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

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

Energy, 2025, vol. 335, issue C

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 %.

Keywords: Phase diagram analysis; Thermodynamic behavior; Heat integration (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225036825
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:335:y:2025:i:c:s0360544225036825

DOI: 10.1016/j.energy.2025.138040

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().