Urea-Formaldehyde Plant Nutrient Solution Containing High Levels of Slow Release Nitrogen
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United States of America Patent
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Issued Date -
Sep 2, 2004
app pub date -
Feb 27, 2003
filing date -
Feb 27, 2003
priority date (Note) -
Abandoned
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Abstract
The present invention provides a one-stage method of preparing a urea-formaldehyde plant nutrient solution with high percentage of Slow Release Nitrogen (SRN) moiety and low amounts of methylol by-products. A solution of formalin is reacted with urea in the presence of small amount of alkaline material to maintain a pH greater than 7. After the urea has dissolved, an ammonia reactant is added to the reaction mixture. The reaction mixture is exothermically (and, if needed, externally) heated to at least about 90.degree. C. and held for about 70-75 minutes, during which a calculated amount of alkaline material is added, typically in three portions over the first 45 minutes of the 70-75 minute period.
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