Fertiliser Technology
Reaction of nitric acid and sulphuric acid with phosphate rock produces

Tricresyl phosphate
Nitrophosphate
Tributyl phosphate
Diammonium phosphate

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Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

High cost of the high pressure vessel used for the reactor
Higher pumping cost
Comparatively higher pressure drop
Chances of entrainment and disturbance of catalyst bed

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