Control Properties of Alternative Schemes to Thermally Coupled Distillation Columns for Ternary Mixtures Separations (original) (raw)
The thermally coupled distillation schemes have received considerable attention because of their efficiency to reduce the energy required for the separation of multicomponent mixtures. The structure of the complex systems offers some control challenges arising from the transfer of vapor (or liquid) streams between the columns. Recently, some alternate schemes to thermally coupled distillation arrangements for the separation of ternary mixtures, that might provide better operational properties than the complex columns, have been proposed. In this work, we analyze the control properties of two alternative distillation schemes to the coupled systems. The theoretical control properties have been analyzed with the application of the singular value decomposition technique. The results indicate that a reduction in the number of interconnections of the alternate configurations does not necessarily provide an improvement of their control properties.
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