Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1988-02-22
1989-12-05
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 6412, 71 6413, 264 5, 264 14, C05C 900
Patent
active
048850217
ABSTRACT:
Heretofore, two approaches have been utilized to improve storage stability, particularly a reduction in the tendency for caking during storage, of freshly prepared urea particles: (1) treat the surface of freshly prepared urea particles with conditioning agents, or (2) incorporate, within the urea particles, by means of addition to the urea melt, certain chemicals which act as hardening agents. This invention is directed to approach (2) supra, and by way of coincidence, to a third approach, to wit, utilizing a gelling clay as said additive to also act as an in situ suspending agent in instances wherein said treated urea is utilized in the subsequent production of suspension type fertilizers. The particular class of additives are clays of the group comprising channelized 2:1 clay minerals, namely attapulgite (palygorskite) and sepiolite and are added to the urea in relatively small quantities such that, although they impart the improved desired characteristics, they do not detract substantially from other properties thereof.
REFERENCES:
patent: 4390483 (1983-06-01), Willems et al.
Lander Ferris H.
Petrusek Robert A.
Tennessee Valley Authority
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