Preparation method of glyphosate sodium and glyphosate sodium preparation

Abstract

The invention provides a preparation method of glyphosate sodium and a glyphosate sodium preparation. The method comprises the following steps: alkaline materials containing sodium ion and solid glyphosate acid are put into a kneading machine to be reacted, the reaction temperature is 5 to 70 DEG C, the rotate speed of the kneading machine is 10 to 50 rpm, and the reaction time is 10 to 300 min. The invention further provides a glyphosate sodium preparation. The glyphosate sodium preparation comprises the following components in percentage by weight: 20 to 95 percent of the glyphosate sodium prepared through the method, 0 to 25 percent of a surface active agent, and 0 to 75 percent of other fills. The preparation method and the glyphosate sodium preparation have the advantages that the method is simple to operate, the reaction condition is mild, drying heat load is reduced, generated nitrosamine is reduced, antioxidants do not need to be added during the reaction process, the involvement of organic solvent is avoided at the same time, a third type of material does not need to be introduced, the pollution is low, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of pesticides, and in particular relates to a preparation method of sodium glyphosate and a sodium glyphosate preparation. Background technique [0002] Glyphosate is a systemic conduction type broad-spectrum herbicide. The pure product is a non-volatile white solid with a specific gravity of 0.5. It melts and decomposes at about 230°C. The solubility in water at room temperature is only 1.2 grams. In application, glyphosate acid is usually formulated into water-soluble salts. The glyphosate salt preparations that are currently used are glyphosate isopropylamine salt, glyphosate potassium salt, glyphosate ammonium salt and glyphosate Among them, ammonium glyphosate is the most widely used. [0003] At present, glyphosate formulations are still dominated by water preparations. Since water preparations contain a large amount of water, it brings inconvenience to packaging, transportation and storage, and at th...

AI Technical Summary

Problems solved by technology

[0003] At present, glyphosate formulations are still dominated by water preparations. Since water preparations contain a large amount of water, it brings inconvenience to packaging, transportation and storage, and at the same time increases costs. The demand for solid dosage forms is becoming more and more urgent

[0004] Chinese patent application 96196134.1 discloses a method for preparing glyphosate ammonium salt by reacting ammonia water with glyphosate, in which a large amount of water needs to be removed by drying with hot air, which has high energy consumption and low water removal efficiency. Long-term hot air drying causes the oxidation of glyphosate acid, which will generate nitrosamines whose content needs to be controlled. During the reaction, the antioxidant sodium sulfite needs to be added, which increases the production cost.

[0005] Chinese patent application 02141788.1 discloses a reaction in which glyphosate and water are first added, and then ammonia gas is introduced. After the reaction is complete, an aqueous solution of glyphosate ammonium salt is generated, and then the glyphosate ammonium salt is extracted by using an organic solvent to obtain Glyphosate ammonium salt solid, the method has fast reaction speed and simple operation, but adding an organic solvent increases the cost

[0006] Chinese patent application 200610154745.9 discloses a method for preparing solid glyphosate potassium salt. During the reaction, a large amount of water needs to be added, and the obtained solid wet product is dried to form the original drug of glyphosate potassium salt. The method has A large amount of mother liquor is generated, and it is not easy to crystallize, and the energy consumption is large and the cost is high