Comparison of integrated and coupled distillation schemes using different utility prices

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Separation of a ternary mixture by different distillation schemes was simulated rigorously at steady state. Conventional schemes, heat integrated schemes, and the fully thermally coupled structure (Petlyuk system) have been optimized over total annual cost including two different regional utility price systems (high and low utility prices): The results show that price ratios have considerable effect on the savings and consequently on the optimal schemes. Using low utility price the number of actual trays is reduced and the reflux ratios will be increased. At extreme high utility prices the Petlyuk system can be justified as one of the best schemes in savings, but not against the sloppy forward heat integrated scheme. The maximum savings in total annual cost in both cases are about 28 %.

Original languageEnglish
Pages (from-to)S799-S802
JournalComputers and Chemical Engineering
Issue numberSUPPL. 1
Publication statusPublished - Jun 1 1999



  • Coupling
  • Distillation
  • Energy integration
  • Petlyuk configuration

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications

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