Describe the following points with respect to manufacturing of Urea. (i) Temperature (ii) Pressure (iii) Formation of Biuret

Describe the following points with respect to manufacturing of Urea. (i) Temperature (ii) Pressure (iii) Formation of Biuret
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Answer :

Manufacturing of Urea w.r.t following points

1. Temperature: Urea production rate increases as temperature increases up to 180oC and then fall sharply.

2. Pressure: Urea production rate increases as pressure increases. Pressure maintained is 180 atm.

3. Formation of biuret: Formation of biuret is not desirable in urea. It forms when two urea molecules combine with each other. It can be avoided by

keeping urea solution temperature just above melting point before sending to prilling tower.

2NH2 .CO.NH2 = NH2.CO.NH.CO.NH2 + NH

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