Synthesis method of glyphosate potassium salt technical product

Abstract

The invention discloses a synthesis method of a glyphosate potassium salt technical product, belonging to the pesticide technical field. The synthesis method comprises the following process steps of: 1) mixing glyphosate, alkali with potassium ions which are positive ions, and water to react and form a glyphosate potassium salt aqueous solution, and controlling the pH value of the glyphosate potassium salt aqueous solution after the reaction; 2) reducing the temperature of the glyphosate potassium salt aqueous solution, dropwise adding an organic solvent in the glyphosate potassium salt aqueous solution under stirring to perform alcohol precipitation; and 3) filtering after the precipitation of crystals to obtain a wet potassium salt technical product, and then drying to obtain the glyphosate potassium salt technical product. The synthesis method of the glyphosate potassium salt technical product is reasonable in design, the content of the glyphosate obtained by the method is up to above 97%, the yield of the glyphosate potassium salt is above 98%; and compared with the glyphosate potassium salt yield of the prior art which is 20%, the efficiency is increased by nearly 5 times and every unit of energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of pesticides, in particular to a synthesis method of glyphosate potassium salt original drug. Background technique [0002] Glyphosate is the systemic herbicide with the largest sales volume and the fastest growth rate in the world, and with the successful development and popularization of glyphosate-transgenic crops and the shortage of energy sources, it has led to the sowing and promotion of biofuel crops. The production of phosphine offers new opportunities. [0003] Glyphosate (glyphosate), the chemical name is N-(phosphine carboxymethyl) glycine, the pure product is a non-volatile white solid, the specific gravity is 0.5, it melts at about 230 ° C, and it is accompanied by decomposition. The solubility in water at room temperature Only 1.2 grams, insoluble in common organic solvents, and its isopropylamine salt, potassium salt, ammonium salt, and sodium salt are soluble in water. Glyphosate is a syst...

AI Technical Summary

Problems solved by technology

[0005] The patent CN101186622A uses the crystallization of the relationship between solubility curves at different temperatures to obtain glyphosate potassium salt. However, due to the high solubility of glyphosate potassium salt, the solubility of glyphosate potassium salt at room temperature reaches more than 160 grams, and the concentration is as high as 60%. In order to obtain a larger amount of primary crystallization, the concentration of potassium salt must be increased as much as possible. When the concentration of potassium salt is too high, the viscosity will increase significantly and become very viscous. Not only does it require high mixing equipment, but the main reason is that the crystallization rate is not high. , the obtained mother liquor has a high content of potassium salt of glyphosate, and the utilization rate of the equipment is not high, which is uneconomical

Attempts to extract a well-formed solid from its potassium glyphosate brine solution using conventional organic solvents were unsuccessful