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Process for the preparation of granular pesticide

  • US 4,844,734 A
  • Filed: 05/29/1987
  • Issued: 07/04/1989
  • Est. Priority Date: 07/14/1986
  • Status: Expired due to Fees
First Claim
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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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