• The distillation column shown in figure 1, is used to distillate a binary mixture. The symbols x, y and z denote the molar fractions of the more volatile component, while B, D, R and F represent molar flows. It is intended to control the distillate composition y despite the occurrence of disturbances in the feed flow F. All flow rates can be measured and manipulated with the exception of F which can only be measured. A composition analyzer provides the measurement of y. a) Propose a feedback control configuration and sketch the schematic diagram