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.
Type:
Grant
Filed:
June 30, 2011
Date of Patent:
April 24, 2012
Assignee:
Whitehurst Associates, Inc.
Inventors:
Garnett B. Whitehurst, Brooks M. Whitehurst
Abstract: Reduced volatility of urea fertilizers are prepared in accordance with the present invention by first preparing an N-(n-butyl)-thiophosphoric triamide (NBPT) solution by dissolving NBPT in a mixture of 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, and a carboxylic acid having 6 or fewer carbon atoms. The solution is then combining with a urea fertilizer in granular or liquid form.
Type:
Grant
Filed:
September 1, 2011
Date of Patent:
March 13, 2012
Assignee:
Whitehurst Associates, Inc.
Inventors:
Garnett B. Whitehurst, Brooks M. Whitehurst
Abstract: Reduced volatility of urea fertilizers are prepared in accordance with the present invention by first preparing an N-(n-butyl)-thiophosphoric triamide (NBPT) solution by dissolving NBPT in a mixture of 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, and a carboxylic acid having 6 or fewer carbon atoms. The solution is then combining with a urea fertilizer in granular or liquid form.
Type:
Grant
Filed:
February 17, 2009
Date of Patent:
November 1, 2011
Assignee:
Whitehurst Associates Inc.
Inventors:
Garnett B. Whitehurst, Brooks M. Whitehurst
Abstract: Volatility-inhibited fertilizers are prepared by coating granular urea with a coating that includes a binding agent having a boron anion and a hydrogen bonding group to adhere the binding agent to the granular urea. The binding agent may be an amino alcohol borate in which the amino alcohol is selected from the group consisting of ethanolamine, diethanolamine, triethanolamine, and mixtures thereof, or a borate of an amino alcohol complex of a divalent metal. The borates are preferably prepared as an aqueous solution of the amino alcohol and boric acid, or the amino alcohol, a divalent metal salt, and boric acid, with the aqueous solution being applied to the urea granules. Additional plant nutrients may also be coated onto the urea granules.
Type:
Grant
Filed:
August 7, 2002
Date of Patent:
December 14, 2004
Assignee:
Whitehurst Associates, Inc.
Inventors:
Garnett B. Whitehurst, Brooks M. Whitehurst
Abstract: A method of coating urea by first wetting urea pellets with water or an aqueous acid solution, and then blended the wetted urea pellets with a phosphate salt. During the coating process, when using an aqueous acid solution, the acid liberates a portion of the phosphate to a form available to the plant, and reduces the loss of urea nitrogen due to volatilization.
Type:
Grant
Filed:
May 28, 1998
Date of Patent:
February 29, 2000
Assignee:
Whitehurst Associates, Inc.
Inventors:
Brooks M. Whitehurst, Garnett B. Whitehurst
Abstract: This invention teaches the development of a chemical reagent useful as an aluminum brightening bath. The reagent's composition is primarily wet-process phosphoric acid to which has been added small quantities of nitric acid, copper, and optionally traces of several other substances. The reagent does not require expensive removal of the natural impurities found in wet-process phosphoric acid.
Type:
Grant
Filed:
September 28, 1982
Date of Patent:
July 23, 1985
Assignees:
Whitehurst Associates, Inc., Encee Chemical Sales, Inc.
Inventors:
Brooks M. Whitehurst, Donald F. Clemens, Taylor King, Garnett B. Whitehurst
Abstract: This invention teaches the development of a chemical reagent useful as an aluminum brightening bath. The reagent's composition is primarily wet-process phosphoric acid to which has been added small quantities of nitric acid, copper, and optionally traces of several other substances. The reagent does not require expensive removal of the natural impurities found in wet-process phosphoric acid.
Type:
Grant
Filed:
April 27, 1984
Date of Patent:
January 29, 1985
Assignees:
Whitehurst Associates, Inc., Encee Chemical Sales, Inc.
Inventors:
Brooks M. Whitehurst, Donald F. Clemens, Taylor King, Garnett B. Whitehurst
Abstract: This invention teaches the development of a chemical reagent useful as an aluminum brightening bath. The reagent's composition is primarily wet-process phosphoric acid to which has been added small quantities of nitric acid, copper, and optionally traces of several other substances. The reagent does not require expensive removal of the natural impurities found in wet-process phosphoric acid.
Type:
Grant
Filed:
April 27, 1984
Date of Patent:
January 29, 1985
Assignees:
Whitehurst Associates, Inc., Encee Chemical Sales, Inc.
Inventors:
Brooks M. Whitehurst, Donald F. Clemens, Taylor King, Garnett B. Whitehurst