Process for the crystallisation of mesotrione

Details Process for the crystallisation of mesotrione Process for the crystallisation of mesotrione

C - Chemistry, Metallurgy

07

C

C07C 315/06 (2006.01) C07C 317/24 (2006.01)

Patent

CA 2636338

The invention relates to a process for selectively controlling the crystallisation mesotrione [2-(4-methylsulphonyl-2-nitrobenzoyl)cyclohexane-1 ,3-dione] from aqueous solution in which the aqueous mesotrione solution is introduced to a crystalliser containing seed crystals predominantly of the thermodynamically stable polymorph ("Form 1") in a semi-continuous or continuous manner. The invention further relates to a process for converting the metastable polymorph ("Form 2") of mesotrione to Form 1 by introducing an aqueous solution containing the former form to a crystalliser containing seed crystals predominantly of the latter form.

L'invention concerne un procédé destiné à réguler de manière sélective la cristallisation de formes polymorphes de la mésotrione. L'invention concerne en outre l'utilisation d'un procédé semi-continu ou continu destiné à réguler la formation polymorphe. L'invention concerne en outre un procédé destiné à convertir une forme polymorphe en une autre.

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