Process for the preparation of urea-formaldehyde condensates to

Details Process for the preparation of urea-formaldehyde condensates to Process for the preparation of urea-formaldehyde condensates to

1977-03-08

1978-10-17

Lander, Ferris H.

Chemistry: fertilizers

Processes and products

Organic material-containing

71 64DB, 260555R, C05C 900

Patent

active

041206851

ABSTRACT:
Fertilizers with a slow and controlled release of nitrogen are obtained by condensing urea with formaldehyde in three condensation stages carried out under well-determined conditions of pH, temperature and formaldehyde/urea molar ratio and up to well-determined viscosities of the resulting product. The first stage is carried out in the presence of methanol, the second stage after addition of formic acid and the third stage after neutralization and addition of a further amount of urea. The condensation stages are followed by a terminal heat-treatment at 200.degree.-400.degree. C for 0.5 to 5 minutes.

REFERENCES:
patent: 3198761 (1965-08-01), O'Donnell
Clark et al., New Synthetic N.sub.2 Fert., Ind. & Eng. Chem., July 1948, pp. 1178-1183.

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