Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1985-01-07
1986-03-25
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 6408, C05C 900
Patent
active
045781052
ABSTRACT:
A method for producing storage stable ureaform dispersion fertilizers by: reaction of urea and monomethylolurea in aqueous solution at a pH between 3.0 and 4.5 with a temperature between 25.degree. and 75.degree. C. until between 15 and 40 percent of the total nitrogen has been converted to form a dispersion of finely divided water insoluble ureaform particles; neutralizing; and admixing a water-insoluble, film-forming oil until the dispersed ureaform particles are coated with sufficient oil to prevent contact between the ureaform particles and the aqueous solution. The water insoluble, film-forming oils found effective include fatty acids, fatty acid esters, castor oil, castor oil esters, alkoxylated castor oils, and alkoxylated alkyl phenols. The amount of film-forming oil required to coat the ureaform particles is between 0.1 and 1.0 percent of the aqueous ureaform dispersion. To prevent settling of the coated ureaform particles a xanthan gum, or iota carrageenan thickener is added.
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Hawkeye Chemical Company
Lander Ferris H.
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