# US 12,006,273 B2 · Enhanced efficiency fertilizer with urease inhibitor and nitrification inhibitor in separate particles

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- Number: US 12,006,273 B2
- Document ID: US12006273B2
- Status: Granted
- Kind: B2
- Application number: 17/715,466
- Filed: 2022-04-07
- Published: 2022-08-11
- Granted: 2024-06-11
- Earliest claimed: 2017-04-19
- Assignees: Sabic Agri-Nutrients Company
- Applicants: SABIC Global Technologies B.V.
- Inventors: Ravi Hegde; Rajamalleswaramma Koripelly; Chandra Mohana; Radha Achanath; Samik Gupta; Sabeshan Kanagalingam
- Web page: https://patentgrep.com/patent/US12006273B2

## CPC

- C05G 3/90: for affecting the nitrification of ammonium compounds or urea in the soil
- C05C 9/00: Fertilisers containing urea or urea compounds
- C05C 9/005: {Post-treatment}
- C05C 11/00: Other nitrogenous fertilisers
- C05G 5/30: Layered or coated, e.g. dust-preventing coatings
- C05G 5/35: Capsules, e.g. core-shell
- C05G 5/40: Fertilisers incorporated into a matrix
- Y02P 60/21: Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
- C05G: MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS (organic fertilisers containing added bacterial cultures, mycelia, or the like C05F11/08; organic fertilisers containing plant vitamins or hormones C05F11/10); FERTILISERS CHARACTERISED BY THEIR FORM
- C05C: NITROGENOUS FERTILISERS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Particulate fertilizer compositions that include nitrification inhibitors and urease inhibitors are described herein. The inhibitors are separated from each other by being in separate particles. Fertilizer particles in the composition include particles having a core-shell structure, with an inhibitor included in the core particle.

## Claims

### Claim 1

A particulate fertilizer composition comprising:
(a) a first particle comprising a urease inhibitor and is substantially free of any nitrification inhibitor; and
(b) a second particle comprising a nitrification inhibitor and is substantially free of any urease inhibitor,
wherein the first particle and the second particle are separate from each other.

### Claim 2 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle and/or the second particle further comprise a nitrogen fertilizer.

### Claim 3 (depends on 2)

The particulate fertilizer composition of claim 2, wherein the nitrogen fertilizer is comprised in an outer layer of the first particle and/or the second particle and the urease inhibitor and/or nitrification inhibitor is comprised in a core partially surrounded by the outer layer.

### Claim 4 (depends on 3)

The particulate fertilizer composition of claim 3, wherein the weight ratio of the outer layer to the core of the first particle and/or second particle is between about 40:1 and 5:1.

### Claim 5 (depends on 3)

The particulate fertilizer composition of claim 3, wherein the outer layer of the first particle further comprises a urease inhibitor and/or the outer layer of the second particle further comprises a nitrification inhibitor.

### Claim 6 (depends on 2)

The particulate fertilizer composition of claim 2, wherein the urease inhibitor and/or nitrification inhibitor is comprised in an outer layer of the first particle and/or the second particle and the nitrogen fertilizer is comprised in a core partially surrounded by the outer layer.

### Claim 7 (depends on 2)

The particulate fertilizer composition of claim 2, wherein the nitrogen fertilizer comprises urea.

### Claim 8 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the urease inhibitor comprises N-(n-butyl) thiophosphoric triamide and the nitrification inhibitor comprises dicyandiamide.

### Claim 9 (depends on 8)

The particulate fertilizer composition of claim 8, wherein the N-(n-butyl) thiophosphoric triamide is between 1 and 5 wt % of the first particle and the dicyandiamide is between 10 and 50 wt % of the second particle.

### Claim 10 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle and/or the second particle further comprises a binder.

### Claim 11 (depends on 10)

The particulate fertilizer composition of claim 10, wherein the binder comprises one or more of plaster of paris, flour, biodegradable bleached wheat flour, starch, colloidal silica, kaolin, bentonite, or gluten.

### Claim 12 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle and/or the second particle further comprises a filler.

### Claim 13 (depends on 12)

The particulate fertilizer composition of claim 12, wherein the filler comprises one or more of silica, dried distillers grains with solubles, or rice husk.

### Claim 14 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle and/or the second particle further comprises a pH buffering agent.

### Claim 15 (depends on 14)

The particulate fertilizer composition of claim 14, wherein the pH buffering agent comprises one or more of chalk powder, CaCO3, MgO, KH2PO4, NaHCO3, Na2CO3, or K2CO3.

### Claim 16 (depends on 1)

The particulate fertilizer composition of claim 1, further comprising a third particle comprising a nitrogen fertilizer, wherein the first particle, second particle, and third particle are separate from each other.

### Claim 17 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the particulate fertilizer composition comprises a plurality of first particles and a plurality of second particles, and wherein the weight ratio of the first particles to the second particles is approximately 1:1.

### Claim 18 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle comprises 10 to 94 wt. % binder, 0 to 60 wt % filler, 5 to 60 wt. % pH balancing agent, and 1 to 5 wt. % urease inhibitor, and wherein the second particle comprises 10 to 85 wt. % binder, 0 to 50 wt. % filler, 5 to 60 wt. % pH balancing agent, and 10 to 50 wt. % nitrification inhibitor.

### Claim 19 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the first particle and/or second particle are between about 0.5 and 8 mm in diameter.

### Claim 20 (depends on 1)

The particulate fertilizer composition of claim 1, wherein the particulate fertilizer composition comprises sufficient urease inhibitor and nitrification inhibitor so that less than 20 wt. % of nitrogen in the particulate fertilizer composition is lost via ammonia volatilization after being exposed to Greenville soil or Crowley soil for 20 days.