US 12,319,632 B2
Calcium sulfate urea granules and methods for producing and using the same
Harri Tapio Kiiski, Riyadh (SA); Andrew George Kells, Riyadh (SA); Mohamed Akasha M. Khaleel, Riyadh (SA); and Nilkamal Bag, Bangalore (IN)
Assigned to SABIC AGRI-NUTRIENTS COMPANY, Jubail (SA)
Filed by SABIC AGRI-NUTRIENTS COMPANY, Jubail (SA)
Filed on Sep. 22, 2023, as Appl. No. 18/472,794.
Application 18/472,794 is a continuation of application No. 17/673,973, filed on Feb. 17, 2022, granted, now 11,802,096.
Application 17/673,973 is a continuation of application No. 16/631,206, granted, now 11,299,441, previously published as PCT/IB2018/055397, filed on Jul. 19, 2018.
Claims priority of provisional application 62/626,932, filed on Feb. 6, 2018.
Claims priority of application No. 201711026033 (IN), filed on Jul. 21, 2017.
Prior Publication US 2024/0018066 A1, Jan. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C05G 5/12 (2020.01); C05C 9/00 (2006.01); C05D 3/00 (2006.01); C05G 5/30 (2020.01)
CPC C05G 5/12 (2020.02) [C05C 9/005 (2013.01); C05D 3/00 (2013.01); C05G 5/30 (2020.02); C05G 5/36 (2020.02)] 14 Claims
OG exemplary drawing
 
1. 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.
 
9. A method of fertilizing, the method comprising applying a plurality of calcium sulfate urea granules of claim 1 to a portion of the soil, a crop, or the soil and the crop.
 
11. 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.