Separation of biuret
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If there is a small amount of biuret in ammonium chloride products, are there any industrial devices for separating the biuret? If not, what methods can be used currently to separate biuret from ammonium chloride?
It’s not easy; it’s best not to mix in. Do you mean the solid form of this ammonium chloride product? It has already gotten in; we also need to know the proportion of it that has gotten in. If the content of biuret is very low, it is possible to use ethanol, isopropanol, or a mixture of ethanol and propanol as solvents to thoroughly wash the ammonium chloride product. Separation is achieved by taking advantage of the low solubility of ammonium chloride and the relatively higher solubility of biuret; however, such solvents are flammable, so safety must be observed. Think about it – it’s not easy to choose a suitable solvent. Others, including thermal decomposition, recrystallization after dissolution in water, electrodialysis, etc., are more complicated or not economically viable
It is ammonium chloride products (of course in solid form) that contain about 5% biuret, and I am considering industrial separation methods, not those used in the laboratory.
Perhaps we should start with the manufacturing process and raw materials to avoid the formation of biuret. The approaches to dealing with \"impurities\" in large-scale chemical manufacturing and fine chemical production are completely different. Using solvents for separation is the method employed in fine chemical production, but for products like ammonium chloride, it’s simply not cost-effective to use such a method.
Yes, the price of ammonium chloride is only 400 yuan per ton right now. It is better to avoid it at the source; otherwise, solvent extraction is one of the few economically viable process options.