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Multiple Steady States in Distillation:  ∞/∞ Predictions, Extensions, and Implications for Design, Synthesis, and Simulation

Bekiaris, Nikolaos and Morari, Manfred (1996) Multiple Steady States in Distillation:  ∞/∞ Predictions, Extensions, and Implications for Design, Synthesis, and Simulation. Industrial & Engineering Chemistry Research, 35 (11). pp. 4264-4280. ISSN 0888-5885. http://resolver.caltech.edu/CaltechAUTHORS:20180524-154556596

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Abstract

Bekiaris et al. (1993, 1996) presented a thorough study of the existence of multiple steady states in homogeneous and heterogeneous ternary azeotropic distillation based on the analysis of the case of infinite reflux and an infinite number of trays (∞/∞ case). In this paper, first we show how the ∞/∞ analysis and predictions can be extended to quaternary mixtures. Next, the implications of these multiplicities for column design, synthesis, and simulation are demonstrated. More specifically, we show how the ∞/∞ predictions can be useful for the selection of the entrainer, the equipment, and the separation scheme. We show that, in some cases, the column operation at an unstable steady state may have some advantages. The important issue of the effect of the thermodynamic phase equilibrium on the existence of multiplicities is discussed. Using the ∞/∞ analysis, we identify entire mixture classes for which multiplicities are inherent and robust. Mixtures with ambiguous VLE data are studied; we show that in some cases a slight VLE difference between models and/or experimental data may affect the existence of multiplicities while other, major VLE discrepancies do not. Finally, we identify the key issues and the pitfalls one should be cautious about when designing or computing the composition profile of an azeotropic distillation column with a commercial simulator.


Item Type:Article
Related URLs:
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https://dx.doi.org/10.1021/ie950450dDOIArticle
Additional Information:© 1996 American Chemical Society. Received for review July 20, 1995. Revised manuscript received June 28, 1996. Accepted June 28, 1996. We gratefully acknowledge the financial support of the donors of the Petroleum Research Fund, administered by the American Chemical Society, and of the I. S. Latsis Foundation.
Funders:
Funding AgencyGrant Number
American Chemical Society Petroleum Research FundUNSPECIFIED
I. S. Latsis FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20180524-154556596
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180524-154556596
Official Citation:Multiple Steady States in Distillation:  ∞/∞ Predictions, Extensions, and Implications for Design, Synthesis, and Simulation Nikolaos Bekiaris and Manfred Morari Industrial & Engineering Chemistry Research 1996 35 (11), 4264-4280 DOI: 10.1021/ie950450d
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86603
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 May 2018 23:20
Last Modified:24 May 2018 23:20

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