Method for the production of a particle-containing preparation of tetrahydro-3,5-dimethyl-1,3,5-thiadiazin-2-thione

US6693191B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Heinz Isak · Haßloch, DE
• Norbert Sendhoff · Havelsee, DE
• Franz Schutz · Neustadt, DE
• Jörg Therre · Worms, DE
• Michael Drogemuller · Uelzen, DE
• Dirk Franke · Birkenheide, DE
• Manfred Munzinger · Dirmstein, DE
• Alexander Weck · Freinsheim, DE
• Kirsten Burkart · Ludwigshafen, DE

Key dates

• Filing date: Feb 6, 2003
• Grant date: Feb 17, 2004
• Expiry date: Feb 6, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D285/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Described is a process for the preparation of a particulate tetrahydro-3,5-dimethyl-1,3,5-thiadiazine-2-thione product by combining a first aqueous solution comprising methylammonium N-methyldithiocarbamate with a second aqueous solution comprising formaldehyde, followed by separation and drying of the resulting solid, which comprises combining the first and the second aqueous solutions in such a way that the ratio between the concentrations of dithiocarbamate functions and of formaldehyde is essentially constant in the reaction mixture over time during the duration of the reaction.