Fertiliser Technology
Commercial production of hydrogen for the manufacture of nitrogeneous fertilisers is done by

Steam reforming of naphtha and cracking of natural gas
All of these
Cryogenic separation of hydrogen from coke oven gas
Electrolysis of water

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

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

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