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Continuous hydrolysis process for preparing glyphosate by glycine method

A technology of glyphosate and glycine, applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, organic chemistry, etc., can solve the problem of failure to realize the continuous reaction of the whole process of hydrolysis, failure to achieve ideal results, etc. problems, to achieve remarkable energy-saving effects, easy control, and prolong the service life of the device

Active Publication Date: 2017-01-11
SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the experimental scheme in the literature, the methylal gas generated during the acid addition process will form a rush when it enters the reaction tower, which cannot achieve the desired effect, and fails to realize the continuous reaction of the whole hydrolysis process.

Method used

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  • Continuous hydrolysis process for preparing glyphosate by glycine method
  • Continuous hydrolysis process for preparing glyphosate by glycine method
  • Continuous hydrolysis process for preparing glyphosate by glycine method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The continuous hydrolysis process for preparing glyphosate by glycine method, the specific steps of the process are:

[0039] A The condensation reaction synthesis liquid is fed into the mixing reactor through a pump, and the material temperature is controlled at 53°C to complete the acid neutralization process;

[0040] B. The material discharged from the heat exchanger is separated from gas and liquid, and the liquid and the condensed gas enter the methylal recovery tower respectively to recover the methylal;

[0041] C The bottom liquid discharged from the methylal recovery tower enters the methanol recovery tower to recover methanol; the bottom liquid discharged from the methanol recovery tower enters the hydrolysis tower to complete the hydrolysis reaction;

[0042] D The bottom liquid discharged from the hydrolysis tower is flashed to remove water and acid, and then enters the crystallization kettle, where it is cooled and crystallized under stirring to obtain glyphosate. ...

Embodiment 2

[0044] The continuous hydrolysis process for preparing glyphosate by glycine method, the specific steps of the process are:

[0045] A The condensation reaction synthesis liquid is fed into the mixing reactor through a pump, and the material temperature is controlled at 50°C to complete the acid neutralization process;

[0046] B. The material discharged from the heat exchanger is separated from gas and liquid, and the liquid and the condensed gas enter the methylal recovery tower respectively to recover the methylal;

[0047] C The bottom liquid discharged from the methylal recovery tower is controlled at 80℃ and enters the methanol recovery tower to recover methanol; the bottom liquid discharged from the methanol recovery tower is controlled at 105℃ and enters the hydrolysis tower to complete the hydrolysis reaction ;

[0048] D The bottom liquid discharged from the hydrolysis tower is flashed to remove water and acid, and then enters the crystallization kettle, where it is cooled a...

Embodiment 3

[0050] The continuous hydrolysis process for preparing glyphosate by glycine method, the specific steps of the process are:

[0051] A. Feed the condensation reaction synthesis liquid into the mixing reactor through a pump, and control the material temperature at 55°C to complete the acid neutralization process;

[0052] B. The material discharged from the heat exchanger is separated from gas and liquid, and the liquid and the condensed gas enter the methylal recovery tower respectively to recover the methylal;

[0053] C The bottom liquid discharged from the methylal recovery tower is controlled at 70°C and enters the methanol recovery tower to recover methanol; the bottom liquid discharged from the methanol recovery tower is controlled at 90°C and enters the hydrolysis tower to complete the hydrolysis reaction ;

[0054] D The bottom liquid discharged from the hydrolysis tower is flashed to remove water and acid, and then enters the crystallization kettle, where it is cooled and cry...

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Abstract

The invention provides a continuous hydrolysis process for preparing glyphosate by a glycine method. The process comprises following specific steps: (A) conveying a condensation reaction synthetic solution into a mixing reactor by a pump and controlling a material temperature to be lower than 55 DEG C to finish an acid adding and neutralizing process; (B) carrying out gas-liquid separation on materials discharged by a heat exchanger and enabling condensed gas and liquid to respectively enter a methylal recycling tower to recycle methylal; (C) enabling kettle bottom liquid discharged from the methylal recycling tower to enter a methanol recycling tower to recycle methanol; enabling kettle bottom liquid discharged from the methanol recycling tower to enter a hydrolysis tower to finish a hydrolysis reaction; and (D) carrying out flash evaporation on kettle bottom liquid discharged from hydrolysis tower; removing water and acid and enabling the kettle bottom liquid enter a crystallization kettle; and cooling and crystallizing under agitation to obtain the glyphosate.

Description

Technical field [0001] The invention relates to the field of glyphosate production, in particular to a continuous hydrolysis process for preparing glyphosate by a glycine method. Background technique [0002] Glyphosate is an environment-friendly broad-spectrum herbicide that can effectively remove 76 of the 78 most harmful weeds in the world. As my country has joined the WTO and people’s requirements for the living environment have increased, glyphosate is in line with the development direction of the world's pesticide industry with its high efficiency, low toxicity, broad spectrum, and no residue. It is the most brilliant chemical pesticide in the world in the 20th century. With the rapid promotion of global glyphosate-resistant genetically modified crops in the 21st century, its market prospects will be broader. [0003] The glycine method occupies the domestic leading position in the production of glyphosate. The most critical link in the glycine method preparation route that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38
Inventor 王蕾姜永红杨国华刘军
Owner SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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