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Publication numberUST969003 I4
Publication typeGrant
Application numberUS 05/807,842
Publication dateApr 4, 1978
Filing dateJun 20, 1977
Priority dateJun 20, 1977
Publication number05807842, 807842, US T969003 I4, US T969003I4, US-I4-T969003, UST969003 I4, UST969003I4
InventorsJohn F. Phillips, Jr., John J. Kohler
Original AssigneeTennessee Valley Authority
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Controlled release liquid fertilizers
US T969003 I4
Abstract
liquid fertilizers having controlled release properties are prepared from fertilizer solutions and oil-surfactant mixtures. An invert surfactant is dissolved in an oil such as kerosene. The amount of surfactant used can vary over a wide range. Use of between 0.6 and 1.0 percent surfactant in the fertilizer formulation yields fertilizers with acceptable release rates. Liquid fertilizer is slowly added to the oil-surfactant mixture with vigorous agitation causing a water-in-oil emulsion to form. Mixtures containing 80 to 90 percent liquid fertilizer and 10 to 20 percent oil made excellent products.
The final fertilizer product is an invert emulsion containing 80 to 90 percent liquid fertilizer, 10 to 20 percent oil, and 0.6 to 1.0 percent surfactant. The product consists of small droplets of liquid fertilizer solution surrounded by a thin but essential impenetrable oil-surfactant layer. Water slowly dissolves the surfactant from the oil, thus breaking the emulsion and allowing the liquid fertilizer to be released. Ammonium phosphate, ammonium polyphosphate, ammonium nitrate, potassium chloride, uran solutions, and mixtures thereof, may be used as liquid fertilizers.
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5451243 *Jul 3, 1992Sep 19, 1995Kemira OyWater in oil emulsion
US5858055 *Oct 7, 1997Jan 12, 1999The Lubrizol CorporationWater-in-oil emulsion fertilizer compositions
WO1993016968A1 *Mar 5, 1992Sep 2, 1993Norsk Hydro AsMethod of transport and storage of fertilizer compositions
Classifications
U.S. Classification71/64.1
International ClassificationC05G3/00
Cooperative ClassificationC05G3/0041
European ClassificationC05G3/00B2K