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

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

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Fertiliser Technology
The composition of fresh feed to the high temperature, high pressure urea autoclave is

Excess liquid ammonia and compressed CO₂ gas
Liquid ammonia and excess compressed CO₂
Compressed ammonia gas and excess compressed CO₂
Excess liquid ammonia and liquefied CO₂

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