Highly concentrated phosphoric or thiophosphoric triamide formulation

Patent metadata

Field	Value
Publication number	US-9834487-B2
Application number	US-201615206657-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 13, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present disclosure relates to a novel highly concentrated phosphoric or thiophosphoric triamide formulation with enhanced stability against crystallization or freezing under extended exposure to low temperature of 0° C. or below. It also provides a method to make and use such formulations.

First claim

We claim:

1. A highly concentrated phosphoric or thiophosphoric triamide composition comprising:
i). a phosphoric or thiophosphoric triamide with a concentration range from 35% to 50% by weight, wherein said phosphoric or thiophosphoric triamide is a compound according to Formula I:
(X═P)(NH 2 ) 2 NR 1 R 2   (Formula I)

wherein X is oxygen or sulfur, and R 1 and R 2 are independently hydrogen, C 1 -C 12 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 5 -C 14 heteroaryl, C 1 -C 14 heteroalkyl, C 2 -C 14 heteroalkenyl, C 2 -C 14 heteroalkynyl, or C 3 -C 12 cycloheteroalkyl;
ii). a glycol or glycol derivative with a concentration range from about 5% to about 30% by weight, wherein said glycol is a compound according to C n H 2n (OH) 2 (Formula II), and wherein n is 2-12; and
iii). a liquid amide with a concentration range from about 20% to about 50% by weight, wherein said liquid amide is selected from the group consisting of 2-pyrrolidone, N—(C 1 -C 12 alkyl)-2-pyrrolidone, and an amide with the formula R 1 CONR 2 R 3 , wherein R 1 is a hydrogen or C 1 -C 4 alkyl, and R 2 and R 3 are independently hydrogen or C 1 -C 12 alkyl,
wherein the ratio of the weight percentage of iii) to ii) is more than 1.0, and
wherein said highly concentrated phosphoric or thiophosphoric triamide composition is physically stable at a temperature of 0° C., and there is substantially no freezing of the composition or crystallization of any solid for at least 14 days at 0° C.

2. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , further comprising a dye with a concentration range from about 1.0% to about 2.0% by weight.

3. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , wherein said phosphoric or thiophosphoric triamide is N-(n-butyl) thiophosphoric triamide (NBPT).

4. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , wherein said glycol or glycol derivative is a compound according to Formula II, and wherein n is 2-6.

5. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , wherein said glycol or glycol derivative is propylene glycol (PG).

6. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , wherein said liquid amide is N—(C 1 -C 12 alkyl)-2-pyrrolidone.

7. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , wherein said liquid amide is N-methyl-2-pyrrolidone (NMP).

8. The highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 , comprising:
i). N-(n-butyl) thiophosphoric triamide (NBPT) with a concentration in the range from about 42% to about 48% by weight;
ii). propylene glycol (PG) with a concentration in the range from about 8% to about 15% by weight;
iii). N-methyl-2-pyrrolidone (NMP) with a concentration in the range from about 35% to about 45% by weight; and
iv). a dye with a concentration in the range from about 1.2% to about 1.8% by weight.

9. A method comprising contacting a composition according to claim 1 with a urea-based fertilizer.

10. The method according to claim 9 , wherein said urea-based fertilizer is urea granules or prills.

11. The method according to claim 9 , wherein said urea-based fertilizer is molten urea.

12. A urea-based fertilizer comprising urea and a highly concentrated phosphoric or thiophosphoric triamide composition according to claim 1 .

13. A method of making the highly concentrated NBPT composition according to claim 1 by combining NBPT, PG, NMP and a dye to make a homogeneous solution.

Assignees

• Koch Agronomic Services Llc

Inventors

• Bobeck Drew R
• Owusu-Adom Kwame

Classifications

• C07F9/224 Primary

  Phosphorus triamides · CPC title

• C05G3/90 Primary

  for affecting the nitrification of ammonium compounds or urea in the soil · CPC title

• C05C9/00

  Fertilisers containing urea or urea compounds · CPC title

• C05G3/08 Primary

  Chemistry & Metallurgy · mapped topic