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New method for treating glyphosate mother liquor

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 poor soil dispersibility, high sodium chloride content, and sticky soil and other problems, to achieve the effect of improving weeding effect, significant economic benefits, and eliminating land salinization

Active Publication Date: 2006-08-30
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After repeated application of this kind of 10% glyphosate sodium brine solution containing more sodium chloride, the sodium chloride content in the soil will be too high, which will easily cause poor soil dispersion, sticky soil, and become sodium-alkaline soil, which will eventually lead to crop failure. cut production
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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  • New method for treating glyphosate mother liquor
  • New method for treating glyphosate mother liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In the 1000g alkali mother liquor after reclaiming triethylamine in the preparation glyphosate production process, first feed 25g of ammonia gas, then feed into 65g of carbon dioxide gas, after fully stirring, filter to obtain 113g of sodium bicarbonate. The filtrate was concentrated and filtered to obtain 32 g of ammonium chloride. 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.

Embodiment 2

[0022] In the 1000g alkali mother liquor after reclaiming triethylamine in the preparation glyphosate production process, first feed 75g of ammonia gas, then feed into 200g of carbon dioxide gas, after fully stirring, filter to obtain 343g of sodium bicarbonate. The filtrate was concentrated and filtered to obtain 42 g of ammonium chloride. 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.

Embodiment 3

[0024] Get the 1000g acidic mother liquor in the glyphosate production process, add the sodium bicarbonate 343g that produces in the embodiment 2, collect the carbon dioxide gas 151g that produces, the pH value after the reaction is 5.4, adds 30%NaOH516g again, the pH value is 11, divides layer, the upper layer gets 206g of triethylamine, and the lower floor mother liquor is distilled to get 13g of triethylamine; in the alkali mother liquor, first pass into 75g of ammonia gas, then pass into the collected carbon dioxide gas, and add 49g of carbon dioxide gas, after fully stirring, Filtration yielded 352 g of sodium bicarbonate. The filtrate was concentrated and filtered to obtain 41 g of ammonium chloride. 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 by using alkyl ester process. Said method is mainly characterized by that the ammonia gas and carbon dioxide gas are successively introduced into the neutralized 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 acidic mother liquor containing chloride ions (abbreviated as acid mother liquor) while producing the technical glyphosate, which contains a large amount of catalyst triethylamine used in synthesis. Domestic glyphosate manufacturers usually adopt liquid alkali neutralization process when dealing with the acid mother liquor to recover the catalyst triethylamine: add 30% sodium hydroxide solution to the acid mother liquor, adjust the pH value to 10-12, let it stand for stratification, and the upper layer It is triethylamine, which is recovered and reused in the synthesis of glyphosate. The lower layer is called alkaline mother ...

Claims

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Application Information

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IPC IPC(8): C07F9/34
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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