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Dynamics of homogeneous azeotropic distillation columns

Andersen, Henrik W. and Laroche, Lionel and Morari, Manfred (1991) Dynamics of homogeneous azeotropic distillation columns. Industrial & Engineering Chemistry Research, 30 (8). pp. 1846-1855. ISSN 0888-5885. doi:10.1021/ie00056a026.

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The dynamics of azeotropic distillation columns are significantly more complicated than those of simple binary columns. For changes in the internal flows, we initially observe a response in overall separation with a time constant that is similar to the one observed in binary distillation. However, we also observe a slow time-constant response, which is due to changes in the relative amount of entrainer in the extractive section. The fact that the gains for these two effects have different signs causes overshoot and, depending on the operating point, may also cause inverse responses with significant time constants. None of these phenomena are observed in binary distillation. They can be modeled by a simple second-order model. We also examine the open-loop dynamics for configurations aimed at dual-composition control. Just as in binary distillation there is a "high gain direction" that is obtained for changes in the external flows. The dynamics of this direction are hardly affected by changes in the operating point. The "low gain direction" is obtained for changes in the internal flows, just as in binary distillation, and also for changes in the entrainer feed flow rate. The properties of this direction change significantly with the operating point. For some operating points we observe overshoot and for others multivariable right-half-plane transmission zeros not observed in binary distillation.

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Additional Information:© 1991 American Chemical Society. Received for review January 31, 1991. Accepted April 29, 1991. We are thankful to Prof. Doherty and his students at the University of Massachusetts at Amherst, for discussions and for providing thermodynamic data and source code for the bubble point evaluation. We acknowledge use of the sparse matrix solver from Harwell (Hopper, 1981). Financial support from the Danish Research Council and Rhône Poulenc are gratefully acknowledged.
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Danish Research CouncilUNSPECIFIED
Issue or Number:8
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Official Citation:Dynamics of homogeneous azeotropic distillation columns Henrik W. Andersen, Lionel Laroche, and Manfred Morari Industrial & Engineering Chemistry Research 1991 30 (8), 1846-1855 DOI: 10.1021/ie00056a026
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86604
Deposited By: George Porter
Deposited On:24 May 2018 23:22
Last Modified:15 Nov 2021 20:40

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