Method for recycling glyphosate mother solution

A technology of glyphosate mother liquor and glyphosate, which is applied in the chemical industry, can solve the problems of complex catalytic oxidation process, low secondary oxidation efficiency, poor heat utilization rate, etc., and achieve the effect of good oxidation, reasonable design and thorough reaction

Active Publication Date: 2015-09-30
JIANGXI JINLONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Treatment methods such as the patented CN 103012474A electrocatalytic oxidation process are relatively complicated; CN101402652A only reduces the sodium chloride content in the mother liquor, and does not carry out effective resource recovery; CN103864040A perfo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Glyphosate and glyphosate mother liquor are produced by glycine method;

[0027] 2) Concentrate the glyphosate mother liquor to COD 60,000mg / L, Tp 40,000mg / L to obtain glyphosate mother liquor concentrate;

[0028] 3) Mix the concentrated glyphosate mother liquor with compressed air at a mass ratio of 80:14, adjust the oxygen content in the compressed air to 40% by adding liquid oxygen, and react for 30 minutes at a temperature of 240°C to obtain the glyphosate mother liquor Oxidizing solution;

[0029] 4) Cool the glyphosate mother liquor oxidation solution to 5°C for crystallization to obtain phosphate products, take out the crystallized glyphosate mother liquor oxidation solution and concentrate it with a nanofiltration membrane to obtain a concentrate and a permeate;

[0030] 5) The permeate is concentrated by mechanical vapor recompression technology or multi-effect evaporation technology to obtain sodium chloride product, and the distillate is reused;

[0031...

Embodiment 2

[0034] 1) Glyphosate and glyphosate mother liquor are produced by glycine method;

[0035] 2) Concentrate the glyphosate mother liquor to COD 50,000mg / L, Tp 30,000mg / L to obtain glyphosate mother liquor concentrate;

[0036] 3) Mix the concentrated glyphosate mother liquor with compressed air at a mass ratio of 80:12, adjust the oxygen content in the compressed air to 30% by adding liquid oxygen, and react for 50 minutes at a temperature of 220°C to obtain glyphosate mother liquor Oxidizing solution;

[0037] 4) Cool down the temperature of the glyphosate mother liquor oxidation solution to 0°C for crystallization to obtain phosphate products, take out the crystallized glyphosate mother liquor oxidation solution and concentrate it with a nanofiltration membrane to obtain the concentrate and permeate;

[0038] 5) The permeate is concentrated by mechanical vapor recompression technology or multi-effect evaporation technology to obtain sodium chloride product, and the distillate...

Embodiment 3

[0042] 1) Glyphosate and glyphosate mother liquor are produced by iminodiacetic acid method;

[0043] 2) Concentrate the glyphosate mother liquor to COD 60,000mg / L, Tp 50,000mg / L to obtain glyphosate mother liquor concentrate;

[0044] 3) Mix the concentrated glyphosate mother liquor with compressed air at a mass ratio of 80:16, adjust the oxygen content in the compressed air to 50% by adding liquid oxygen, and react for 30 minutes at a temperature of 260°C to obtain the glyphosate mother liquor Oxidizing solution;

[0045] 4) Cool the glyphosate mother liquor oxidation solution to 10°C for crystallization to obtain phosphate products, take out the crystallized glyphosate mother liquor oxidation solution and concentrate it with a nanofiltration membrane to obtain a concentrate and a permeate;

[0046] 5) The permeate is concentrated by mechanical vapor recompression technology or multi-effect evaporation technology to obtain sodium chloride product, and the distillate is reus...

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Abstract

The invention discloses a method for recycling glyphosate mother solution, and belongs to the technical field of chemical engineering. The method comprises the following steps: producing glyphosate and glyphosate mother solution by a glycine method or an iminodiacetic acid method; concentrating the glyphosate mother solution; carrying out an oxidization treatment on the glyphosate mother solution concentrate; cooling and crystallizing the glyphosate mother solution oxidation solution, taking out the crystallized glyphosate mother solution oxidation solution and concentrating; concentrating the permeate to obtain a sodium chloride product, and reusing the distillate; adjusting the pH value of the concentrate to 3-4, and then carrying out a photocatalytic oxidation reaction; adjusting the pH value to obtain a disodium hydrogen phosphate product or a trisodium phosphate product. According to the method disclosed by the invention, the concentration treatment is carried out before the glyphosate mother solution is oxidized, thus reducing the content of chloride ions in the glyphosate mother solution, increasing the concentration of the reactant, and increasing the efficiency of the subsequent oxidization reaction; hydrogen peroxide photocatalytic oxidation is carried out on the concentrate, the reaction is thorough, the oxidability is better, the substances difficult to oxidize by oxygen-enriched wet oxidization can be oxidized, and the reaction conditions are moderate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recycling glyphosate mother liquor. Background technique [0002] Due to its low toxicity, high efficiency, low residue, and broad-spectrum, glyphosate is the world's largest sales and fastest-growing pesticide variety, and it is accompanied by the successful development and popularization of glyphosate-based transgenic crops and energy shortages. The sowing and promotion of biofuel crops provides new opportunities for the production of glyphosate. [0003] There are two main synthetic methods for glyphosate production. One is the iminodiacetic acid method, which uses diethanolamine or hydrocyanic acid as the starting material. This method is commonly used by foreign companies such as Monsanto in the United States; the other is the alkyl ester method. , most domestic enterprises adopt this method. The main raw materials for the production of g...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B25/26C01D3/04C07F9/38
CPCY02P20/584
Inventor 潘力勇刘劭农黄伟果陆宗盛黄剑敏孙照玉何明金龙兴祥钟伟王富玲孙科
Owner JIANGXI JINLONG CHEM
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