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Optimisation of the higher pressure of pressure-swing distillation of a maximum azeotropic mixture

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  • Hegely, Laszlo
  • Lang, Peter

Abstract

The pressure-swing distillation separation of a maximum azeotropic mixture, water-ethylenediamine, is simulated and optimised. In contrast to our previous works, the top pressure of the high-pressure column (HPC) is considered as an optimisation variable. The total annual cost (TAC) is minimised first without heat integration (NHI), then different energy demand reduction options are applied and optimised: partial (PHI) and full (FHI) heat integration and vapour recompression (VRC) heat pumps. For heat pumps, working fluid flow rate is optimised to minimise the work and thus the compressor costs. Environmental impacts are also considered by calculating CO2 emissions and Eco-indicator 99 (EI99) values. The application of HI does not significantly change the pressure optimum. The lowest TAC is obtained by the optimal PHI, which decreases TAC by 16% compared to the optimal NHI process. Applying VRC is uneconomical, but very favourable environmentally: CO2 emissions and EI99 are reduced by 44 and 95%, respectively.

Suggested Citation

  • Hegely, Laszlo & Lang, Peter, 2023. "Optimisation of the higher pressure of pressure-swing distillation of a maximum azeotropic mixture," Energy, Elsevier, vol. 271(C).
    • Handle: RePEc:eee:energy:v:271:y:2023:i:c:s036054422300333x
    DOI: 10.1016/j.energy.2023.126939
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    References listed on IDEAS

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    1. Shi, Pengyuan & Zhang, Qingjun & Zeng, Aiwu & Ma, Youguang & Yuan, Xigang, 2020. "Eco-efficient vapor recompression-assisted pressure-swing distillation process for the separation of a maximum-boiling azeotrope," Energy, Elsevier, vol. 196(C).
    2. Ferchichi, Mariem & Hegely, Laszlo & Lang, Peter, 2022. "Economic and environmental evaluation of heat pump-assisted pressure-swing distillation of maximum-boiling azeotropic mixture water-ethylenediamine," Energy, Elsevier, vol. 239(PE).
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    Cited by:

    1. Zhai, Jian & Xie, Hongfei & Chen, Xin & Peng, Zekong & Sun, Qingbo & Li, Jinwen, 2024. "Design and energy-saving strategy of sustainable pressure-swing distillation with thermally and electrically coupled intensification for separating ternary mixture with multiple azeotropes," Energy, Elsevier, vol. 295(C).
    2. Stanislav Boldyryev & Mariia Ilchenko & Goran Krajačić, 2024. "Improving the Economic Efficiency of Heat Pump Integration into Distillation Columns of Process Plants Applying Different Pressures of Evaporators and Condensers," Energies, MDPI, vol. 17(4), pages 1-33, February.
    3. Yu, Azhi & Ye, Qing & Li, Jinlong & Li, Xinhao & Wang, Yao & Rui, Qingqing, 2024. "Economic, environmental, energy, exergy (4E) analysis and simulated annealing algorithm optimization of dividing-wall column-intensified heterogeneous azeotropic pressure-swing distillation process," Energy, Elsevier, vol. 296(C).

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