Abstract

MARTINEZ-CISNEROS, J. et al. Dynamic behavior of alternate schemes to petlyuk column (dividing wall column) for separation of ternary mixtures. Rev. Mex. Ing. Quím [online]. 2009, vol.8, n.1, pp.135-144. ISSN 1665-2738.

Thermally coupled distillation systems have been proposed to perform distillation separation tasks with the incentive of achieving lower energy consumption levels with respect to conventional distillation sequences. The structure of the complex systems offers some control challenges arising from the transfer of vapor (or liquid) streams between the columns. In particular, the presence of recycle streams in the coupled schemes has influenced the notion that control problems might be expected during the operation of those systems with respect to the rather well-known behavior of conventional distillation sequences. That has been one of the main reasons for the lack of industrial implementation of thermally coupled distillation schemes. Recently, some alternate schemes to Petlyuk column have been proposed. In this work, we analyze the control properties of two alternative distillation schemes to the Petlyuk column. The dynamic behavior is analyzed using the technique of singular value decomposition and rigorous dynamic simulations. The results indicate that alternate structures show better control properties than traditional Petlyuk structure.

Keywords : Petlyuk column; control properties; energy savings; alternative sequences; design.