Q3: The distillation column shown in the figure below is used to distill a binary mixture. Symbols x, y, z denote mole fractions of the more volatile component, while B, D, R, and F represent molar flow rates. It is desired to control distillate composition y despite disturbances in feed flow rate F. 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 show the sketch in a figure. (b) Propose a feedforward control method and show the sketch in a figure. (c) Identify the controlled variable and the manipulated variable(s) in each control method above. 0 F. z U m n B, x R -D, y