Process for the crystallisation of mesotrione

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

2007-01-15

2011-11-22

Gonzalez, Porfirio Nazario (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur containing

Reexamination Certificate

active

08063253

ABSTRACT:
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.

REFERENCES:
patent: 2008/0194880 (2008-08-01), Dawson et al.
patent: 2002076934 (2002-10-01), None
patent: 2005035487 (2005-04-01), None
patent: 2005092846 (2005-10-01), None
patent: 2006021743 (2006-03-01), None

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