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I.J. Halvorsen and S. Skogestad, ``Improved analysis and understanding of the Petlyuk distillation column'', AIChE Annual Meeting, Dallas, 1-5 Nov. 1999.

Abstract.
The Petlyuk (Petlyuk 1965) arrangement for separation of a ternary mixture into three pure product streams has the potential of 20-50% energy savings compared to conventional distillation sequences. However, very few are in industrial use. The reasons for this have been listed as lack of established design procedures and difficulties in control. In this paper, the minimum energy requirement have been analyzed for columns with infinite number of stages.