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Fertiliser Technology

Fertiliser Technology
Temperature and pressure in ammonia converter is

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

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Fertiliser Technology
Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

Increased biuret formation
All of these
Increased cost of equipment
High corrosion rate

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Fertiliser Technology
Urea is formed only

At very high temperature
In liquid phase
At very low pressure (vacuum)
In vapour phase

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Fertiliser Technology
Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

Improving the strength & heat resistance
Increasing the effectiveness
Stabilisation
All of these

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Fertiliser Technology
With increases in pressure, the conversion of ammonium carbamate into urea

Can either increase or decrease depends on biuret content
Increases
Decreases
Remains unaltered

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Fertiliser Technology
Chemical formula of biuret is

NH₃.COO.NH₃
NH₄COONH₂
NH₂.CO.NH₂
NH₂CONHCONH₂

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