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US 11,299,441 B2Granted
Calcium sulfate urea granules and methods for producing and using the same
AssigneeSabic Global Technologies B.V.
InventorsHarri Kiiski, Andrew George Kells, Mohamed Akasha M. Khaleel, Nilkamal Bag
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Abstract
A calcium sulfate urea (UCS) fertilizer granule and methods for making and using the same are disclosed. The granule can include urea, calcium sulfate, and a calcium sulfate urea adduct, wherein a portion of the surface of the calcium sulfate urea adduct includes a layer comprising urea, calcium sulfate, or calcium sulfate urea adduct, or any combination or all thereof.
Claims12
A process to prepare a calcium sulfate urea fertilizer granule the process comprising:
- combining urea, hydrated or anhydrous calcium sulfate, and steam under conditions sufficient to form an aqueous solution comprising water, urea, and calcium sulfate, wherein the urea is solubilized in the aqueous solution;
- mixing the aqueous solution under conditions sufficient to produce a wet fertilizer granule comprising a calcium sulfate urea adduct and water;
- and
- removing at least a portion of the water from the wet fertilizer granule to form the calcium sulfate urea granule,
- wherein the calcium sulfate urea fertilizer granule formed comprises urea, calcium sulfate, and the calcium sulfate urea adduct, and
- wherein a portion of the surface of the calcium sulfate urea adduct includes a layer comprising urea, calcium sulfate, or the calcium sulfate urea adduct, or any combination or all thereof.
3 more elements
Dependencies are inferred from the claim text.