Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1982-11-15
1985-01-15
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 641, 528256, C05B 1500
Patent
active
RE0318019
ABSTRACT:
A clear, storable, aqueous solution of partially condensed urea and formaldehyde substantially free of formic acid supplies non-burning and slow-releasing plant food nitrogen when applied directly to the foliage of living grasses, and agricultural and ornamental plants or to soils having neutral or acid surfaces. The substantially ammonia free solution has a pH between 7.5 and 9.8 and contains added buffering agents so that between 0.05 and 0.30 milliequivalents of phosphoric acid are required to reduce pH of one gram to 7.0; and is prepared by the partial condensation of from 1.5 to 2.0 mols urea with 1.0 mol formaldehyde for 20 to 300 minutes at temperatures between 75.degree. and 90.degree. C. with between 0.05 and 0.3 milliequivalents of alkali hydroxide per gram of solution as catalyst.
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patent: 3677736 (1972-07-01), Formaini
patent: 3918952 (1975-11-01), Neumiller
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Powell, Urea Process Technology, Noyes Development Corp., Park Ridge, N.J., 1968, pp. 284-287.
Liquid Fertilizer Manual, NFSA, Peoria, Ill., 1967, pp. 17-1, 17-5, 17-6, 17-4.
Hawkeye Chemical Company
Lander Ferris H.
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