A temperature control system for a distillation column is shown in figure. The temperature T of a

Question:

A temperature control system for a distillation column is shown in figure. 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 variable and that all of the instrumentation, including the controller, ispneumatic.