Study on conditions for existence of Multiple steady states in Homogeneous Azeotropic Distillation
Abstract
Azeotropic distillation is one of the most widely used and important separation processes in the chemical and the specialty chemical industries. However, operation of azeotropic distillation columns may raise new questions and problems. Among their questions and problems, it has been discovered that such columns can exhibit multiple steady states, i.e. two or more steady states with different composition and temperature profiles which correspond to the same set of operating parameters. Multiple steady states may cause problems in column operation and control. When two or more steady states exist for the same inputs, it is possible that while operating at the desirable steady state some disturbances or changes of operating conditions push the column profile to another undesirable steady state or result (e.g. to the lower product purity)
In this article, we study the effects of the most important operating parameters on the existence of multiple steady states in azeotropic distillation columns. Based on the simulation results, we present a systematic procedure which determines whether multiplicities exist for any azeotropic distillation column, and how to choose the column operating conditions to avoid the existence of multiplicities.
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