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ive been given a problem and ive worked most of it out but im not sure whether my answer for the feed line (q) is correct can i get somebody to re assure me on how to plot it onto the graph and get it correctly. heres the question below.

A mixture containing 40 mole% heptane and 60 mole% octane is to be separated in a distillation column operating at a pressure of 1 bar. The distillate and the bottom product will contain 97 mole% heptane and 4 mole% heptane respectively. The feed rate will be 200 kmol h-1. The feed will be a mixture of 85% liquid at its boiling point and 15% saturated vapour. A reflux ratio of 2.1 is to be used. The plate efficiency is 75%.

Using the given information, determine:

(i) the top and bottom flowrates [kmol h-1],

which i found to be W= 122.58 and D= 78.42

(ii) the number of actual plates required for the separation using the McCabe Thiele graphical method,

i got 13 stages from the graph but i dont know if its right because i dont know if my q is right and im not sure how to exactly plot it on the graph. so then i get actual plates to be 18

(iii) the minimum reflux ratio, and

i got this to be 1.62

(iv) the number of stages at total reflux.

i think its N+1 which is 13+1 so 14

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# Distillation question need help on finding q!

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