Fertiliser Technology
Phosphoric acid is produced in wet process from phosphate rock and

Concentrated H₂SO₄
Concentrated NHO₃
Dilute H₂SO₄
Concentrated HCl

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

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