Water aqua preparation method based on purification of glyphosate mother liquor

A technology of glyphosate mother liquor and glyphosate water solution, which is applied in the fields of herbicides and algicides, botany equipment and methods, chemicals for biological control, etc. Problems such as treatment methods, to achieve the effect of reducing the amount of glyphosate mother liquor, simple working principle, and reducing environmental pollution

Active Publication Date: 2015-04-22
SICHUAN BEIER CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the continuous maturity of glyphosate production technology, in order to overcome the limitations of existing glyphosate technical barriers, a process route for preparing glyphosate by IDAN method has emerged, which can effectively control the production cost of glyphosate Among them, the glyphosate production section adopts the method of one-step oxidation of diglyphosate with air or oxygen. The glyphosate mother liquor produced by this method has simple components. Patent CN101591084 (a method for treating glyphosate wastewater that reduces carbon dioxide emissions, 2009.12.02) , CN101525351 (a treatment process of glyphosate mother liquor, 2009.09.09), CN101348299 (a treatment method of glyphosate synthesis mother liquor, 2009.01.21), CN101648755 (a kind of low discharge of glyphosate wastewater and the recovery and utilization of mother liquor method, 2010.02.17) etc. have elaborated in detail the separation and purification of glyphosate mother liquor by using membrane separation method. Glyphosate concentrated mother liquor does not mention feasible treatment methods

Method used

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  • Water aqua preparation method based on purification of glyphosate mother liquor
  • Water aqua preparation method based on purification of glyphosate mother liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In the IDAN method, the reaction mechanism for preparing glyphosate by air or oxygen oxidation is as follows:

[0036]

[0037] Among them, PMIDA: bis-glyphosate; PMG: glyphosate.

[0038] From the above reaction, it can be seen that the product of the air or oxygen oxidation process is relatively pure, and the reaction mother liquor is mainly formaldehyde, entrained with glyphosate and a small amount of diglyphosate that has not completely reacted, and the process has strict requirements on the quality of diglyphosate. The reaction mother liquor hardly contains sodium chloride, only contains formaldehyde and a small amount of organic or inorganic impurities, which greatly reduces the difficulty of reusing the reaction mother liquor, and its components are even less after membrane separation and powder extraction. Therefore, the present invention Specifically for the glyphosate production route of the IDAN method using iminodiacetonitrile as raw material, a water pre...

Embodiment 2

[0048] The difference between this example and Example 1 is that in step (1), alkali is added to adjust the pH of the glyphosate mother liquor. The removal rate of impurity iron ions in the concentrated mother liquor of glyphosate is greater than 80%.

[0049] In the actual operation process, the alkali can be mixed with alkaline substances such as sodium hydroxide and water to prepare an alkaline solution with a concentration of 10%.

Embodiment 3

[0051] The difference between this embodiment and Example 2 is that sodium carbonate and sodium bicarbonate are mixed with water to form an alkaline solution with a concentration of 50% to adjust the pH value of the glyphosate mother liquor, and obtain a grass with a pH value of 4. After the glyphosate mother liquor is filtered, the removal of impurity iron ions in the concentrated glyphosate mother liquor can be completed, and the removal rate is greater than 80%.

[0052] In this example, the purpose of removing iron ions is that the presence of iron ions has a greater impact on glyphosate water, which is embodied in the following two aspects. First, the existence of iron ions will destroy the balance of soil structure , resulting in the enrichment of iron ions; on the other hand, the molecular structure of glyphosate contains phosphonic acid carboxyl and amine groups, etc., which can undergo complexation reactions with metal ions, resulting in the degradation and failure of ...

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Abstract

The invention discloses a water aqua preparation method based on the purification of glyphosate mother liquor. The glyphosate mother liquor is sourced from the preparation process of the glyphosate, the glyphosate raw powder is crystallized after the pmida is oxidized, the glyphosate waste water remains after the solid-liquid separation, and then the glyphosate waste water is filtered, purified and concentrated by virtue of the membrane separation to separate out the glyphosate crystals so as to obtain the glyphosate mother liquor. The water aqua preparation method comprises the following steps: purifying the glyphosate mother liquor by virtue of impurity removal means such as pH adjustment and adsorption by active carbon to meet the preparation requirement of the glyphosate water aqua, and adding the glyphosate raw powder into the glyphosate water aqua, and ammonifying the mixture to obtain the glyphosate water aqua conforming to the national standard. By adopting the method, the further utilization of the phosphorus resource can be realized, the formaldehyde content in the prepared glyphosate water aqua is far lower than the requirement stipulated in the national standard, the stability of the glyphosate water aqua is improved, the recycling of the glyphosate mother liquor is realized, the environmental pollution is also reduced, and the social benefit is good.

Description

technical field [0001] The invention relates to a preparation method of water preparation based on glyphosate mother liquor purification treatment, in particular to a preparation process of purifying glyphosate mother liquor after membrane separation to obtain water preparation, and belongs to the field of glyphosate mother liquor treatment. Background technique [0002] Glyphosate is a systemic conduction-type organic phosphine herbicide first successfully developed by Monsanto in the United States in the 1970s. Its low toxicity, high efficiency, and broad-spectrum characteristics make it the focus of widespread attention around the world. Until the 1990s, Monsanto Patents in various countries have expired one after another, resulting in a rapid increase in glyphosate production. In the prior art, the commonly used synthesis routes of glyphosate can be divided into glycine route (alkyl ester method) and iminodiacetic acid (IDA method) route. In my country, the glycine metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N57/20A01N25/02A01N25/30A01P13/00
Inventor 王国成余林春刁正坤彭霞青卫平
Owner SICHUAN BEIER CHEM GROUP
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