (SKL-ChE-22B02).

Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

Lianjie Wu¹, Kun Lu¹, Qirui Li¹, Lianghua Xu¹, Yiqing Luo², Xigang Yuan²

1. Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, College of Chemical and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China;
2. State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China

Received:2023-08-21 Revised:2023-11-24 Online:2024-04-28 Published:2024-06-28
Contact: Lianghua Xu,Tel.:+86 13516113009.E-mail address:xulh@tjut.edu.cn
Supported by:
This research was financially supported by the National Natural Science Foundation of China (21406170) and the State Key Laboratory of Chemical Engineering (SKL-ChE-22B02).

摘要/Abstract

摘要： A huge amount of energy is always consumed to separate the ternary azeotropic mixtures by distillations. The heterogeneous azeotropic distillation and the pressure-swing distillation are two kinds of effective technologies to separate heterogeneous azeotropes without entrainer addition. To give better play to the synergistic energy-saving effect of these two processes, a novel pressure-swing-assisted ternary heterogeneous azeotropic distillation (THAD) process is proposed firstly. In this process, the ternary heterogeneous azeotrope is decanted into two liquid phases before being refluxed into the azeotropic distillation column to avoid the aqueous phase remixing, and three columns' pressures are modified to decrease the flowrates of the recycle streams. Then the dividing wall column and heat integration technologies are introduced to further reduce its energy consumption, and the pressure-swing-assisted ternary heterogeneous azeotropic dividing-wall column and its heat integration structure are achieved. A genetic algorithm procedure is used to optimize the proposed processes. The design results show that the proposed processes have higher energy efficiencies and lower CO₂ emissions than the published THAD process.

关键词: Distillation, Separation, Process control, Process systems

Abstract: A huge amount of energy is always consumed to separate the ternary azeotropic mixtures by distillations. The heterogeneous azeotropic distillation and the pressure-swing distillation are two kinds of effective technologies to separate heterogeneous azeotropes without entrainer addition. To give better play to the synergistic energy-saving effect of these two processes, a novel pressure-swing-assisted ternary heterogeneous azeotropic distillation (THAD) process is proposed firstly. In this process, the ternary heterogeneous azeotrope is decanted into two liquid phases before being refluxed into the azeotropic distillation column to avoid the aqueous phase remixing, and three columns' pressures are modified to decrease the flowrates of the recycle streams. Then the dividing wall column and heat integration technologies are introduced to further reduce its energy consumption, and the pressure-swing-assisted ternary heterogeneous azeotropic dividing-wall column and its heat integration structure are achieved. A genetic algorithm procedure is used to optimize the proposed processes. The design results show that the proposed processes have higher energy efficiencies and lower CO₂ emissions than the published THAD process.

Key words: Distillation, Separation, Process control, Process systems

Lianjie Wu, Kun Lu, Qirui Li, Lianghua Xu, Yiqing Luo, Xigang Yuan. Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations[J]. 中国化学工程学报, 2024, 68(4): 1-7.

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Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

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