NONLINEAR QUALITY CONTROL OF PSEUDO-BINARY DISTILLATION COLUMNS

We are interested in the quality control of pseudo-binary distillation columns. The objective is to maintain the compositions of the distillate and the bottom product at their specifications, by acting on the reflux flowrate and the reboiler duty, the quality of the feed being unknown. The specifications may be changed. To achieve this objective, we adapt the nonlinear method developed earlier for binary columns via qualitative considerations on the dynamics of pseudo-binary distillation columns. The case of a refinery debutanizer is presented. On-line data show the validity and efficiency of this adaptation1.

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