pestane in the distillate and $05\%$ thenexane th the bitum produt.

a$)$ Calculace the minumum number of plines,

b$)$ Calculate the minimuma relliux ratio.

c$)$ Detemine the number of plates for $R^{\text{'}}=1,2^{\text{'}}$ Rimin

i$)$ feed is saturted vapor.

i$)$ Feed is s$$turated tiguid,

d$)$ Discuss nift rhe resilts