Performance of an Internally Heat-Integrated Distillation Column (HIDiC) in Separation of Ternary Mixtures

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  • Iwakabe Koichi
    Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • Nakaiwa Masaru
    Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Huang Kejin
    Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Nakanishi Toshinari
    R&D Department, Kimura Chemical Plants Co., Ltd.
  • Røsjorde Audun
    Department of Chemistry, Faculty of Natural Science and Technology, Norwegian University of Science and Technology
  • Ohmori Takao
    Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Endo Akira
    Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yamamoto Takuji
    Energy-Efficient Chemical Systems Group, Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)

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Abstract

This paper reports on the performance of an internally Heat-Integrated Distillation Column (HIDiC) in separation of ternary mixtures. Separation of two ternary mixtures, benzene–toluene–p-xylene and n-pentane–cyclopentane–2-methylpentane, are studied to determine the effect of the span of boiling points on the performance and the energy savings of the HIDiC. For the former mixture, the HIDiC consumes about 30% less energy than a conventional distillation column, while for the latter mixture, even a higher degree of about 50% reduction of energy consumption is achieved. Although the efficiency of the HIDiC depends heavily upon the mixtures to be separated, it has been found that the HIDiC can be a very efficient alternative for the separation of ternary mixtures provided the span of boiling points is narrow enough to allow feasible application of heat pump techniques. The internal heat integration design and system performance were also evaluated by sensitivity analysis.

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