Patent ID: 11912634
Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 13:
14. A method of making the calcium sulfate urea (UCS) fertilizer granule of claim 1, the method comprising:
combining urea, calcium sulfate, and water to form an aqueous slurry, wherein urea is combined in excess of the stoichiometric ratio for production of a calcium sulfate urea adduct and the urea and calcium sulfate are combined in sufficient ratios to produce the aqueous slurry capable of producing a dried product containing 33 wt. % to 40 wt. % elemental nitrogen, 2 wt. % to 5 wt. % elemental calcium, 2 wt. % to 5 wt. % elemental sulfur;
mixing the aqueous slurry under conditions sufficient to produce a calcium sulfate urea adduct wherein at least 30 wt. % of the urea in the granule is comprised in the calcium sulfate urea adduct; and
removing at least a portion of the water from the aqueous slurry to form the calcium sulfate urea (UCS) fertilizer granule with less than 1 wt. % free moisture.