Feed to distillation columns are normally saturated liquids (at boiling point). The relationship between feed, vapour and liquid flowrates of the top and bottom sections of the column is given by: L=L+F and V=V Discuss the relationship between feed ( F), vapour and liquid flowrates (L,L,V,V) of the top and bottom sections of the column if the feed is: i. Subcooled liquid. (2.5 marks) ii. Partially vapourised feed (2.5 marks) iii. Saturated vapour. (2.5 marks) iv. Superheated vapour. (2.5 marks)