d) A continuous rectifying column handles a mixture consisting of 40 per cent of benzene (C6H6) by mass and 60 per cent of toluene (C,H3) at the rate of 4 kg/s, and separates it into a product containing 97 per cent of benzene and a liquid containing 98 per cent toluene. The feed is liquid at its boiling-point. The equilibrium data is given in the table below. Mole fraction of Benzene in liquid Mole fraction of Benzene in vapour 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.22 0.38 0.51 0.63 0.70 0.78 0.85 0.91 0.96 i) Calculate the mass flows of distillate and waste liquor. ii) If a reflux ratio of 3.5 is employed, how many plates are required in the rectifying part of the column? [3 marks] [7 marks] iii) On which ideal tray should the feed be introduced [1.5 marks] iv) If the efficiency is 60 per cent, calculate the number of actual plates [1 marks] v) If the tray spacing is suggested to be 1.25m, Determine the height of the column required [1 marks]