The pure N2(g) needed for the ammonia synthesis reaction will be taken from the

Question

The pure N2(g) needed for the ammonia synthesis reaction will be taken from the air. This is done with an air liquifaction plant, which is sort of the reverse of a distillation column. Suggest a way that this might work, based on your knowledge of phase equilibria. To do this, first consider air to be made up of only N2 (78 mole %), O2 (21%) and Ar (1%), and estimate the mole fractions of each in both the liquid and gas phases if 1 mole of air at 300 K and 4 atm. total pressure were cooled to 65 K in the same volume. (Assume Raoult’s law: Ch. 9.)

Air Nitrogen ?jtor _... . - Air liquefction plant Compressor Converter (Reate Hydrogen O Reverse system Liquid ammonia storage Generator rectifier tet Separator 7 C Turbine Warm water 28.3 water DIDE 10 Evaporator 4,4 Figure 12. Ocean thermal energy conversion-ammonia plant-ship. Courtesy of Johns Hopkins University's Applied Physics Laboratory

Explanation / Answer

in gas phase,

X(N2) = .78, X(O2) = .21, X(Ar) = .01

in liquid phase,

mole fractions will be same as that of gas phase

now apply haeber's process of ammonia synthesis.

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