IP Library › Granted Patent US 12,384,732
Granted Patent B2
US 12,384,732 · App. 17/299,406 · Granted Aug 12, 2025

Fertilizers containing calcium sulfate urea and methods for producing and using the same

Inventors: Mohamed Akasha M. Khaleel (Riyadh, SA); Andrew George Kells (Wilton, GB); Saleh Nafe Al Shammari (Riyadh, SA)
Assignee: SABIC AGRI-NUTRIENTS COMPANY
C05G1/00C05C1/00C05C3/00C05C9/00C05D3/00C05D9/02
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Quick Facts
Patent No.
US 12,384,732
App. No.
17/299,406
Granted
Aug 12, 2025
Kind
B2
Abstract

A fertilizer composition containing a calcium sulfate urea (UCS) fertilizer and a urea free nitrogenous fertilizer and methods for making and using the same are disclosed. The calcium sulfate urea can be a calcium sulfate urea adduct. The urea free nitrogenous fertilizer can include one or more of ammonium sulfate urea and ammonium nitrate.

Claims (22)

1. A fertilizer composition comprising a calcium sulfate urea adduct and a urea free nitrogenous fertilizer, wherein the composition comprises 23 wt. % to 26 wt. % elemental nitrogen, 9 wt. % to 11 wt. % elemental calcium, and 6 wt. % to 11 wt. % elemental sulfur, and wherein at least 50 wt. % of urea in the composition is comprised in the calcium sulfate urea adduct.

2. The fertilizer composition of claim 1 , wherein the urea free nitrogenous fertilizer comprises ammonium sulfate.

3. The fertilizer composition of claim 1 , wherein the urea free nitrogenous fertilizer comprises ammonium nitrate.

4. The fertilizer composition of claim 1 , comprising 2 wt. % to 7 wt. % elemental nitrogen in nitrate form (NO 3 ).

5. The fertilizer composition of claim 1 , comprising 1 wt. % to 5 wt. % elemental nitrogen in ammoniacal form (NH 3 ).

6. The fertilizer composition of claim 1 , further comprising one or more of iron, manganese, zinc, and copper.

7. The fertilizer composition of claim 1 , comprising particles of the calcium sulfate urea adduct and particles of the urea free nitrogenous fertilizer.

8. The fertilizer composition of claim 1 , comprising 15 wt. % to 25 wt. % elemental nitrogen in uric form (NH 2 ).

9. The fertilizer composition of claim 1 , comprising 1 wt. % to 5 wt. % elemental nitrogen in ammoniacal form (NH 3 ) and 2 wt. % to 7 wt. % elemental nitrogen in nitrate form (NO 3 ).

10. The fertilizer composition of claim 1 , wherein the composition is a fertilizer blend or a compounded fertilizer.

11. The fertilizer composition of claim 1 , further comprising a phosphate-based fertilizer, a urea-based fertilizer, or a potassium-based fertilizer.

12. The fertilizer composition of claim 1 , further comprising a micronutrient, a secondary nutrient, an organic additive, or any combination thereof.

13. A method of making the fertilizer composition of claim 1 , the method comprising:

(a) forming and/or obtaining a calcium sulfate urea adduct and combining the formed and/or obtained adduct with a urea free nitrogenous fertilizer to obtain the fertilizer composition; or

(b) forming a calcium sulfate urea adduct from a mixture comprising urea, CaSO 4 , water, and a urea free nitrogenous fertilizer to obtain the fertilizer composition.

14. The method of claim 13 , wherein forming the calcium sulfate urea adduct comprises reacting urea and CaSO 4 to form the adduct.

15. The method of claim 14 , wherein the reaction is performed at a temperature of 60° C. to 115° C.

16. The method of claim 14 , comprising reacting urea and CaSO 4 at a weight ratio of 2:1 to 1:2, and wherein the urea free nitrogenous fertilizer is present in the fertilizer composition at a weight ratio of 1:6 to 1:2 as compared to the total amount of urea in the fertilizer bound in the calcium sulfate urea adduct and unbound.

17. The method of claim 13 , wherein the urea free nitrogenous fertilizer comprises ammonium sulfate.

18. The method of claim 13 , wherein the urea free nitrogenous fertilizer comprises ammonium nitrate.

19. The method of claim 13 , wherein the fertilizer composition is dried to form a solid fertilizer composition.

20. A method of fertilizing, the method comprising applying the fertilizer composition of claim 1 to a portion of a soil, a crop, or the soil and the crop.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 16, 2024
From: SAUDI BASIC INDUSTRIES CORPORATION
To: SABIC AGRI-NUTRIENTS COMPANY
Reel/Frame 067128/0216 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 2, 2024
From: SABIC GLOBAL TECHNOLOGIES B.V.
To: SAUDI BASIC INDUSTRIES CORPORATION
Reel/Frame 066986/0030 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 3, 2021
From: KHALEEL, MOHAMED AKASHA M.; KELLS, ANDREW GEORGE; AL SHAMMARI, SALEH NAFE
To: SABIC GLOBAL TECHNOLOGIES B.V.
Reel/Frame 056429/0204 →
Continuity (2)
Provisional Application 62776557 · Dec 7, 2018
Related Publication 20220119320A1 · Apr 21, 2022
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