Process for making ammonium glyphosate flakes

Details Process for making ammonium glyphosate flakes Process for making ammonium glyphosate flakes

A - Human Necessities

01

N

A01N 57/20 (2006.01) A01N 25/00 (2006.01)

Patent

CA 2377333

A process is provided for preparing ammonium glyphosate flakes, comprising (a) mixing (i) solid particulate glyphosate acid, (ii) water in an amount of about 0.5 to about 3 parts by weight per part by weight of glyphosate acid, and (iii) a base that supplies ammonium cations, in an amount of about 0.8 to about 1.25 mole equivalents of ammonia per mole of glyphosate acid, to form an aqueous reaction medium; (b) allowing the glyphosate acid to react with the base in the reaction medium to form a reaction product comprising a concentrated aqueous solution of ammonium glyphosate; (c) drying the reaction product by contact thereof with a heated surface to form, primarily by evaporation of water, a solid deposit on the heated surface; and (d) scraping the solid deposit off the heated surface to recover dry flakes of ammonium glyphosate.

L'invention concerne un procédé servant à préparer des flocons de glyphosate d'ammonium et comprenant les étapes suivantes : (a) mélange (i) d'acide de glyphosate à particules solides, (ii) d'eau à raison d'environ 0,5 à environ 3 parts en poids par part en poids d'acide de glyphosate et (iii) d'une base fournissant des cations ammonium à raison d'environ 0,8 à environ 1,25 équivalents molaires d'ammoniac par mole d'acide de glyphosate, afin d'obtenir un milieu de réaction aqueux; (b) réaction de l'acide de glyphosate avec la base dans le milieu de réaction afin de former un produit de réaction comprenant une solution aqueuse concentrée de glyphosate d'ammonium; (c) séchage du produit de réaction par contact de ce dernier avec une surface chauffée afin de former, principalement par évaporation d'eau, un dépôt solide sur la surface chauffée; et enfin (d) raclage du dépôt solide de la surface chauffée afin de récupérer des flocons secs de glyphosate d'ammonium.

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