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Method for recycling glyphosate from glyphosate mother liquid

A technology of glyphosate mother liquor and glyphosate, which is applied in the field of recovering glyphosate from glyphosate mother liquor, can solve problems such as pollution, reduced separation efficiency, and poor performance of ion exchange resins, so as to reduce costs, reduce pollution, and improve The effect on product yield

Active Publication Date: 2012-11-21
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] For ion exchange resins, iron ions in the separation system can cause ion resin poisoning, and the anion resin is easily contaminated by organic matter in the liquid phase, making the resin black, reducing the separation efficiency, and the salt content in the separated liquid phase Will significantly affect the performance of the ion exchange resin, the higher the salt content, the worse the performance of the ion exchange resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Get glyphosate mother liquor 500g, glyphosate concentration is 1.0%, increases glyphosate concentration 2.4%, after treatment, adjusts its pH value to be 1.5, gets LS-36 anion adsorption resin 50ml and LS-18 adsorption anion adsorption 35ml resin, The resins were loaded into columns respectively and the resins were pretreated. The resin columns were connected in series, and the mother liquor of glyphosate was adsorbed on the columns. The adsorption temperature was 5°C, the flow rate was 2BV / h, and the recovery rate was 97.0%. After the adsorption is saturated, the first resin is desorbed with 4% sodium hydroxide solution at 60°C and a flow rate of 4BV / h. After the analysis solution is concentrated, the concentration of glyphosate is 11.5%, and the recovery rate of glyphosate is 11.5%. 95.8%, the second resin was desorbed with 4% hydrochloric acid solution, separated after concentration, and dried to obtain 4.81 g of glyphosate crystals with a glyphosate content of 98.7%....

Embodiment 2

[0049] Get glyphosate mother liquor 1000g, its glyphosate concentration is 1.3%, after treatment, adjust its pH value to 2.5, get LX-18 anion adsorption resin 50ml to pack and carry out pretreatment to resin, put glyphosate mother liquor on the column Adsorption, the adsorption temperature is 25°C, the flow rate is 10BV / h, and the recovery rate is 91.8%. After the adsorption is saturated, 8% sodium hydroxide solution is used for desorption at 50°C and a flow rate of 5BV / h to obtain a concentration of glyphosate sodium salt of 5.6%, and a desorption rate of 94.3%. Add hydrochloric acid to the glyphosate sodium salt solution to adjust the pH value to 1.5-2, precipitate, filter, and dry to obtain 11.55 g of glyphosate crystals with a glyphosate content of 97.4%.

Embodiment 3

[0051] Get 800g of glyphosate base mother liquor, its glyphosate concentration is 0.8%, after treatment, adjust its pH value to be 3.5, get H-103 anion adsorption resin 50ml packing column and carry out pretreatment to resin, put glyphosate mother liquor on Column adsorption, the adsorption temperature is 15°C, the flow rate is 5BV / h, and the recovery rate is 92.3%. After the adsorption is saturated, 25% ammonia water is used for desorption at 40° C. and a flow rate of 7.5 BV / h to obtain a glyphosate ammonium salt concentration of 12.8% and a desorption rate of 95.9%. Add hydrochloric acid to the glyphosate ammonium salt solution to adjust the pH value to 1.5-2, filter the precipitate, and dry to obtain 5.9 g of glyphosate crystals with a glyphosate content of 96.1%.

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Abstract

The invention relates to a method for recycling glyphosate from glyphosate mother liquid. The glyphosate mother liquid contains N,N-dimethylglycine, sulfate ion, ferric ion and impurities of arsenic ion, lead ion, mercury ion, and the like. The method comprises the following steps: adopting anion absorbent resin, in particular to anion absorbent resin with alkalescence to carry out absorption andseparation including resin separation by means of parallel connection or series connection to separate the glyphosate from the mother liquid, thereby improving the product yield, effectively reducingthe cost and reducing pollution.

Description

technical field [0001] The invention relates to a method for recovering glyphosate from glyphosate mother liquor, aiming at the high salt content of impurities containing N,N-dimethylglycine, sulfate ion, iron ion and arsenic, lead, mercury and other impurities The glyphosate mother liquor adopts anion adsorption resin, especially weakly basic anion adsorption resin, for adsorption separation and includes resin separation in parallel or in series, so as to separate glyphosate in the mother liquor, improve product yield, and effectively Reduce costs and reduce pollution. Background technique [0002] Glyphosate, also known as N-(phosphonomethyl)glycine, is a highly effective broad-spectrum herbicide. At present, there are mainly two production processes: IDA method and glycine method. Both production processes have the problem of disposing of glyphosate mother liquor. [0003] CN101190926 and CN1648131 adopt the method of passing ammonia gas into the glyphosate mother liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38B01D15/08
Inventor 王伟周曙光王硕姜胜宝吴建年揭少卫姜云珍
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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