Urea sulfate synthesis (acid concentration?)

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The discussion revolves around the production of urea sulfate crystals from fertilizer-grade urea granules and sulfuric acid. The process involves dissolving urea in sulfuric acid and precipitating the crystals, but there is uncertainty regarding the appropriate concentration of the acid to use, as concentrated sulfuric acid poses safety risks. Previous successful experiments with urea and phosphoric acid have been noted, but specific guidance on the acid concentration for this process is lacking. Additionally, there is a query about the solubility of urea sulfate in water, which is crucial for the experiment, as it is believed to be water-soluble due to its use in liquid fertilizers. The final product is expected to contain 25% nitrogen and 43% sulfur, but without solubility data, further progress on the experiment is hindered.
rommie
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Hi all!

I am currently doing trials on different fertilizer production methods. I want to make urea sulfate crystals from fertilizer grade urea granules (46% N) and sulfuric acid. I suspect it would be a straightforward process, dissolve the urea in acid and precipitate the crystals and separate it from the mother liquor. I however have no idea what the concentration of the acid should be, I suspect it should be diluted but don't know to what percentage. I do not want to use concentrated sulfuric acid due to obvious safety reasons. Internet search has not yielded a recipe to make this either.
I did a similar experiment successfully with urea and 52% phosphoric acid, and got a good yield of urea phosphate crystals.
Any help is appreciated!

Thanks
Rommie
 
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What is the solubility of urea sulfate in water?
 
I can't seem to find a value, not even on msds sheets. But it's used as a liquid fertilizer in drip irrigation so I suppose its completely water soluble.
 
You can't go any further without that information unless you are willing to just guess or you intend to use too much water (too dilute acid) and concentrate it until the product precipitates.
 
The only other info I have is that the final product contains 25% N and 43% S.
I am still searching for solubility values...:frown:
 
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