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US 4,844,734 AGranted
Process for the preparation of granular pesticide
AssigneeKao Corporation
InventorsTetsuji Iwasaki, Takuo Goto, Tadao Matsumoto
Life of this patent
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Abstract
A granular pesticide containing a surfactant as a synergist can be prepared by countercurrent spray drying under specified conditions. The obtained granular pesticide exhibits excellent fluidity and storage stability and is excellent in wettability and disintegratability.
Claims10
A process for the preparation of a granular agricultural pesticide comprising the steps of:
- (1) forming a concentrated aqueous mixture containing (a) a pesticide and (b) at least one surfactant selected from the group consisting of (b-1) quaternary ammonium salt cationic surfactants and (b-2) betaine, organic amino acid, amine oxide and imidazoline amphoteric surfactants, the weight ratio of (a) to (b) being between 1:0.5 and 1:20;
- (2) spraying said concentrated aqueous mixture in an upper part of a spray tower through spray nozzles having an orifice diameter of from 0.5 to 4.0 mm and a spray pressure of from 5 to 250 kg/cm.sup.2 ;
- (3) introducing an inert gas at a temperature of from 150.degree. to 300.degree. C. into a lower part of said spray tower;
- (4) removing said inert gas at a temperature of from 60.degree. to 120.degree. C. from an upper part of said spray tower;
- and
- (5) removing said granular pesticide from a lower part of said spray tower.
3 more elements
Dependencies are inferred from the claim text.