Process for the preparation of granular pesticide
First Claim
Patent Images
1. 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/cm2 ;
(3) introducing an inert gas at a temperature of from 150°
to 300°
C. into a lower part of said spray tower;
(4) removing said inert gas at a temperature of from 60°
to 120°
C. from an upper part of said spray tower; and
(5) removing said granular pesticide from a lower part of said spray tower.
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Accused Products
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.
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Citations
10 Claims
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1. A process for the preparation of a granular agricultural pesticide comprising the steps of:
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(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/cm2 ; (3) introducing an inert gas at a temperature of from 150°
to 300°
C. into a lower part of said spray tower;(4) removing said inert gas at a temperature of from 60°
to 120°
C. from an upper part of said spray tower; and(5) removing said granular pesticide from a lower part of said spray tower. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification