Hello guys,
differentiate between vapourisation and evaporation

vapourisation can occur from solid or liquid into a gas but evaporation is straight from a liquid and is often below boiling temperature while vapourisation is often above boiling temperature

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .