Amino alcohol solutions of N-(n-butyl)thiophosphoric triamide (NBPT) and urea fertilizers using such solutions as urease inhibitors
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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Abstract
A method of producing reduced volatility of urea fertilizers comprising: 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 combining a urea fertilizer in granular or liquid form with the NBPT solution.
40 Citations
16 Claims
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1. A method of producing reduced volatility of urea fertilizers comprising:
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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; andb) combining said NBPT solution with said urea fertilizer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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; andb) combining a granular urea fertilizer with said NBPT solution. - View Dependent Claims (9, 10, 11)
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12. A method of producing reduced volatility liquid urea fertilizer comprising:
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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; andb) mixing said NBPT solution with an aqueous solution of urea fertilizer. - View Dependent Claims (13, 14, 15, 16)
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Specification