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“Optimal operation of Petlyuk distillation: Steady-state behavior”

Authors: Ivar J. Halvorsen and Sigurd Skogestad,
Affiliation: SINTEF and NTNU, Department of Chemical Engineering
Reference: 2001, Vol 22, No 3, pp. 153-187.

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Keywords: self optimizing control, distillation

Abstract: The 'Petlyuk' or 'dividing-wall' or 'fully thermally coupled' distillation column is an interesting alternative to the conventional cascaded binary columns for separation of multi-component mixtures. However, the industrial use has been limited, and difficulties in operation have been reported as one reason. With three product compositions controlled, the system has two degrees of freedom left for on-line optimization. We show that the steady-state optimal solution surface is quite narrow, and depends strongly on disturbances and design parameters. Thus it seems difficult to achieve the potential energy savings compared to conventional approaches without a good control strategy. We discuss candidate variables which may be used as feedback variables in order to keep the column operation close to optimal in a 'self-optimizing' control scheme.

PDF PDF (3981 Kb)        DOI: 10.4173/mic.2001.3.3





References:
[1] CHRISTIANSEN, A.C. SKOGESTAD, S. (1997). Energy savings in integrated Petlyuk arrangements, Importance of using the preferred separation, AIChE Annual meeting, Los Angeles, November 1997. Paper 199d, updated version as found in CHRISTIANSEN.1997.
[2] CHRISTIANSEN, A.C. (1997). Studies on optimal design and operation of integrated distillation arrangements, PhD thesis 1997: 149, Norwegian University of Science and Technology.NTNU.
[3] FIDKOWSKI, Z. KROLIKOWSKI, L. (1986). Thermally coupled system of distillation columns: optimization procedure, AlChE Journal, Vol. 32, No. 4.
[4] HALVORSEN, I.J. (2001). Minimum Energy Requirements in Complex Distillation Arrangements, NTNU Dr. Ing. Thesis, 2001:43. Available from http://kikp.chembio.ntnu.no/thesis/download/200l/halvorsen/.
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[8] WOLFF, E., SKOGESTAD, S. HAVRE, K. (1994). Dynamics and Control of Integrated Three-product, Petlyuk Distillation Columns. ESCAPE´4, Dublin.
[9] WOLFF, E. SKOGESTAD, S. (1996). Operation of integrated three-product, Petlyuk distillation columns. Ind. Eng. Chem. Res., 34, 2094-2103 doi:10.1021/ie00045a018


BibTeX:
@article{MIC-2001-3-3,
  title={{Optimal operation of Petlyuk distillation: Steady-state behavior}},
  author={Halvorsen, Ivar J. and Skogestad, Sigurd},
  journal={Modeling, Identification and Control},
  volume={22},
  number={3},
  pages={153--187},
  year={2001},
  doi={10.4173/mic.2001.3.3},
  publisher={Norwegian Society of Automatic Control}
};

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