A chemical engineer selected distillation as a method of separation for liquid air in an experiment. Liquid air is fed a

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A chemical engineer selected distillation as a method of
separation for liquid air in an experiment. Liquid air is fed as
saturated feed to a continuous distillation operated at 10 atm.
Sixty % of the oxygen in the feed is to be drawn off in the bottoms
product, which is to contain 0.2 mol% nitrogen. Assuming constant
molar overflow equal to the moles of feed. Liquid air contains 20.9
mol% O2 and 79.1 mol% N2. The plate
efficiency is given as 70%.
Temperature, K
Mole-Percent N2 in Liquid
Mole-Percent in Vapour
77.35
100
100
77.98
90
97.17
78.73
79
93.62
79.44
70
90.31
80.33
60
85.91
81.35
50
80.46
82.54
40
73.50
83.94
30
64.05
85.62
20
50.81
87.67
10
31
90.17
0
0
(a) Determine the mole % N2 in the vapor from
the top plate.
(b) Which other method is suitable for the separation of
liquid air?
(c) Determine the number of equilibrium stages required