How to reduce biuret formation in the production of urea using carbon dioxide stripping
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Recently, the level of urea biuret in our plant using the carbon dioxide stripping method has been high, around 1.0. I heard that adding methanol to urea can reduce biuret; is there such a method? Are there any other ways to reduce biuret? Please advise.
Minimize the residence time from the distillation tower outlet to the granulation nozzle, maximize the vacuum level in the evaporation separator, and minimize the temperature of the urine in the evaporation section.
Methanol is used to increase strength and reduce powderiness, I guess. Biuret is closely related to residence time and temperature
Methanol or formaldehyde? The addition of formaldehyde improves the strength of urea particles, while the use of methanol seems not to have been reported yet