DocumentCode :
490646
Title :
Multiple Steady States in Homogeneous Azeotropic Distillation
Author :
Bekiaris, Nikolaos ; Meski, George A. ; Radu, Cristian M. ; Morari, Manfred
Author_Institution :
Chemical Engineering 210-41, California Institute of Technology, Pasadena, CA 91125
fYear :
1993
fDate :
2-4 June 1993
Firstpage :
2931
Lastpage :
2936
Abstract :
In this article we study multiple steady states in ternary homogeneous azeotropic distillation. We show that in the case of infinite reflux and an infinite number of trays, multiple steady states exist when the distillate flow varies non-monotonically along the continuation path of the bifurcation diagram with the distillate flow as the bifurcation parameter. We derive a necessary and sufficient condition for the existence of these multiple steady states based on the geometry of the distillation region boundaries. We also locate in the composition triangle the feed compositions that lead to these multiple steady states. We show that the prediction of the existence of multiple steady states in the case of infinite reflux and an infinite number of trays has relevant implications for columns operating at finite reflux and with a finite number of trays. Using numerically constructed bifurcation diagrams for specific examples, we show that these multiplicities tend to vanish for small columns and/or for low reflux flows.
Keywords :
Bifurcation; Chemical engineering; Chemical industry; Chemical technology; Electronic mail; Feeds; Geometry; Steady-state; Sufficient conditions; Temperature;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
American Control Conference, 1993
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0860-3
Type :
conf
Filename :
4793437
Link To Document :
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