Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in__________________?
Correct answer: B. Biuret formation
- A. Low bulk density product
- B. Biuret formation
- C. Non-spherical prills
- D. Substantially wet non-flowing and sticky product
Explanation
Excess residence time just above the melting point promotes condensation of urea to biuret. This impurity is avoided by spraying and solidifying the melt rapidly.
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