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Figure 12.2 Composition profiles.

vapor flowrate because there is no distillate. In the column base, the total liquid entering is the liquid coming from tray 1, which is the bottoms plus the vapor boilup.

The following sections explore three alternative control structures. The primary objective is to maintain the specified purity of the bottoms product at 98 mol% C in the face of disturbances in production rate and feed compositions.

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