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Economical process design of reactive-extractive distillation combining variable pressure and heat integration for separating a ternary azeotropic mixture

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  • Zhang, Fangkun
  • Li, Zeng
  • Shan, Baoming
  • Zhu, Zhaoyou
  • Wang, Yinglong
  • Xu, Qilei

Abstract

Research and development of environmentally friendly processes that can generate significant profits has always been a focus of attention in pharmaceutical and chemical fields. In this study, a novel reactive-extractive pressure-swing distillation (REPSD) process was designed to separate tetrahydrofuran (THF)-methanol-water (TMW) ternary azeotropic mixtures. Ethylene oxide (EO) is reacted with water to form ethylene glycol (EG) in a reactive distillation (RD) column, which removes the water from the mixture. Then, the THF-methanol (TM) mixture is separated by extractive distillation (ED) and pressure-swing distillation (PSD). A multi-objective genetic algorithm (MUOGA) with total annual cost (TAC) and total capital cost (TCC) as objective functions, along with heat integration techniques were used to optimise the designed REPSD process. Optimal operating conditions to achieve maximum economic benefits were obtained for the process. Subsequently, the environmental benefits of the process were evaluated. The results showed that the proposed REPSD with heat integration can significantly reduce the TAC and CO2 emissions by 29.1 and 26.9 %, respectively, compared to existing optimal heat integration extractive distillation (HIED) processes. This study provides a new perspective on the separation and purification of ternary azeotropic mixtures.

Suggested Citation

  • Zhang, Fangkun & Li, Zeng & Shan, Baoming & Zhu, Zhaoyou & Wang, Yinglong & Xu, Qilei, 2024. "Economical process design of reactive-extractive distillation combining variable pressure and heat integration for separating a ternary azeotropic mixture," Energy, Elsevier, vol. 312(C).
    • Handle: RePEc:eee:energy:v:312:y:2024:i:c:s0360544224033401
    DOI: 10.1016/j.energy.2024.133562
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    References listed on IDEAS

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    1. Kaur, Jasdeep & Sangal, Vikas Kumar, 2017. "Reducing energy requirements for ETBE synthesis using reactive dividing wall distillation column," Energy, Elsevier, vol. 126(C), pages 671-676.
    2. Tavan, Yadollah, 2014. "Feasibility and parametric study of tetrahydrofuran dehydration using reactive distillation with low energy requirement," Energy, Elsevier, vol. 76(C), pages 622-628.
    3. You, Xinqiang & Rodriguez-Donis, Ivonne & Gerbaud, Vincent, 2016. "Reducing process cost and CO2 emissions for extractive distillation by double-effect heat integration and mechanical heat pump," Applied Energy, Elsevier, vol. 166(C), pages 128-140.
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