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Exercise 3 (35 points) The distillation column shown in below is used to distill a binary mixture. Symbols x, y, and z denote mole fractions of the more volatile component of the mixture, while B, D, R, and F represent molar flow rates. (The top stream exiting the column is split to D and R.) It is desired to control distillate (D) composition y despite disturbances in feed flow rate. All flow rates can be measured and manipulated with the exception of F, which can only be measured. A composition analyzer provides measurements of y. (a) Propose a feedback control method and sketch the schematic diagram. (b) Suggest a feedforward control method and sketch the schematic diagram. R D. Y F.2 JO- 3 EC m Tex