Purification of biuret
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In the production process of biuret, the purification method seems to involve alcohol washing. Anyone who has knowledge about the purification of biuret please share information or provide references (including links). For example, if the crude product contains 30–40% biuret, how can this percentage be increased to around 99%.
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Dicyandiamide is readily soluble in methanol and ethanol. Your biuret contains only 30-40% biuret; what is the rest? Urea, ammonium chloride? This is more important, right?
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Since this 30% figure is also an estimate, it won’t be very accurate. For now, consider biuret + ammonium chloride.
The production of biuret must be an industry, right? I hope industry professionals can provide feasible standard procedures. As a layperson, I can only offer random suggestions: Try using ethanol as a solvent to dissolve the biuret first, and see what the purity of the biuret is after recrystallization And what is the yield of biuret? If all the criteria are met, it’s done. If the purity is not sufficient, it is recommended to use isopropanol, propanone, chloroform, or dichloroethane instead of ethanol to see how it works If the yield is insufficient, try using methanol or mixtures of methanol and ethanol in different proportions as solvents. As a layperson, I can only offer suggestions. After thinking for a long time, I couldn’t find a solvent that could dissolve ammonium chloride but not biuret. If adding a small amount of water to completely dissolve the mixture, followed by crystallization through freezing (cooling) or concentration-crystallization via evaporation, could be one approach, but without any data at hand, I dare not give advice rashly.