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structure the FCetoh flow controller is on cascade. Note also that the output signal of composition controller CCetoh is the ratio of the flowrates of the ethanol feed and the C4 feed (707/1767 = 0.4).

Results for disturbances in throughput are provided in Figure 15.18. At 0.2 h, step changes in the setpoint of the C4 feedflow controller are made. The solid lines are for

Feed Flowrate Disturbances

Feed Flowrate Disturbances

+L

^C4

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