Glyphosate is the leading pesticide in herbicides. Many people want to know about glyphosate formula. China's pesticide network Xiaobian has compiled three glyphosate herbicide formulations:
1, dialkyl phosphite method
It is obtained by adding, condensing and hydrolyzing glycine, dialkyl phosphite and paraformaldehyde as raw materials. The purity of the product is 95%, the total yield is 80%, and the cost is low.
2. Chloromethylphosphonic acid method
(1) Preparation of chloromethylphosphonic acid. The reaction is carried out with phosphorus trichloride and paraformaldehyde at 200-250 Â° C (corresponding pressure of 2.5-3.0 MPa) for 3-5 hours to obtain chloromethylphosphono-dichloride. The literature reports that the ratio is phosphorus trichloride: polyformaldehyde is 1.2-1.5:1 mole, the yield is 67% in the absence of catalyst, and the yield of Lewis acid can be increased to 80%-89%. Hydrolysis gives chloromethylphosphonic acid.
(2) Synthesis of glyphosate. Equimolar chloromethylphosphonic acid and glycine are refluxed in aqueous sodium hydroxide (pH > 10) for 10-20 hours, then acidified with hydrochloric acid. If acidified to pH = 4, it is a monosodium salt, and pH = 8.5 is a disodium salt.
3. Iminodiacetic acid method
(1) Preparation of iminodiacetic acid. The chloroacetic acid was reacted with aqueous ammonia in the presence of calcium hydroxide, acidified, and neutralized with sodium hydroxide to obtain a yield of 85%. Or using hydrocyanic acid as raw material, and reacting with formaldehyde and ammonia, the yield is 90%.
(2) Preparation of glyphosate. The reaction of iminodiacetic acid with formaldehyde and phosphorous acid in the presence of sulfuric acid to obtain glyphosate is obtained in a yield of 90%.
(3) Synthesis of glyphosate. The glyphosate is mixed with water and mixed with excess hydrogen peroxide in the presence of equimolar sulfuric acid to obtain glyphosate in a yield of 90%-95%.
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