Ammonium glyphosate compositions and process for their...

A - Human Necessities – 01 – N

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A01N 57/20 (2006.01)

Patent

CA 2444608

A process is provided for preparing a downstream processable ammonium glyphosate paste. The process includes mixing in a reactor (i) particulate glyphosate acid, (ii) ammonia, (iii) adjuvant, and (iii) water. The reaction of glyphosate acid with ammonia causes the generation of heat resulting in the partial evaporation of the water such that an ammonium glyphosate paste is formed, having a moisture content of about 2 % to about 20 % by weight. The addition of the adjuvant to the reactor (i) increases the rate at which the glyphosate acid and ammonia react to form ammonium glyphosate and/or (ii) reduces the flow resistance of the reaction mass as it is being conveyed to the product discharge region of the reactor. The ammonium glyphosate paste may then be further processed to form a granular herbicidal composition.

L'invention concerne un procédé permettant la préparation d'une pâte de glyphosate d'ammonium qui peut subir un traitement en aval. Ce procédé consiste à mélanger dans un réacteur (i) de l'acide de glyphosate en particules, (ii) de l'ammoniac, (iii) un adjuvant et (iv) de l'eau. La réaction de l'acide de glyphosate avec l'ammoniac entraîne la production de chaleur, provoquant une évaporation partielle de l'eau, de sorte qu'une pâte de glyphosate présentant une teneur en eau d'environ 2 à 20 % en poids est formée. L'adjonction de l'adjuvant dans le réacteur (i) augmente la vitesse à laquelle l'acide de glyphosate et l'ammoniac réagissent pour former du glyphosate d'ammonium et/ou (ii) diminue la résistance à l'écoulement de la masse réactionnelle au cours de son déplacement vers la zone de sortie du réacteur. La pâte de glyphosate d'ammonium peut ensuite être soumise à un traitement additionnel permettant la production d'une composition herbicide sous forme de granules.

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