Nonlinear model reduction and control for high-purity distillation columns

Aditya Kumar, Prodromos Daoutidis

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


This article considers high-purity distillation columns with large recycle (and thus internal) flow rates. A singular perturbation analysis is employed to document a well-known observation for such columns, namely, the existence of fast and slow dynamics associated with internal and external flows, respectively. A nonlinear low-order model of the slow column dynamics, suitable for analysis and nonlinear feedback controller synthesis, is also derived. A two-tiered controller design procedure, which incorporates such a nonlinear controller, is finally proposed, and its performance and robustness characteristics are evaluated through simulations.

Original languageEnglish (US)
Pages (from-to)4495-4505
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Issue number20
StatePublished - Oct 1 2003


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