Fertiliser Technology - Chemical Engineering Questions and Answers

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Chemical formula of biuret is

NH₂.CO.NH₂

NH₃.COO.NH₃

NH₂CONHCONH₂

NH₄COONH₂

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Rock phosphate constitutes mainly of

fluorapatite

di-calcium phosphate

mono-calcium phosphate

di-ammonium phosphate

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Dehydration of ammonium carbamate produces

urea

biuret

ammonia water

none of these

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Ammonia synthesis reaction is

exothermic

endothermic

autocatalytic

none of these

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Triple superphosphate is chemically represented as

CaF₂.3Ca₃(PO₄)₂

3Ca₃(PO₄)₂

Ca(PO₃)₂

Ca(H₂PO₄)₂

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In ammonia synthesis (N₂ + 3H₂ = 2NH₃), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

low pressure.

high pressure.

very high temperature.

atmospheric pressure; as the pressure has no effect on conversion.

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Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talchar (Orissa)

use coal for heating purpose.

gasify coal to get hydrogen from coal gas.

use coal as filler in fertiliser.

use coal as conditioner in fertiliser.

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

increased biuret formation

high corrosion rate

increased cost of equipment

all (a), (b) & (c)

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Which of the following gasifiers can be attached to coal based fertiliser plants ?

Lurgi (high pressure) gasifier.

Kopper-Totzek gasifier.

Gasifier working at 20 atm.

Gasifier working at 40 atm.