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Comprehensive treatment process for glyphosate mother liquor

A glyphosate mother liquor and comprehensive treatment technology, which is applied in the field of glyphosate mother liquor recovery and treatment, can solve the problems of polluting the environment, difficulty in reusing waste liquid or waste, and high processing costs

Inactive Publication Date: 2019-11-01
刘德亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a comprehensive treatment process for glyphosate mother liquor, to solve the incomplete material treatment in the existing glyphosate mother liquor recovery treatment method, resulting in waste liquid or waste that is difficult to reuse, high treatment cost and environmental pollution issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Take 5500g of the acidic mother liquor obtained by the production of glyphosate by the glycine method, which is strongly acidic, heat up to 100°C under normal pressure, filter the precipitated triethylamine hydrochloride while heating and concentrating, and return the filtrate to the mother liquor , 1500g of water was distilled off to obtain 2265.2g of triethylamine hydrochloride and 1734.8g of glyphosate mother liquor concentrate, and the glyphosate mother liquor concentrate was strongly acidic.

[0102] Cool the glyphosate mother liquor concentrate to 25°C, add 1000g of triethylamine, adjust the pH of the solution to 14, then add 651.2g of sodium liquid caustic soda, neutralize to pH=14, obtain 3386.2g of mother liquor, heat to 50°C, After standing for 2 hours, the solution was divided into 3 layers. After separation, 300 g of triethylamine in the upper layer, 1795 g of a solution containing triethylamine hydrochloride in the middle layer and 1290 g of a sodium salt so...

Embodiment 2

[0107] Take 5500g of the acidic mother liquor obtained by the glycine method to produce glyphosate, its pH=0.8, raise the temperature to 120°C under normal pressure, filter the precipitated triethylamine hydrochloride while heating and concentrating, and return the filtrate to the mother liquor , 1500g of water was distilled off to obtain 2265.2g of triethylamine hydrochloride and 1734.8g of glyphosate mother liquor concentrate, and the pH of the glyphosate mother liquor concentrate was 0.8.

[0108] Cool the glyphosate mother liquor concentrate to 25°C, add 200g of triethylamine, adjust the pH of the solution to 2, then add 651.2g of sodium caustic soda, neutralize to pH=7, obtain 2586.2g of mother liquor, heat to 100°C, After standing still for 2 hours, the solution was divided into two layers. After separation, 1296g of the solution containing triethylamine hydrochloride in the upper layer and 1290g of the sodium salt solution of organic phosphorus in the lower layer were ob...

Embodiment 3

[0113] Take 5500g of the acidic mother liquor obtained by the production of glyphosate by the glycine method, which is strongly acidic, heat up to 130°C under normal pressure, filter the precipitated triethylamine hydrochloride while heating and concentrating, and return the filtrate to the mother liquor , 1500g of water was distilled off to obtain 2265.2g of triethylamine hydrochloride and 1734.8g of glyphosate mother liquor concentrate, and the glyphosate mother liquor concentrate was strongly acidic.

[0114] Cool down the glyphosate mother liquor concentrate to 25°C, add 1500g of triethylamine, adjust the pH of the solution to 14, then add 651.2g of sodium liquid caustic soda, neutralize to pH=14, obtain 2386.2g of mother liquor, heat to 25°C, After standing for 2 hours, the solution was divided into 3 layers, and 800 g of triethylamine in the upper layer, 1796 g of a solution containing triethylamine hydrochloride in the middle layer and 1290 g of a sodium salt solution of o...

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Abstract

The invention provides a comprehensive treatment process for a glyphosate mother liquor. The process includes subjecting the glyphosate mother liquor to concentration and triethylamine hydrochloride precipitation; removing the triethylamine hydrochloride precipitate to obtain a glyphosate mother liquor concentrate A; adding a pH adjusting agent to make the solution layered; extracting triethylamine and hydrochloride from a solution containing the triethylamine hydrochloride; converting the triethylamine hydrochloride into triethylamine; then treating a salt solution containing organophosphorusto obtain a corresponding dibasic biphosphate or an aqueous glyphosate solution. The process is scientific and reasonable, achieves high-efficiency recovery of triethylamine, can obtain a plurality of by-products without waste liquid and solid waste, greatly reduces the treatment cost for the glyphosate mother liquor, and has obvious economic and environmental benefits. The process solves the difficult problem that the glyphosate mother liquor cannot be completely treated, which hinders development of the glyphosate industry, and the process achieves comprehensive treatment of the glyphosatemother liquor and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the recovery and treatment of glyphosate mother liquor, in particular to a comprehensive treatment process for glyphosate mother liquor prepared by a glycine method. Background technique [0002] Glyphosate is a high-efficiency broad-spectrum herbicide that has a broad herbicidal spectrum, low toxicity and no residue. At present, glyphosate is usually prepared by the glycine method in China, that is, paraformaldehyde, glycine and dialkyl phosphite are used as raw materials, triethylamine is used as a catalyst, and glyphosate is obtained after addition, condensation, and acidolysis. This method is relatively simple, the yield is high, the cost is low, and the product quality is good, but because glyphosate has a certain solubility in water, a certain amount of glyphosate mother liquor will inevitably be produced, and the glyphosate mother liquor is an acidic liquid , contains a large amount of triethylamine hydrochloride, hydro...

Claims

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Application Information

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IPC IPC(8): A01N57/20A01P13/00C07C209/00C07C211/05C01B25/30C01B25/28
CPCA01N57/20C01B25/28C01B25/30C07C209/00C07C211/05
Inventor 刘德亮
Owner 刘德亮
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