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Method for synthesizing glyphosate at low cost

A glyphosate, low-cost technology, applied in chemical instruments and methods, herbicides and algicides, chemicals for biological control, etc., can solve the problems of pollution, high consumption, methanol recovery burden, etc. Pollution, downgrading costs and energy consumption, the effect of avoiding methanol recovery

Active Publication Date: 2010-11-03
SUZHOU JIAHUI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of the glycine route mainly includes: depolymerization, addition reaction, condensation reaction, hydrolysis reaction and crystallization. The whole production process needs to consume a large amount of solvent—methanol, which will inevitably cause certain pollution to the surrounding environment. Recycling is also a burden for businesses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Put 85kg of paraformaldehyde, 277kg of industrial methanol and 138kg of triethylamine into the reaction kettle respectively, turn on the stirring device and control the temperature of the kettle to 30°C, stir for 0.5h to obtain the depolymerization solution;

[0018] (2) After heat preservation and depolymerization, keep stirring and put 100kg of glycine into the reaction kettle, control the temperature at 30°C, and stir for 0.5h to carry out the addition reaction;

[0019] (3) After the insulation addition, put 178kg of dimethyl phosphite and 44kg of industrial methanol into the reaction kettle together, control the temperature at 45°C, and stir for 1 hour to carry out the condensation reaction;

[0020] (4) Control the temperature of the kettle at 40°C, put 510kg of hydrochloric acid with a concentration of 30% by weight into the reaction kettle, after adding the hydrochloric acid, raise the temperature to 110°C, heat preservation and desolvation for 1h, then stir ...

Embodiment 2

[0022] (1) Put 90kg of paraformaldehyde, 400kg of industrial methanol and 140kg of triethylamine into the reaction kettle respectively, turn on the stirring device and control the temperature of the kettle to 40°C, and stir for 1 hour to obtain the depolymerization solution;

[0023] (2) After heat preservation and depolymerization, keep stirring and put 108kg of glycine into the reaction kettle, control the temperature at 40°C, and stir for 1h to carry out the addition reaction;

[0024] (3) After the insulation addition, put 190kg of dimethyl phosphite and 180kg of industrial methanol into the reaction kettle together, control the temperature at 50°C, and stir for 2 hours to carry out the condensation reaction;

[0025] (4) control the temperature of the kettle at 45°C, put 550kg of hydrochloric acid with a concentration of 35% into the reactor, add the hydrochloric acid, and then raise the temperature to 120°C, heat preservation and precipitation for 1.5h, then stir and cool...

Embodiment 3

[0027] (1) Put 96kg of paraformaldehyde, 510kg of industrial methanol and 145kg of triethylamine into the reaction kettle respectively, turn on the stirring device and control the temperature of the kettle to 50°C, and stir for 2 hours to obtain the depolymerization solution;

[0028] (2) After heat preservation and depolymerization, keep stirring and put 115kg of glycine into the reaction kettle, control the temperature at 45°C, and stir for 2h to carry out the addition reaction;

[0029] (3) After the heat preservation addition, put 195kg of dimethyl phosphite and 277kg of industrial methanol into the reaction kettle together, control the temperature at 60°C, and stir for 3 hours to carry out the condensation reaction;

[0030] (4) Control the kettle temperature at 50°C, put 590kg of hydrochloric acid with a weight percentage concentration of 35% into the reactor, after adding the hydrochloric acid, raise the temperature to 135°C, heat preservation and precipitation for 2 hou...

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Abstract

The invention relates to a method for synthesizing glyphosate at low cost, which comprises the following steps: (1) putting paraformaldehyde, methanol and triethylamine in a reaction kettle, controlling the kettle temperature to be at 30-50 DEG C, and stirring for 0.5-2 hours; (2) putting glycine into the reaction kettle, controlling the temperature to be at 30-45 DEG C, and stirring to react for 0.5-2 hours; (3) putting dimethyl phosphite and methanol into the reaction kettle, controlling the temperature to be at 45-60 DEG C, and stirring to react for 1-3 hours; (4) and controlling the kettle temperature to be at 40-50 DEG C, putting hydrochloric acid into the reaction kettle, heating to 110-135 DEG C, desolventizing for 1-2 hours, crystallizing, filtering under reduced pressure and drying to obtain the glyphosate raw powder. Compared with the prior art, by changing the mode of putting methanol, methanol can be saved by 10-15% per batch, thereby reducing the consumption of methanol, saving the cost and increasing the utilization ratio of workshop appliances.

Description

technical field [0001] The invention relates to a synthesis method, in particular to a method for synthesizing glyphosate at low cost. Background technique [0002] As a broad-spectrum herbicide, glyphosate has become the most widely used and produced pesticide product in the world due to its special herbicidal effect. In recent years, with the development of transgenic glyphosate-resistant crops, the amount of glyphosate has been increasing year by year. At present, the synthetic production of glyphosate mainly adopts two routes: IDA route and glycine route. Foreign glyphosate manufacturers mainly use the IDA route to produce glyphosate; while my country is one of the main glyphosate producers, most domestic glyphosate manufacturers use the glycine production route independently developed by my country. The production process of the glycine route mainly includes: depolymerization, addition reaction, condensation reaction, hydrolysis reaction and crystallization. The whole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38A01P13/00
Inventor 田晓宏张李伟卫一龙刘建波
Owner SUZHOU JIAHUI CHEM
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