Calcium sulfate urea granules and methods for producing and using the same
AssigneeSabic Agri-Nutrients Company
InventorsHarri Tapio 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.
Claims14
A calcium sulfate urea (UCS) fertilizer granule comprising urea, calcium sulfate, and a calcium sulfate urea adduct, wherein 50 wt. % to 80 wt. % of the urea in the granule is comprised in the calcium sulfate urea adduct, and wherein the granule comprises 32.5 to 44 wt. % elemental nitrogen, 4.5 to 15 wt. % elemental calcium, and 4 to 12 wt. % elemental sulfur.
A process to prepare a calcium sulfate urea fertilizer granule comprising a calcium sulfate urea adduct, the process comprising:
- (a) combining urea, hydrated and/or anhydrous calcium sulfate, and steam and/or water under conditions sufficient to form an aqueous solution comprising water, urea, and calcium sulfate, wherein the urea is solubilized in the aqueous solution;
- (b) mixing the aqueous solution under conditions sufficient to produce a wet fertilizer granule comprising a calcium sulfate urea adduct and water;
- and
- (c) removing at least a portion of the water from the wet fertilizer granule to form the calcium sulfate urea granule,
- wherein the conditions in (a) comprise a temperature of 85° C. to 120° C.
Dependencies are inferred from the claim text.