Urea and nitrogen stabilizer compositions and methods and systems of making and using thereof

• US 9,394,210 B2
• Filed: 08/25/2014
• Issued: 07/19/2016
• Est. Priority Date: 08/23/2013
• Status: Active Grant

• Current Assignee: KOCH Agronomic Services LLC (KOCH Industries Incorporated)
• Original Assignee: KOCH Agronomic Services LLC (KOCH Industries Incorporated)
• Inventors: Gabrielson, Kurt D., Sutton, Allen
• Primary Examiner(s): LANGEL, WAYNE A
• Application Number:
  US14/468,174
• Publication Number:
  US 20150101379A1
• Time in Patent Office: 694 Days
• Field of Search: 71 28- 30
• US Class Current: 1/1
• CPC Class Codes: B01F 27/113 Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
• CPC Class Codes: C05B 7/00 Fertilisers based essentially on alkali or ammonium orthophosphates C05B11/00 takes precedence
• CPC Class Codes: C05C 1/02 Granulation apparatus B01J2/00; Pelletisation; Stabilisation; Colouring
• CPC Class Codes: C05C 9/00 Fertilisers containing urea or urea compounds
• CPC Class Codes: C05G 3/90 for affecting the nitrification of ammonium compounds or urea in the soil
• CPC Class Codes: C09K 15/22 containing an amide or imide moiety
• CPC Class Codes: C09K 15/26 containing nitrogen and sulfur
• CPC Class Codes: Y02P 60/21 Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

Abstract

This invention relates to an improved urea-nitrogen stabilizer composition and methods, systems and apparatti for making thereof. The nitrogen stabilizer composition is incorporated into molten urea to result in a composition that contains less biuret, NMP, nitrogen stabilizer and/or impurities and provides an effective solid fertilizer. These compositions are useful in odor control.

Claims

1. A method of producing a solid urea-nitrogen stabilizer composition comprising:

a) forming molten urea;

b) adding a nitrogen stabilizer composition to said molten urea, wherein said nitrogen stabilizer composition comprises NBPT at a purity of at least 95% by weight; and

c) cooling the molten urea-nitrogen stabilizer composition to form the solid urea-nitrogen stabilizer composition.

2. The method of claim 1, wherein said solid urea-nitrogen stabilizer composition has at least 90% of said NBPT remaining after storing the stabilizer composition at 22°

C. for 32 days in a glass, well-sealed container.

3. The method of claim 1, further comprising adding a nitrification inhibitor prior to said cooling.

4. The method of claim 3, wherein the nitrification inhibitor is dicyandiamide (DCD).

5. The method of claim 3, wherein the nitrification inhibitor is selected from the group consisting of thiourea, 1-mercapto-1,2,4-triazole, 2-amino-4-chloro-6-methyl-pyramidine, 2,4-diamino-6-trichloro-methyltriazine, 2-chloro-6-(trichloromethyl-pyridine), 3,4-dimethylpyrazole phosphate (DMPP), 1H-1,2,4-triazole, 3-methylpyrazole, azadirachta indica Juss (Neem) and nitrapyrin.

6. The method of claim 3, wherein said adding a nitrification inhibitor occurs prior to said adding a nitrogen stabilizer composition.

7. The method of claim 3, wherein said nitrification inhibitor and said nitrogen stabilizer composition are added simultaneously prior to said cooling.

8. The method of claim 1, wherein the solid form of the urea-nitrogen stabilizer composition is a granule, a prill, a pellet, a pastille, or a compounded form.

9. The method of claim 1, further comprising adding a dye prior to said cooling.