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Glyphosate mother liquid treating method

A glyphosate mother liquor and treatment method technology, applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems such as decline, poor soil dispersibility, and crop damage, and avoid Emission of pollution, effect of weed control improvement

Active Publication Date: 2005-10-05
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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  • Glyphosate mother liquid treating method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 1000g of the concentrated mother liquor in the production process of glyphosate, add 250g of ammonium bicarbonate, stir well at 10°C to 50°C and then filter to obtain 435g of precipitate (precipitation of sodium bicarbonate) and 800g of filtrate. Add metered glyphosate acid to the filtrate until the glyphosate content is 10%, to obtain a 10% glyphosate aqueous solution.

Embodiment 2

[0021] Take 1000g of concentrated mother liquor in the production process of glyphosate, add 350g of ammonium bicarbonate, stir well at 10°C-50°C, and then filter to obtain 500g of precipitate (precipitation of sodium bicarbonate) and 845g of filtrate. Add metered glyphosate acid to the filtrate until the glyphosate content is 10%, to obtain a 10% glyphosate aqueous solution.

Embodiment 3

[0023] Take 1000g of the concentrated mother liquor in the glyphosate production process, add 150g of ammonium bicarbonate, stir well at 10°C to 50°C, and then filter to obtain 295g of precipitate (sodium bicarbonate precipitate) and 844g of filtrate. Add metered glyphosate acid to the filtrate until the glyphosate content is 10%, to obtain a 10% glyphosate aqueous solution.

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Abstract

This invention relates to a treatment method of mother liquid from alkyl esterification composing glyphosate. This method mainly reclaims TEA, condenses alkali mother liquid to get off large amount of byproduct soldium chloride, after which adds ammonium bicarbonate in the alkali mother liquid, fully reacts, filters to collocate glyphosate solution. This invention can not only get rid of the alkalization problem cause by too much sodium chloride in glyphosate, and also improves the medical effect of this solution collocated by this method, and lower the cost and save the energy consumption.

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 (acid mother liquor for short), contains catalyst triethylamine used in a large amount of synthesis in the mother liquor. 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38
Inventor 王伟刘侠周曙光邵振威秦龙李丽娟佘慧玲郑红朝
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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