Glyphosate dimethylamine salt crystal, preparation method and use thereof

US9221853B2 · kind B2 · utility

Assignee

• ZHEJIANG WYNCA CHEMICAL INDUSTRY GROUP CO., LTD · CN

Inventors

• Wei Wang · Nanjing, CN
• Shuguang Zhou · Zhejiang, CN
• Long Qin · Shanghai, CN
• Bufan Ren · Jiande, CN
• Zhigang Qian · Jiande, CN
• Tao Liu · Shanghai, CN
• Huiling She · Jiande, CN
• Yaxian Zhang · Jiande, CN

Key dates

• Filing date: Oct 25, 2010
• Grant date: Dec 29, 2015
• Expiry date: Jan 1, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07B2200/13
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention provides the herbicidal active ingredient, a dimethylamine salt crystal of N-phosphonomethyl glycine (glyphosate), its preparation process and a solid formulation containing the crystalline dimethylamine salt of glyphosate as well as its application. Said preparation process comprises adding glyphosate and a suitable amount of solvent into a conventional reactor and introducing a dimethylamine gas for reaction, wherein the reaction temperature is controlled between 5 and 90° C. After the completion of the reaction, the temperature is reduced slowly to a certain value, a crystalline dimethylamine salt of glyphosate is precipitated (or precipitated after a crystal seed is added).