Urea-based blend composition and method for the manufacture thereof

Patent metadata

Field	Value
Publication number	US-11578009-B2
Application number	US-201917053330-A
Country	US
Kind code	B2
Filing date	May 9, 2019
Priority date	May 9, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

The invention relates to a particulate urea-based blend composition comprising a urea-based compound in particulate form and one or more components in particulate form, selected from the group of nitrates, phosphates, sulphates and chlorides, and a urease inhibitor of the type phosphoric triamide, and a magnesium sulphate, wherein the urea-based blend composition is further characterized in that it comprises an alkaline or alkaline-forming compound, selected from the group of calcium oxide, zinc oxide, magnesium oxide, calcium carbonate, and mixtures thereof. The composition according to the invention has improved properties for reducing ammonia loss by urease activity in the soil and is in particular suitable as a fertilizer. The invention further relates to a method for the manufacture of said urea-based blend composition, as well as to a composition of kit of parts comprising an amount of a) magnesium sulphate; b) a urease inhibitor of the type phosphoric triamide, preferably N-(n-butyl) thiophosphoric triamide (nBTPT); c) an alkaline or alkaline-forming compound, selected from the group of calcium oxide, zinc oxide, magnesium oxide, calcium carbonate, and mixtures thereof, and d) optionally, one or more anti-caking and/or moisture-repellent and/or anti-dust compounds.

First claim

The invention claimed is:

1. A particulate urea-based blend composition comprising:
40 to 99 weight % of an urea-based compound in particulate form;
1 to 60 weight % of at least one component in particulate form selected from the group consisting of nitrates, phosphates, sulphates and chlorides;
0.0001 to 1 weight % of a phosphoric triamide urease inhibitor;
0.02 to 1 weight % of magnesium sulphate; and
an amount of an alkaline or alkaline-forming compound selected from the group consisting of calcium oxide, zinc oxide, magnesium oxide, calcium carbonate, and mixtures thereof, such that the weight ratio of the alkaline or alkaline-forming compound to magnesium sulphate ranges from 1:20 to 1:2;
adding up to 100 weight %, being the total weight of the composition.

2. The urea-based blend composition according to claim 1 , wherein the urease inhibitor is present at a level of 0.02 to 0.2 weight % relative to the total weight of the urea-based blend composition.

3. The urea-based blend composition according to claim 2 , wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide (nBTPT).

4. The urea-based blend composition according to claim 2 , wherein the level of urease inhibitor is from 0.03 to 0.06 weight %.

5. The urea-based blend composition according to claim 1 , wherein the weight ratio of alkaline or alkaline-forming compound to magnesium sulphate ranges from 1:15 to 1:2.

6. The urea-based blend composition according to claim 5 , wherein the weight ratio of alkaline or alkaline-forming compound to magnesium sulphate ranges from 1:10 to 1:2.

7. The urea-based blend composition according to claim 1 , comprising urea in particulate form either coated or melt-mixed with a phosphoric triamide urease inhibitor, ammonium phosphate (MAP or DAP) in particulate form, potassium chloride (MOP), and a magnesium sulphate.

8. The urea-based blend composition according to claim 7 , wherein the urease inhibitor is N-(n-butyl)-thiophosphoric triamide.

9. The urea-based blend composition according to claim 1 , comprising urea in particulate form either coated or melt-mixed with a phosphoric triamide urease inhibitor, ammonium sulphate (AS) in particulate form, and a magnesium sulphate.

10. The urea-based blend composition according to claim 9 , wherein the urease inhibitor is N-(n-butyl)-thiophosphoric triamide.

11. The urea-based blend composition according to claim 1 , wherein the magnesium sulphate is present in the composition at a level of 0.05 to 1 weight %, relative to the total weight of the composition.

12. The urea-based blend composition according to claim 1 , wherein the magnesium sulphate is selected from the group consisting of anhydrous, mono-, di-, tri-, tetra-, penta-, hexa-, heptahydrate, and mixtures thereof.

13. The urea-based blend composition according to claim 1 , wherein the phosphoric triamide urease inhibitor is a compound of formula I:

wherein:
X is oxygen or sulphur;
R 1 is alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, or cycloalkyl;
R 2 is hydrogen, alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, or cycloalkyl, or R 1 and R 2 together may form an alkylene or alkenylene chain which may optionally include one or more heteroatoms of divalent oxygen, nitrogen or sulphur completing a 4, 5, 6, 7, or 8 membered ring system;
R 3 , R 4 , R 5 and R 6 are individually hydrogen or alkyl having 1 to 6 carbon atoms, and

alkyl, cycloalkenyl, aralkyl, aryl, alkenyl, alkynyl, and cycloalkyl refer to compounds having from 1 to 10 carbon atoms.

