Question: 11.1 A temperature control system for a distillation column is shown in Fig. E11.1. The temperature T of a tray near the top of the

11.1 A temperature control system for a distillation column is shown in Fig. E11.1. The temperature T of a tray near the top of the column is controlled by adjusting the reflux flow rate R. Draw a block diagram for this feedback control system. You may assume that both feed flow rate F and feed composition xF are disturbance variables and that all of the instrumentation, including the controller, is pneumatic. t

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