(b) A saturated liquid mixture containing two components (1-propanol and ethanol) is fed in the column, onto the feed tray f, with a flow rate F and a mole fraction (or composition) of more volatile component (ethanol) Z. The overhead vapour stream with a flow rate VR and a mole fraction yR is totally condensed (not subcooled) in a total condenser and then the condensed liquid is temporarily held in the reflux drum. A fraction of this accumulated liquid is pumped back in the column as reflux stream with a flow rate R. Also, a part of the liquid is withdrawn from the reflux drum as distillate product with a flow rate D. Draw a sketch of a typical crude distillation column indicating the major sections (feed tray, rectifying section, condenser-reflux drum system, stripping section and re-boiler) to represent the above description. (3 marks) (c) Develop a compartmental distillation model for (i) Condenser-Reflux Drum System (4 marks) (ii) Rectifying Section (4 marks)