https://scholars.lib.ntu.edu.tw/handle/123456789/445360
標題: | Energy-efficient heterogeneous extractive distillation system for the separation of close-boiling cyclohexane/cyclohexene mixture | 作者: | Yi, C.-C. Huang, W.-C. Chien, I.-L. I-LUNG CHIEN |
關鍵字: | Close boiling; Cyclohexane/cyclohexene separation; Extractive distillation; Heterogeneous azeotropic distillation; Process design | 公開日期: | 2018 | 卷: | 87 | 起(迄)頁: | 26-35 | 來源出版物: | Journal of the Taiwan Institute of Chemical Engineers | 摘要: | Cyclohexane and cyclohexene are close-boiling compounds with relative volatility extremely close to unity, thus, separation via conventional distillation is impractical. In this paper, an energy-efficient heterogeneous extractive distillation system using ethylene glycol as heavy entrainer is proposed. By adding ethylene glycol into the system, large liquid-liquid envelope will form. However, the principle of separation is not exclusively the formation and split of heterogeneous azeotrope like that of a typical heterogeneous azeotropic distillation process, but also because of ethylene glycol greatly enhances the relative volatility of cyclohexane over cyclohexene when treated as a heavy entrainer. The proposed heterogeneous extractive distillation column includes a top decanter and no rectifying section. After establishing the base design of the proposed system, energy-saving schemes are also suggested to further reduce the total annual cost and the annual operating cost. The results show that the proposed heterogeneous extractive distillation system with a process-to-process heat exchanger has the predominant benefit of the lowest total annual cost. To compare the optimal result of this design flowsheet with a recently published separation method utilizing two reactive-distillation columns, our proposed design is much more economical with 61.4% savings in total annual cost and 64.6% savings in annual operating cost. © 2018 Taiwan Institute of Chemical Engineers |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/445360 | DOI: | 10.1016/j.jtice.2018.03.042 | SDG/關鍵字: | Costs; Cyclohexane; Distillation; Energy conservation; Energy efficiency; Ethylene; Ethylene glycol; Operating costs; Polyols; Process design; Annual operating costs; Close-boiling; Energy saving schemes; Extractive distillation; Extractive distillation systems; Heterogeneous azeotropic distillation; Process heat exchangers; Reactive distillation columns; Distillation columns |
顯示於: | 化學工程學系 |
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