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Towards energy efficient styrene distillation scheme: From grassroots design to retrofit

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  • Cui, Chengtian
  • Li, Xingang
  • Guo, Dongrong
  • Sun, Jinsheng

Abstract

The current state-of-the-art commercial styrene distillation schemes, featured by conventional distillation columns to purify styrene, are introduced with energy, exergy and economic analyses. Amongst all the procedures the separation of ethylbenzene/styrene, the critical close-boiling system, accounts for ∼65% of the total energy requirement. To improve the energetic efficiency, double-effect distillation (DED) and heat pump distillation (HPD) are suggested as competitive improvements on conventional distillation schemes (CDSs), which give birth to advanced distillation schemes (ADSs). In addition, sensitivity analysis is carried out to determine the optimal operational parameters of columns in styrene distillation process. Taking the CDSs as benchmark processes, the ADSs with DED and HPD can lower operating costs by up to 30% and 40%, respectively. The synergistic effect makes retrofit proposals' payback period very attractive, through considerably energy costs reduction and uttermost equipment reuse. In the view of total annualized cost (TAC), the ADSs can cut a corner of ∼35–40% from the CDSs. Specifically, the ADS using HPD slightly outperforms its DED counterpart in TAC comparison. Despite energetic or monetary advantage, the ADSs also show their environmental drawback of higher exergy losses than the CDSs.

Suggested Citation

  • Cui, Chengtian & Li, Xingang & Guo, Dongrong & Sun, Jinsheng, 2017. "Towards energy efficient styrene distillation scheme: From grassroots design to retrofit," Energy, Elsevier, vol. 134(C), pages 193-205.
    • Handle: RePEc:eee:energy:v:134:y:2017:i:c:p:193-205
    DOI: 10.1016/j.energy.2017.06.031
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    References listed on IDEAS

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    Cited by:

    1. Liu, Siyao & Cui, Chengtian & He, Jie & Sun, Jinsheng, 2018. "Feasibility assessment of a novel refrigeration FCC gas plant driven by self waste heat," Energy, Elsevier, vol. 145(C), pages 356-366.
    2. Cui, Chengtian & Qi, Meng & Zhang, Xiaodong & Sun, Jinsheng & Li, Qing & Kiss, Anton A. & Wong, David Shan-Hill & Masuku, Cornelius M. & Lee, Moonyong, 2024. "Electrification of distillation for decarbonization: An overview and perspective," Renewable and Sustainable Energy Reviews, Elsevier, vol. 199(C).
    3. Cui, Chengtian & Long, Nguyen Van Duc & Sun, Jinsheng & Lee, Moonyong, 2020. "Electrical-driven self-heat recuperative pressure-swing azeotropic distillation to minimize process cost and CO2 emission: Process electrification and simultaneous optimization," Energy, Elsevier, vol. 195(C).
    4. Gao, Xiaoxin & Gu, Qiang & Ma, Jiangquan & Zeng, Yifan, 2018. "MVR heat pump distillation coupled with ORC process for separating a benzene-toluene mixture," Energy, Elsevier, vol. 143(C), pages 658-665.

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