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Controlled release agricultural products and processes for making same

a technology of agricultural products and agricultural products, applied in the field of controlled release agricultural products, can solve the problems of high-priced extended release products in general not tailored, excessive consumption patterns of consumers for extensive use in agriculture, and limited existing products

Inactive Publication Date: 2005-05-19
NEW FERTILIZER TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a controlled release agricultural absorbent based product that can release agriculturally beneficial materials, such as fertilizers, insecticides, herbicides, and fungicides, over a period of time. The absorbent material used in the product contains capillaries / voids and is impregnated with the beneficial material. The absorbent material can be agglomerated into granules of a predetermined size. The invention also includes a holding substance that helps regulate the release of the beneficial material. The controlled release agricultural absorbent based product provides fine control over the release of the beneficial materials and can be used for a variety of agricultural purposes."

Problems solved by technology

The production costs of these materials vary, but all of these commercially available products have been judged by the consumers' spending patterns as too expensive for extensive use in agriculture.
In addition, these high priced extended release products are in general not tailored for the short growing periods of wheat and corn because they do not release their nutrients completely within the growing period of these crops.
When used for grasses, existing products are limited because of their high cost for use on lawns, gardens, parks, golf courses and commercial, governmental, and educational grounds.
The existing products are not extensively used for pasture lands because of the added processing cost of the fertilizer.

Method used

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  • Controlled release agricultural products and processes for making same
  • Controlled release agricultural products and processes for making same
  • Controlled release agricultural products and processes for making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091] Samples of controlled release urea were granulated using an 85% urea solution, with and without corn starch equal to 1% of the final product, and pre-heated perlite 3-S. The urea and corn starch were combined in a laboratory beaker. A laboratory scale homogenizer was used to evenly disperse the corn starch in the urea solution. In separate tests, a sufficient amount of perlite, both pre-heated to 300° F. and un-heated, was added to the urea / corn starch mixture to obtain almost complete absorption of the mixture. The mixture was removed from the beaker and allowed to solidify. Once the mixture had solidified and cooled, it was crumbled using a laboratory blender on the chop setting, and then screened to obtain −6+7 Tyler mesh (3.4 mm to 2.8 mm in diameter) fertilizer granules. These granules were then dried in a laboratory fluid-bed. The resulting materials were evaluated by placing 1 gm of sample in a test tube with 6 grams of water held at 75° F. for 1, 2, and 3 days, at whi...

example 2

[0092] A pilot plant was set-up where urea was melted by a steam tube melter then blended with water to make an 85% solution and continuously fed at 109 lb / hr to a mix tank equipped with a homogenizer where corn starch powder was added at the rate of 1 lb / hr. The urea solution and the mix tank were maintained at a temperature of 210° F. Expanded 3-S perlite was continuously fed to a fluid-bed pre-heater at 7 lb / hr where it was heated with air until it was 320° F. to 327° F. (No water was applied to the perlite before hand and no steam was used to exfoliate it.) The perlite and the urea / corn starch mixture were then fed to a pugmill where most of the urea / corn starch mixture was absorbed while being held at a temperature of 196-197° F. The resulting slurry of perlite containing urea and corn starch plus excess urea and corn starch mixture was fed to a second pugmill. Oversize granules produced during the pilot plant operation were milled utilizing a Jacobson knife-bladed hammermill t...

example 3

[0094] Eighteen (18) grams of expanded 3-S perlite was placed in a laboratory vessel having an agitator and small vent. 20 ml of water were added to the vessel and mixed with the perlite, and it was heated so that it steamed for 1 hour at 2200F. 350 grams of a mixture of 85% urea solution with 1% of corn starch homogenized with it was added to the steaming perlite and mixed well. The mixture was poured onto a plastic surface to harden and then crumbled in a lab blender. The crumbled material was screened to −6+10 Tyler mesh (3.4 mm to 1.7 mm in diameter) and dried in a lab fluid-bed. The resulting material had a bulk density of 35 lb / ft3. The material was then placed in a rotating drum and rounded by blowing hot air on it at 240° F. The bulk density of the resulting material was 38 lb / ft3.

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Abstract

A controlled release agricultural absorbent based product including particles of an absorbent material containing capillaries / voids between 10-200 microns in cross-sectional diameter which is impregnated in an amount of 40-95% of the capillaries / voids volume with an agriculturally beneficial material selected from the group consisting of fertilizers, insecticides, herbicides and fungicides, being produced by a process including steps of 1) introducing water to particles of absorbent material to result in absorption of water within the absorbent material, 2) heating the absorbent particles and water to transform the water within the absorbent particles to steam, 3) introducing the heated absorbent particles to an agriculturally beneficial material in aqueous solution to essentially saturate the absorbent particles with the agriculturally beneficial material, 4) granulating the combination of agriculturally beneficial material and saturated absorbent particles to solidify and harden the mixture, resulting in the agglomeration of absorbent particles into granules, and 5) drying the granules.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to controlled release agricultural products and processes for making such products. More particularly, the present invention is directed to particulate absorbents in particulate form and holding compositions in particulate form that provide for controlled release of agriculturally beneficial materials such as fertilizers, insecticides, herbicides and fungicides. The particulate absorbents contain capillaries / voids between 10-200 microns in cross-sectional diameter and are impregnated in an amount of 40-95% of the capillaries / voids volume with the agriculturally beneficial material. The process of the present invention forms the controlled release agricultural particulate absorbents by blending the absorbent with the agriculturally beneficial material(s) for a prescribed time. The blended absorbent is fed into a granulator and after screening, the product is dried. The process results in an easily handled, free flowing, contro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N25/12C05G3/00
CPCA01N25/12Y10S514/964C05G3/0047C05G5/40
Inventor PURSELL, TAYLORSHIRLEY, ARTHUR R. JR.COCHRAN, KEITH D.HOLT, TIMOTHY G.PEDEEN, GREGORY S.
Owner NEW FERTILIZER TECH LLC
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