Preparing method for glyphosate
A technology of glyphosate and glyphosate, applied in the chemical industry, can solve the problems of complexity, high energy consumption, difficult disposal of by-products and mother liquor, etc., and achieve the effects of changing electron distribution, improving catalytic activity, and low formaldehyde content
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Embodiment 1
[0021] A preparation method of glyphosate includes the following steps:
[0022] (1) Synthesis of iminodiacetic acid: reacting hydrocyanic acid, formaldehyde and hexamethylenetetraammonium under the action of oxygen for 10h at a temperature of 40℃ to obtain iminodiacetonitrile, and then iminodiacetonitrile Prepare iminodiacetic acid by hydrolysis and acidification;
[0023] (2) Preparation of Glyphosate: react iminodiacetic acid, formaldehyde and phosphorus trichloride at 50°C for 2h to obtain Glyphosate;
[0024] (3) Preparation of glyphosate: add the glyphosate prepared in step (2) into the reaction kettle, pass an oxygen flow into the reaction kettle at a flow rate of 2L / min, and add activated carbon supported titanium dioxide catalyst and water in the reaction kettle Set the visible light source to irradiate, gradually heat the reactor to 80°C, stir, the reaction pressure in the reactor is 0.2~0.4MPa, and react for 3h;
[0025] Among them, the specific surface area of the origi...
Embodiment 2
[0029] A preparation method of glyphosate includes the following steps:
[0030] (1) Synthesis of iminodiacetic acid: reacting hydrocyanic acid, formaldehyde and hexamethylenetetraammonium under the action of oxygen for 12h at a temperature of 45℃ to obtain iminodiacetonitrile, and then iminodiacetonitrile Prepare iminodiacetic acid by hydrolysis and acidification;
[0031] (2) Preparation of Glyphosate: react iminodiacetic acid, formaldehyde and phosphorus trichloride at 55°C for 3 hours to obtain Glyphosate;
[0032] (3) Preparation of glyphosate: add the glyphosate prepared in step (2) into the reactor, and pass an oxygen flow into the reactor at a flow rate of 1.8L / min, and add activated carbon-supported titanium dioxide catalyst and water to the reactor. Set visible light source to irradiate, gradually heat the reactor to 80°C, stir, the reaction pressure in the reactor is 0.2~0.4MPa, and react for 3h;
[0033] Among them, the specific surface area of the original activated ca...
Embodiment 3
[0037] A preparation method of glyphosate includes the following steps:
[0038] (1) Synthesis of iminodiacetic acid: reacting hydrocyanic acid, formaldehyde and hexamethylenetetraammonium under the action of air for 8h at a temperature of 50℃ to obtain iminodiacetonitrile, and then iminodiacetonitrile Prepare iminodiacetic acid by hydrolysis and acidification;
[0039] (2) Preparation of Glyphosate: react iminodiacetic acid, formaldehyde and phosphorus trichloride at 45°C for 2 hours to prepare Glyphosate;
[0040] (3) Preparation of glyphosate: add the glyphosate prepared in step (2) into the reactor, and pass an oxygen flow into the reactor at a flow rate of 2.3 L / min, and add activated carbon-supported titanium dioxide catalyst and water to the reactor. Set visible light source to irradiate, gradually heat the reactor to 80°C, stir, the reaction pressure in the reactor is 0.2~0.4MPa, and react for 4h;
[0041] Among them, the specific surface area of the original activated carb...
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