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In fact, to this day, I have not seen how to calculate the content of the gas exiting the tower in ammonia synthesis. There is a ton of information available on the hydrogen-nitrogen synthesis equilibrium, but in fact, ammonia plants don’t need it. What interests ammonia synthesis plants is the ammonia content at the exit of the tower and the net ammonia value, but there is no method for calculating the ammonia content at the exit of the tower. Did I say that? If there is a calculation method, I hope everyone can provide it. Advanced parameters include feed temperature, pressure, space velocity, hydrogen and nitrogen partial pressures, inert gas partial pressures, and ammonia partial pressure at the inlet to the tower. Add another coefficient—representing the structure of the synthesis tower and the properties of the catalyst. At the very least, it is necessary to figure out how to determine the ammonia content in the gas leaving the tower, once the air velocity, hydrogen and nitrogen partial pressures, inert gas partial pressures, and ammonia partial pressure entering the tower have been established. The presence of inert gases gives an approximate formula for the equilibrium in hydrogen-nitrogen synthesis; but is it the same proportion as the ammonia content in the gas leaving the tower? The content of ammonia entering the tower is generally only described qualitatively, and I suspect it is incorrect. It is true that a lower ammonia content in the gas entering the tower reduces the synthesis rate and the net amount of ammonia produced; however, the ammonia content in the gas exiting the tower should increase slightly! What exactly is their relationship? Thank you all for the discussion!