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Reduction of the energy demand and multi-performance evaluation of the pressure-swing and extractive distillation separation of the ethanol/benzene/ cyclohexane azeotropic system

Author

Listed:
  • Yang, Qiyan
  • Su, Lin
  • Tang, Zhengyang
  • Xu, Hongbo
  • Wang, Yumeng
  • Wang, Wenxin
  • Wang, Yinglong
  • Li, Xin
  • Zhong, Limei
  • Yang, Jingwei
  • Cui, Peizhe

Abstract

Appropriate process and energy-saving enhancements are crucial for the separation of established systems. The feasibility and separation principle of pressure-swing distillation separation process for ethanol/benzene/cyclohexane azeotropic system were analyzed through residue curve maps, and the pressure-swing distillation process was proposed. Efficient extractants for separating binary azeotropic systems were screened based on relative volatility, and an extractive distillation process was proposed. The non-dominated sorting genetic algorithms-Ⅱ was used to optimize the pressure-swing distillation and extractive distillation process with the goal of achieving the annual minimum TAC and gas emissions. Enhancement strategies such as heat-integrated pressure-swing distillation, vapor recompression assisted extractive distillation, and heat-integrated extractive distillation are proposed based on the process characteristics of pressure-swing distillation and extractive distillation. Finally, a comprehensive evaluation was conducted on the economic, energy-saving, environmental and exergy aspects of the five processes. The results indicate that heat-integrated extractive distillation has the best process performance. Compared with pressure-swing distillation and extractive distillation, TAC decreased by 76.72 % and 22.3 %, energy consumption decreased by 84.22 % and 30.13 %, gas emissions decreased by 84.22 % and 30.13 %, and exergy efficiency increased by 13.21 % and 7.04 %.

Suggested Citation

  • Yang, Qiyan & Su, Lin & Tang, Zhengyang & Xu, Hongbo & Wang, Yumeng & Wang, Wenxin & Wang, Yinglong & Li, Xin & Zhong, Limei & Yang, Jingwei & Cui, Peizhe, 2025. "Reduction of the energy demand and multi-performance evaluation of the pressure-swing and extractive distillation separation of the ethanol/benzene/ cyclohexane azeotropic system," Energy, Elsevier, vol. 335(C).
    • Handle: RePEc:eee:energy:v:335:y:2025:i:c:s0360544225036825
    DOI: 10.1016/j.energy.2025.138040
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    References listed on IDEAS

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    1. Zhao, Yongteng & Ma, Kang & Bai, Wenting & Du, Deqing & Zhu, Zhaoyou & Wang, Yinglong & Gao, Jun, 2018. "Energy-saving thermally coupled ternary extractive distillation process by combining with mixed entrainer for separating ternary mixture containing bioethanol," Energy, Elsevier, vol. 148(C), pages 296-308.
    2. Li, Chen & Wang, Yinglong & Chen, Guanghui & Li, Quan & Gu, Xinchun & Li, Xin & Wang, Yuguang & Zhu, Zhaoyou & Li, Jianlong, 2022. "Thermodynamic analysis and process optimization of organosilicon distillation systems," Energy, Elsevier, vol. 252(C).
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    4. Zhang, Hongru & Wang, Shuai & Tang, Jiaxuan & Li, Ningning & Li, Yanan & Cui, Peizhe & Wang, Yinglong & Zheng, Shiqing & Zhu, Zhaoyou & Ma, Yixin, 2021. "Multi-objective optimization and control strategy for extractive distillation with dividing-wall column/pervaporation for separation of ternary azeotropes based on mechanism analysis," Energy, Elsevier, vol. 229(C).
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