14. The urea-based blend composition according to claim 1 , wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide (nBTPT).

15. The urea-based blend composition according to claim 1 , wherein the alkaline or alkaline-forming compound is magnesium oxide.

16. The urea-based blend composition according to claim 1 , wherein the urea-based compound is selected from urea, urea calcium sulphate (UCaS), urea calcium nitrate (UCaN), urea magnesium nitrate (UMgN), urea calcium phosphate (UCaP), urea magnesium phosphate (UMgP), urea superphosphate (USP), urea calcium ammonium nitrate (UCAN), urea ammonium sulphate (UAS), urea ammonium phosphate (UAP), urea potassium salts (UK), or mixtures thereof.

17. The urea-based blend composition according to claim 1 , wherein the at least one component in particulate form is selected from the group consisting of ammonium nitrate, calcium nitrate, calcium ammonium nitrate, sodium nitrate, ammonium sulphate nitrate, potassium ammonium nitrate, ammonium phosphate, calcium bis(dihydrogen orthophosphate), super phosphate, triple superphosphate (TSP), rock phosphate, potassium sulphate, potassium magnesium sulphate, ammonium sulphate (AS), potassium chloride (MOP), and mixtures thereof.

18. The urea-based blend composition according to claim 1 wherein the composition contains:
40 to 99 weight % of a urea-based compound in particulate form;
1 to 60 weight % of one or more components in particulate form, selected from the group consisting of nitrates, phosphates, sulphates and chlorides;
0.03 to 0.06 weight % of nBTPT;
0.05 to 0.1 weight % of a magnesium sulphate; and
0.015 to 0.03 weight % of magnesium oxide,
adding up to 100 weight %, being the total weight of the composition.

19. A method comprising treating a soil with the particulate urea-based blend composition as claimed in claim 1 as a fertilizer.

20. A method for the manufacture of a particulate urea-based blend composition according to claim 1 , the method comprising the steps of:
1) providing 40 to 99 weight % of the urea-based compound in particulate form;
2) providing 1 to 60 weight % of the at least one component in particulate form selected from the group consisting of nitrates, phosphates, sulphates and chlorides;
3) providing 0.02 to 1 weight %, relative to the total weight of the composition, of a magnesium sulphate;
4) providing 0.0001 to 1 weight %, relative to the total weight of the composition, of a phosphoric triamide urease inhibitor;
5) providing an amount of the alkaline or alkaline-forming compound, selected from the group consisting of calcium oxide, zinc oxide, magnesium oxide, calcium carbonate, and mixtures thereof, such that the weight ratio of said alkaline or alkaline-forming compound to magnesium sulphate ranges from 1:20 to 1:2;
6) optionally, providing coating material wherein the coating material is able to increase at least the anticaking and/or moisture repellence and/or anti-dust properties of said urea-based blend composition; and
7) mixing the components provided in steps 1), 2), 3), 4), 5) and 6) in any order.

21. The method according to claim 20 , wherein the urease inhibitor is N-(n-butyl) thiophosphoric triamide.

22. A kit of parts, comprising an amount of:
a) a phosphoric triamide urease inhibitor;
b) a magnesium sulphate, such that the weight ratio of the phosphoric triamide urease inhibitor to magnesium sulphate ranges from 1:20 to 1:1;
c) an alkaline or alkaline-forming compound, selected from the group consisting of calcium oxide, zinc oxide, magnesium oxide, calcium carbonate, and mixtures thereof, such that the weight ratio of said alkaline or alkaline-forming compound to magnesium sulphate ranges from 1:20 to 1:2; and
d) optionally, at least one anti-caking and/or moisture-repellent and/or anti-dust compounds.

Assignees

• Yara Int Asa

Inventors

• Van Belzen Ruud
• Colpaert Filip

Classifications

• Y02P60/21

  Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures · CPC title

• C05G3/30

  Anti-agglomerating additives; Anti-solidifying additives · CPC title

• C05D5/00

  Fertilisers containing magnesium (C05D7/00 takes precedence) · CPC title

• A23K20/24

  Compounds of alkaline earth metals, e.g. magnesium · CPC title

• A23K40/30

  by encapsulating; by coating · CPC title