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Process Control: Modeling, Design, and Simulation by B. Wayne Bequette

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M13.1. Description of Distillation Control

A schematic diagram of a typical binary distillation column control strategy is shown in Figure M13-1. Notice that there are five measured variables (pressure, distillate receiver level, base level, distillate composition, and bottoms composition) and five manipulated variables (condenser heat duty, reflux flow rate, distillate flow rate, bottoms flow rate, and reboiler heat duty). In addition, if the feed to the column is regulated, then there is an additional measurement (feed flow rate) and manipulated input (also feed flow rate or valve position). Normally, it is assumed that the pressure is controlled by manipulating the condenser heat duty (or the flow of cooling water to the condenser), that the ...

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