Fertiliser Technology
In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

All of these
CaSO₄ .½H₂O and CaSO₄ crystals
Metaphosphoric acid
Pyrophosphoric acid

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Fertiliser Technology
I argest capacity nitrogenous fertiliser plants (2700 tons of NH₃ per day) (2 Nos) in India are located at

Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat)
Haldia (W.B) and Namrup (Assam) both under HFC
Talchar (Orissa) and Ramagundam (A.P.) both under FCI
Korba (M.P.) and Talchar (Orissa) both under FCI

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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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