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Decanter Anomaly


Correspondence concerning this article should be addressed to W. L. Luyben at


A counter-intuitive decanter level control structure was reported in an earlier article which the aqueous level controller had to use reverse action for stable control. The Aspen model used in this study was the simple Decanter model, which assumes that there are only two liquid phases and pressure remains constant. This article presents results when the alternative Flash3 model is used. The aqueous level controller with direct action works well. © 2012 American Institute of Chemical Engineers AIChE J, 59: 2088–2095, 2013