Method for preparing solid glyphosate potassium salt

Abstract

The invention provides a preparation method of glyphosate potassium salt solid wet product or relative raw pesticide, which comprises mixing solid glyphosate with some water, to be added and reacted with alkali containing potassium cation, controlling the reaction temperature, cooling, crystallizing and drying to obtain glyphosate potassium salt drug. The invention further provides a preparation method of glyphosate potassium salt raw pesticide, which comprises that solid glyphosate is mixed some water, to be added and reacted with alkali containing potassium cation, the reaction mixture is directly dried to obtain glyphosate potassium salt raw pesticide. The invention further provides a high-content soluble solid glyphosate potassium salt. The inventive glyphosate potassium salt raw pesticide, compared with other glyphosate potassium salts, has better weeding speed and rain resistance in same conditions, while the potassium ions on leaf and in soil can be effectively absorbed by plantto feed potassium fertilizer. And the invention has simple package, storage and transmission of prepared glyphosate potassium salt raw pesticide, to reduce cost.

Description

technical field [0001] The invention relates to the preparation of a herbicide solid used in agriculture and other places that need to control weeds or other plants. Specifically, it relates to a method for preparing a solid potassium salt of N-phosphoromethylglycine (glyphosate), an herbicidal active ingredient. Background technique [0002] Glyphosate is a broad-spectrum herbicide, but due to the low solubility of glyphosate acid in water, in practical applications, glyphosate acid is usually prepared as a water-soluble salt. Currently the most widely used are glyphosate isopropylamine salt, glyphosate ammonium salt, glyphosate potassium salt, glyphosate sodium salt, etc. [0003] At present, glyphosate formulations are still dominated by aqueous formulations, which cause inconveniences in packaging, transportation, and storage due to the large amount of solvent water contained in aqueous formulations, and increase costs at the same time. With the development and demand ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application 96196134.1 discloses a method for preparing ammonium glyphosate by reacting ammonium hydroxide solution with glyphosate acid, in which a large amount of water needs to be removed by drying with hot air, which has high energy consumption and high water removal efficiency not tall

[0007] At present, potassium salt of glyphosate is still an aqueous product. Up to now, no literature report on the solid preparation method of potassium salt of glyphosate has been found, and due to the different properties of raw materials and products, the method for preparing the original powder of ammonium salt is as above. , can not get potassium salt technical or can not get high-quality potassium salt technical and its solid preparation

[0008] Its reason is because glyphosate potassium salt is more soluble in water than glyphosate ammonium salt on the one hand, crystallization difficulty increases; The combination is relatively firm and difficult to remove by conventional methods such as heating

In addition, it is currently difficult to find a conventional organic solvent that can extract a well-formed solid from its system

Images