Back to results
US 9,790,136 B2Granted
Urea and nitrogen stabilizer compositions and methods and systems of making and using thereof
AssigneeKoch Agronomic Services, LLC
InventorsKurt D. Gabrielson, Allen Sutton
Life of this patent
Estimating the term…
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 in odor control.
Claims28
A stabilized urea composition comprising:
- a. urea;
- and
- b. a nitrogen stabilizer composition, wherein said nitrogen stabilizer composition comprises NBPT at a purity of at least 90%, and further wherein the concentration of NBPT is less than 0.2 weight percent based on the total weight of the stabilized urea composition.
A composition comprising:
- a. a nitrogen stabilizer composition comprising NBPT at a purity of at least 90%, and
- b. a liquid carrier selected from the group consisting of alkanol, alkenol, hydroxyalkyl aryl, glycol, glycol ether, glycol ester, glycerol, poly(alkylene glycol), poly(alkylene glycol) ether, poly(alkylene glycol) ester, alkanolamine, hydroxy acid, DMSO, N-methyl 2-pyrrolidinone (NMP), and mixtures thereof, wherein the concentration of NBPT in the liquid carrier is between 1 wt. % and 55 wt. %.
A method of making a stabilized urea composition comprising:
- a. providing a liquid nitrogen stabilizer composition comprising a liquid carrier and a nitrogen stabilizer composition, wherein said nitrogen stabilizer composition comprises NBPT at a purity of at least 90%, and further wherein the concentration of NBPT in the liquid carrier is between 1 wt. % and 55 wt. %, and
- b. contacting said liquid nitrogen stabilizer composition with solid urea.
Dependencies are inferred from the claim text.