Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

doi:10.1016/j.cjche.2022.09.018

中国化学工程学报 ›› 2023, Vol. 57 ›› Issue (5): 247-264.DOI: 10.1016/j.cjche.2022.09.018

• Full Length Article • 上一篇下一篇

Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

Kejin Huang, Shuaishuai Han, Lijing Zang, Haisheng Chen, Yihang Luo, Liang Zhang, Yang Yuan, Xing Qian, Shaofeng Wang

College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2022-05-31 修回日期:2022-08-24 出版日期:2023-05-28 发布日期:2023-07-08
通讯作者: Kejin Huang,E-mail:huangkj@mail.buct.edu.cn;Haisheng Chen,E-mail:chenhs@mail.buct.edu.cn
基金资助:
The financial support from National Natural Science Foundation of China (21878011) is acknowledged.

Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

Kejin Huang, Shuaishuai Han, Lijing Zang, Haisheng Chen, Yihang Luo, Liang Zhang, Yang Yuan, Xing Qian, Shaofeng Wang

College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China

Received:2022-05-31 Revised:2022-08-24 Online:2023-05-28 Published:2023-07-08
Contact: Kejin Huang,E-mail:huangkj@mail.buct.edu.cn;Haisheng Chen,E-mail:chenhs@mail.buct.edu.cn
Supported by:
The financial support from National Natural Science Foundation of China (21878011) is acknowledged.

摘要/Abstract

摘要： For dividing-wall distillation columns (DWDCs) separating a heavy-component dominated and wide boiling-point ternary (HCDWBT) mixture, a significant amount of excessive heat exists inevitably in stripping the heavy-component from the intermediate-component and it can be employed to initiate the development of vapor recompression heat pump (VRHP) assisted DWDC (VRHP-DWDC). Despite dividing wall may locate in the top, middle, and bottom, the optimum VRHP-DWDC is found to involve uniformly-two VRHP circles. While the first one serves to compress and transform the excessive heat resulted from the separation of the heavy-component from the intermediate-component, the second one to compress and transform the overhead vapor stream of the light-component pre-heated sequentially with the condensate from the first one and the bottom product stream of the heavy-component, both releasing the temperature-elevated latent heat to the pre-fractionator’s or common stripping section. The processing of two HCDWBT mixtures of benzene/toluene/o-xylene and n-pentane/n-hexane/n-heptane are selected to assess the derived optimum topological configurations of the VRHP-DWDC and their optimality is confirmed through detailed comparisons with the DWDC and two VRHP-DWDCs involving only one VRHP circle. The proposed strategy helps to tap the full potential of the VRHP-DWDC with considerably alleviated complication in process development.

关键词: dividing-wall distillation columns, Heavy-component dominance, Vapor recompression heat pump, Process development, Economic behavior

Abstract: For dividing-wall distillation columns (DWDCs) separating a heavy-component dominated and wide boiling-point ternary (HCDWBT) mixture, a significant amount of excessive heat exists inevitably in stripping the heavy-component from the intermediate-component and it can be employed to initiate the development of vapor recompression heat pump (VRHP) assisted DWDC (VRHP-DWDC). Despite dividing wall may locate in the top, middle, and bottom, the optimum VRHP-DWDC is found to involve uniformly-two VRHP circles. While the first one serves to compress and transform the excessive heat resulted from the separation of the heavy-component from the intermediate-component, the second one to compress and transform the overhead vapor stream of the light-component pre-heated sequentially with the condensate from the first one and the bottom product stream of the heavy-component, both releasing the temperature-elevated latent heat to the pre-fractionator’s or common stripping section. The processing of two HCDWBT mixtures of benzene/toluene/o-xylene and n-pentane/n-hexane/n-heptane are selected to assess the derived optimum topological configurations of the VRHP-DWDC and their optimality is confirmed through detailed comparisons with the DWDC and two VRHP-DWDCs involving only one VRHP circle. The proposed strategy helps to tap the full potential of the VRHP-DWDC with considerably alleviated complication in process development.

Key words: dividing-wall distillation columns, Heavy-component dominance, Vapor recompression heat pump, Process development, Economic behavior

Kejin Huang, Shuaishuai Han, Lijing Zang, Haisheng Chen, Yihang Luo, Liang Zhang, Yang Yuan, Xing Qian, Shaofeng Wang. Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency[J]. 中国化学工程学报, 2023, 57(5): 247-264.

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Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

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