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Treatment method of glyphosate mother liquor

A technology of glyphosate mother liquor and treatment method, which is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc. The effect of improving the weed control effect and avoiding the emission of pollution

Active Publication Date: 2007-10-03
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After applying this kind of 10% glyphosate sodium salt solution containing more sodium chloride, the sodium chloride content in the soil is too high, which will easily cause poor soil dispersion, sticky soil, and become sodium-alkaline soil, causing damage to crops. Ultimately leading to reduced crop yield and quality
In addition, the herbicidal efficacy (quick action and thoroughness) of 10% glyphosate sodium salt solution is slightly inferior to that of other glyphosate preparations

Method used

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  • Treatment method of glyphosate mother liquor
  • Treatment method of glyphosate mother liquor

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Experimental program
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Effect test

Embodiment 1

[0020] In the production process of glyphosate preparation, 25g of ammonia gas was passed into 1000g of mother liquor after concentration and removal of sodium chloride, and then 65g of carbon dioxide gas was passed into. After fully stirring, centrifugation obtained 120g of sodium bicarbonate and filtrate. Add metered glyphosate acid to the filtrate until the glyphosate content is 10%, to obtain the finished 10% glyphosate aqueous solution.

Embodiment 2

[0022] In the production process of preparing glyphosate, 75g of ammonia gas was introduced into 1000g of the mother liquor after concentration and removal of sodium chloride, and then 200g of carbon dioxide gas was introduced. After fully stirring, 350g of sodium bicarbonate and filtrate were obtained by centrifugation. Add metered glyphosate acid to the filtrate until the glyphosate content is 10%, to obtain the finished 10% glyphosate aqueous solution.

Embodiment 3

[0024] Get the 1000g acidic mother liquor in the glyphosate production process, add the sodium bicarbonate 105g that produces in the embodiment 1, collect the carbon dioxide gas 53g that produces, the pH value after the reaction is 5.4, adds 30%NaOH880g again, the pH value is 11, divides layer, the upper layer got 206g of triethylamine, and the mother liquor of the lower layer was distilled to get 13g of triethylamine; the remaining alkaline mother liquor was concentrated, 41g of sodium chloride was removed to obtain 500g of concentrated mother liquor, and 28g of ammonia gas was introduced into the concentrated mother liquor , Pass into the carbon dioxide gas of collection again, and add carbon dioxide gas 20g, after fully stirring, filter and obtain 103g sodium bicarbonate. A metered amount of glyphosate acid is added to the concentrated filtrate until the glyphosate content is 10%, to obtain a 10% glyphosate aqueous solution.

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Abstract

The present invention relates to a treatment method of mother liquor obtained for synthesizing glyphosate. Said method is mainly characterized by that after the triethylamine is recovered and lots of by-product sodium chloride is removed from concentrated alkaline mother liquor, the ammonia gas and carbon dioxide gas are successively introduced into the alkaline mother liquor, fully reacted and filtered, the filtrate is treated and can be used for preparing glyphosate water preparation.

Description

technical field [0001] The invention relates to a new method for treating glyphosate mother liquor for preparing glyphosate by an alkyl ester method. Background technique [0002] Glyphosate is a herbicide that kills herbicides. At present, the domestic production of glyphosate mostly uses the alkyl ester method. This process produces a large amount of Na containing + Acidic mother liquor, which contains a large amount of catalyst triethylamine used in synthesis. Domestic glyphosate manufacturers usually adopt liquid alkali neutralization process when dealing with this kind of mother liquor to recover catalyst triethylamine: add 30% sodium hydroxide solution to the mother liquor, adjust the pH value to 10-12, let stand and separate, and the upper layer Triethylamine is recovered and reused in the synthesis of glyphosate. A small amount of triethylamine is obtained by rectification of the mother liquor in the lower layer, and the remaining part is concentrated to remove par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/36
Inventor 王伟刘侠周曙光邵振威秦龙李丽娟郑红朝佘慧玲
Owner ZHEJIANG XINAN CHEM INDAL GROUP