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Minimizing the entropy production in a chemical process for dehydrogenation of propane

Author

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  • Røsjorde, A.
  • Kjelstrup, S.
  • Johannessen, E.
  • Hansen, R.

Abstract

We minimize the total entropy production of a process designed for dehydrogenation of propane. The process consists of 21 units, including a plug-flow reactor, a partial condenser, two tray distillation columns and a handful of heat exchangers and compressors. The units were modeled in a manner that made them relatively insensitive to changes in the molar flow rates, to make the optimization more flexible. The operating conditions, as well as to some degree the design of selected units, which minimized the total entropy production of the process, were found. The most important variables were the amount of recycled propane and propylene, conversion and selectivity in the reactor, as well as the number of tubes in the reactor. The optimal conversion, selectivity and recycle flows were results of a very clear trade-off among the entropy produced in the reactor, the partial condenser and the two distillation columns. Although several simplifying assumptions were made for computational reasons, this shows for the first time that it is also meaningful to use the entropy production as an objective function in chemical engineering process optimization studies.

Suggested Citation

  • Røsjorde, A. & Kjelstrup, S. & Johannessen, E. & Hansen, R., 2007. "Minimizing the entropy production in a chemical process for dehydrogenation of propane," Energy, Elsevier, vol. 32(4), pages 335-343.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:4:p:335-343
    DOI: 10.1016/j.energy.2006.07.013
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    References listed on IDEAS

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    1. de Koeijer, Gelein & Johannessen, Eivind & Kjelstrup, Signe, 2004. "The second law optimal path of a four-bed SO2 converter with five heat exchangers," Energy, Elsevier, vol. 29(4), pages 525-546.
    2. Toffolo, A. & Lazzaretto, A., 2002. "Evolutionary algorithms for multi-objective energetic and economic optimization in thermal system design," Energy, Elsevier, vol. 27(6), pages 549-567.
    3. Johannessen, Eivind & Kjelstrup, Signe, 2004. "Minimum entropy production rate in plug flow reactors: An optimal control problem solved for SO2 oxidation," Energy, Elsevier, vol. 29(12), pages 2403-2423.
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