C - Chemistry – Metallurgy – 05 – C
Patent
C - Chemistry, Metallurgy
05
C
71/23, 260/546.3
C05C 9/02 (2006.01)
Patent
CA 1089664
ABSTRACT OF THE DISCLOSURE The present invention relates to a new fertilizer compound of the ureaform type and to a method for the production thereof. The new ureaform compound is characterized by the low average degree of polymerization between urea and formaldehyde. The new compound has a nitrogen content of over 41% by weight and consists of cold water soluble nitrogen as the main fraction and cold water insolu- ble as the second fraction which is substantially free of hot water insoluble nitrogen. The new ureaform compound is obtained by the condensation of urea and formaldehyde at a correct ratio between the reagents and termination of the reaction at a stage wherein excessive polymerization is prevented. The reaction is carried out in a controlled system with a pH in the range of 3.5 to 4.2. In particular useful are the systems H3PO4-KH2PO4 and H3PO4 - NH4H2PO4. The new compound successfully conbines the advantage of both mineral water soluble nitrogen fertilizers and organic water insoluble slow-release nitrogen sources.
249231
Cohen Liuba
Greidinger Dahlia S.
Chemicals & Phosphates Ltd.
Kirby Eades Gale Baker
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