Glyphosate dimethylamine salt crystal, preparation method and use thereof

The process for preparing a crystalline dimethylamine salt of glyphosate, including the steps:

• a) introducing a potion of a dimethylamine gas into an organic solvent;
• b) adding glyphosate powders under stirring and further introducing the left dimethylamine gas into the system, wherein the total mole number of the introduced dimethylamine gas is 1.0-1.4 times that of the glyphosate;
• the reaction temperature is between 40 and 90° C.;
• and the reaction time is 1.5-2.5 h;
• and then obtaining a clear liquid system;
• c) slowly lowering the temperature of the system to 15-25° C. and then adding a crystal seed of dimethylamine salt of glyphosate such that crystals are precipitated;
• and then separating the precipitated crystalline dimethylamine salt of glyphosate.