Fertiliser Technology
In the manufacture of H₃ PO₄ (ortho), ; strong H₂ SO₄ leaching wet process as compared to electric furnace process

Produces lower purity acid
Is very costly
Uses lower grade phosphate rock
Requires lower capital investment in the plant

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Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

Rate of reaction is very low
Very high pressure is required resulting in costly pressure vessel
None of these
Space velocity of gas is very low resulting in decreased conversion

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