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Amino alcohol solutions of N-(n-butyl)thiophosphoric triamide (NBPT) and urea fertilizers using such solutions as urease inhibitors

  • US 8,163,058 B2
  • Filed: 06/30/2011
  • Issued: 04/24/2012
  • Est. Priority Date: 02/17/2009
  • Status: Active Grant
First Claim
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1. A method of producing reduced volatility of urea fertilizers comprising:

  • a) dissolving N-(n-butyl)-thiophosphoric triamide (NBPT) in an amino alcohol having the formula 1—

    (H)x

    N—

    ((CH2)m

    OH)n where m is 1-3, x is 0 or 1, and n is 2 when x is 1 and 3 when x is 0;

    or the formula 2—

    (H)y

    N—

    ((CH2)—

    CHOH—

    CH3)z such that the length of the carbon chain where the secondary hydroxyl group is located is 3, y is 0 or 1, and z is 2 when y is 1 and 3 when y is 0 to form an NBPT solution; and

    b) combining said NBPT solution with said urea fertilizer.

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