Different operational policies for the batch extractive distillation

P. Lang, Z. Lelkes, P. Moszkowicz, M. Otterbein, H. Yatim

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20 Citations (Scopus)


In our former papers the batch extractive distillation (BED) was investigated under constant reflux ratio (R=const.). In a BED process the mole fraction of the more volatile component (MVC) in the distillate xd,A can be influenced not only by the variation of R but also by changing the flow rate of the solvent (F). Several operational policies were developed, and these policies were studied by simulation (on the example of the mixture acetone-methanol + water) and compared. The xd,A=const. policies gave lower recoveries than the original R=const. policy. This latter policy was modified by shortening the second preparatory step of the BED (R=∞, F≫0). The effectiveness of this modified policy was also experimentally verified. Finally this modified R=const. policy was combined with the xd,A=const. policy maintaining a high value of xd,A for a longer period during the production of the MVC by gradually increasing R or F or R and F simultaneously.

Original languageEnglish
Pages (from-to)645-650
Number of pages6
JournalComputers and Chemical Engineering
Issue numberSUPPL. 1
Publication statusPublished - Jan 1 1995



  • batch extractive distillation
  • operational policies, simulation
  • pilot-plant experiment
  • rectification

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications

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