High Biuret Content in Urea Dust
Post by amir_tafazol » Wed May 29, 2019 9:41 am
Dear all
we have analyzed several samples of urea dust (e.g. dust handling and conveying systems) for both prill and granular urea and the biuret content were high ( between 1-4 %) while the product had normal biuret!!! It shows that biuret does not exist uniformly in urea granules. Do you have such experience? Is there any scientific reason for it?
Best Regards,
we have analyzed several samples of urea dust (e.g. dust handling and conveying systems) for both prill and granular urea and the biuret content were high ( between 1-4 %) while the product had normal biuret!!! It shows that biuret does not exist uniformly in urea granules. Do you have such experience? Is there any scientific reason for it?
Best Regards,
High Biuret Content in Urea Dust
Dear Amir Hosein
You are saying right, the biuret found different percentage in different prills size.dust have maximum biuret and we have analysed and got same result.
There are two ways of Biuret formation at very high Temperature and before solidification
1. Formation of biuret takes place when urea is heated to its melting point it starts decomposition with evolution of ammonia, urea first isomerizes which dissociates into isocynic acid and ammonia. This process mainly found in dust
CO(NH2)2 = NH4CNO +NH3.
(UREA) (AMM.CYNATE)
The isocynic acid reacts with urea to form biuret.
NHCO + CO(NH2)2 = NH2CONHCONH2
This type of formation in dust and may be about 2-4%
And we have already analyzed the all type prills quality under size; oversize and dust all are having different biuret contents.
2. In the presence of excess ammonia biuret is formed at substantially lower rate by direct reaction between urea molecules. This biuret formation in whole process of urea
2CO (NH2)2 = NH2CONHCONH2 + NH3.
(UREA) BIURET AMMONIA
You are saying right, the biuret found different percentage in different prills size.dust have maximum biuret and we have analysed and got same result.
There are two ways of Biuret formation at very high Temperature and before solidification
1. Formation of biuret takes place when urea is heated to its melting point it starts decomposition with evolution of ammonia, urea first isomerizes which dissociates into isocynic acid and ammonia. This process mainly found in dust
CO(NH2)2 = NH4CNO +NH3.
(UREA) (AMM.CYNATE)
The isocynic acid reacts with urea to form biuret.
NHCO + CO(NH2)2 = NH2CONHCONH2
This type of formation in dust and may be about 2-4%
And we have already analyzed the all type prills quality under size; oversize and dust all are having different biuret contents.
2. In the presence of excess ammonia biuret is formed at substantially lower rate by direct reaction between urea molecules. This biuret formation in whole process of urea
2CO (NH2)2 = NH2CONHCONH2 + NH3.
(UREA) BIURET AMMONIA
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