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Method for processing mother solution of glyphosate

A glyphosate mother liquor and treatment method technology, applied in the field of acid mother liquor treatment, can solve the problems of incomplete recovery of mother liquor, waste of materials, increased production costs, etc.

Inactive Publication Date: 2008-06-11
莫一平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the production of glyphosate by the dialkyl phosphite method in the prior art produces a large amount of solid waste due to incomplete recovery of the mother liquor, and the glyphosate aqueous solution made after recovery contains salt, thereby causing waste of materials. Increase production costs, pollute the environment and other issues

Method used

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  • Method for processing mother solution of glyphosate
  • Method for processing mother solution of glyphosate
  • Method for processing mother solution of glyphosate

Examples

Experimental program
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Effect test

Embodiment 1

[0069] The glyphosate mother liquor obtained when glyphosate is produced by the dialkyl phosphite method contains about 23.5% hydrochloric acid, about 20% triethylamine, and about 3% glyphosate. Take such glyphosate mother liquor 1000ml into such as figure 1 The raw solution chamber I of the diffusion dialysis device, which is composed of recovery chamber II-diffusion dialysis membrane M-stock solution chamber I-diffusion dialysis membrane M in sequence and repeatedly, 3000ml of pure water enters the recovery chamber II, after 24 hours of diffusion dialysis, The recovery room obtains 1700ml concentration of hydrochloric acid of 0.98mol / L, and the recovery rate of hydrochloric acid is about 24%. The glyphosate mother liquor that stoste room obtains is 2300ml, and the pH value is about 0.96, is neutralized to about pH value about 11 with 30% sodium hydroxide solution, consumes 530ml of 30% sodium hydroxide solution altogether, leaves standstill layering, Recover about 310ml of ...

Embodiment 2

[0071] 1000ml glyphosate mother liquor enters such as image 3 The dilute electrodialysis device shown is composed of cathode chamber V-anion exchange membrane A-dilute chamber III-anion exchange membrane A-concentrated chamber IV-cation exchange membrane C-anode chamber VI and cathode ca and anode an on both sides. In chamber III, 1500ml of hydrochloric acid solution with a concentration of about 0.3mol / L enters concentrated chamber IV, the anolyte is 1mol / L sulfuric acid solution, and the catholyte is 1mol / L sodium hydroxide solution. 2 The electric current density electrodialysis is 78 hours, and the pH of the solution in the dilute chamber is about 9.5. It is 1.93mol / L hydrochloric acid that 2500ml concentration is recovered in the concentrated chamber, the recovery rate of hydrochloric acid is about 62.8%, and the average current efficiency is 35.7%. Obtain 1400ml of glyphosate mother liquor in the light room, neutralize it with 30% sodium hydroxide solution until the pH...

Embodiment 3

[0073] 1000ml glyphosate mother liquor enters such as Figure 4The dilute electrodialysis device shown is composed of cathode chamber V-cation exchange membrane C-dilute chamber III-anion exchange membrane A-concentrated chamber IV-cation exchange membrane C-anode chamber VI and cathode ca and anode an on both sides In chamber III, 1500ml of hydrochloric acid solution with a concentration of about 0.3mol / L enters concentrated chamber IV, the anolyte is 1mol / L sulfuric acid solution, and the catholyte is 1mol / L sodium hydroxide solution. 2 Electrodialysis at a high current density for 110 hours until the pH of the solution in the dilute chamber is about 2.3. It is 2.30mol / L hydrochloric acid that recovery to 3000ml concentration is 2.30mol / L in the concentration room, the recovery rate of hydrochloric acid is about 92.2%, and the average current efficiency is 32.1%. The catholyte was allowed to stand for stratification, and 220ml of triethylamine in the upper layer was separat...

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Abstract

The invention relates to a treatment method of glyphosate mother liquid, with high useful material recovery rate, low cost and low pollution, which uses diffusion dialysis electrodialysis or diffusion dialysis, and electrodialysis to recover at least one of alcaine, triethylamine, and glyphosate of mother liquid, wherein the mother liquid is treated via diffusion dialysis first to recover some alcaine, then treated via electrodialysis to recover most alcaine and triethylamine, therefore, the invention realizes the synchronous recovery of alcaine and triethylamine, the glyphosate of the mother liquid can be recovered as 7% or 10% glyphosate sodium salt, ammonium salt or isopropyl amine salt, or be recovered by as glyphosate raw pesticide. The invention is suitable for treating glyphosate mother liquid in the glyphosate production of dialkyl phosphate method.

Description

technical field [0001] The invention relates to a treatment method of glyphosate mother liquor, in particular to a treatment method of acidic mother liquor obtained when glyphosate is synthesized by dimethyl phosphite method. Background technique [0002] Glyphosate was first developed by Monsanto Company of the United States. It is a high-efficiency, low-toxicity, low-residue, broad-spectrum organic phosphine post-emergence herbicide. It is widely used in agriculture, forestry, animal husbandry, and gardening. The largest sales of pesticide varieties. [0003] There are four main production processes of glyphosate, namely chloroacetic acid method, iminodiacetic acid method (ie IDA method), dialkyl phosphite method and trialkyl phosphite method. Among them, the dialkyl phosphite method uses paraformaldehyde, glycine, and dialkyl phosphite as raw materials, and uses triethylamine as a catalyst to obtain glyphosate through addition, condensation, and acidolysis. The process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 莫一平张晓忠韦卫东
Owner 莫一平
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