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Fertiliser Technology

Fertiliser Technology
Raw materials for urea production are

NH₃ and CO
HNO₃ and CaCO₃
CO₂ and N₂
CO₂, H₂ and N₂

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Fertiliser Technology
Dehydration of ammonium carbamate produces

None of these
Biuret
Urea
Ammonia water

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Fertiliser Technology
Sodium tri poly phosphate (STPP) is chemically represented as

Na₅P3O₁₀
Na₃P4O₆
Na₄P3O₈
Na₂PO₄

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Fertiliser Technology
Temperature and pressure in urea autoclave is

120°C and 300 atm
200°C and 10 atm
190°C and 200 atm
400°C and 550 atm

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Fertiliser Technology
Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it

Vaporises at normal temperature
Has a pungent smell
Is in short supply
Is toxic and highly corrosive

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Fertiliser Technology
Temperature and pressure in ammonia converter is

450 atm, 550°C
450 atm, 1000°C
200 atm, 1000°C
450 atm, 200°C

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