Fertiliser Technology
Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of

Triple superphosphate
Phosphoric acid
Phosphorous
Superphosphate

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

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

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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

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

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