2. The distillation column shown in the drawing 1 is used to distill binary mixture. Symbols x, y and z denote mole fraction 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 sketch the schematic diagram. (b) Suggest a feedforward control method and sketch the schematic diagram. F, z COLUMN B, x R D, y Drawing 1