Highly available particulate controlled release nitrogen fertili

Details Highly available particulate controlled release nitrogen fertili Highly available particulate controlled release nitrogen fertili

1998-08-13

2000-04-11

Griffin, Steven P.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 6411, 71 11, 71 27, 71 28, 71 29, 71 30, A01N 2500, C05C 300, C05C 900, C05C 902

Patent

active

060483784

ABSTRACT:
A method preparing controlled release nitrogen in particulate fertilizers which exhibit single growing season availabilities to plants of about 80 percent or higher. The method utilizes relatively low urea and ammonia to formaldehyde mol ratios of about 1.7 urea to 0.1 ammonia to 1 formaldehyde to assure high conversions to controlled release nitrogen with low free ureas, and carefully controlled elevated temperatures, acid dehydration condensation catalyst concentrations and short dehydration reaction times of about 2-4 minutes to provide effective conversion of hydroxymethyl nitrogen compounds by dehydration condensation reaction to controlled release methylene nitrogen compounds. Quick neutralization of the dehydration catalyst in a turbulent mixing reactor minimizes the formation of undesirable methylene nitrogen polymers which are hot water insoluble and unavailable to plants in a single growing season.

REFERENCES:
patent: 5266097 (1993-11-01), Moore

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