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Process of treating glyphosate producing effluent

A treatment method and technology for producing wastewater, which can be used in natural water treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc. Economic and environmental benefits, good effect

Active Publication Date: 2007-12-19
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most glyphosate production enterprises in my country use glycine, paraformaldehyde, and dimethyl phosphite as raw materials to obtain glyphosate products with a content of 95% through synthesis, hydrolysis, crystallization, and filtration. The mother liquor is neutralized by liquid alkali to recover the catalyst. The remaining wastewater has a high COD concentration and contains a certain amount of effective glyphosate components, so it is difficult to treat the wastewater

Method used

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  • Process of treating glyphosate producing effluent

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Effect test

Embodiment 1

[0014] Embodiment 1: get the glyphosate production waste water 100ml waste water (through detection glyphosate content 1.25%, COD value 41695mg / L) after adding alkali and recovering catalyst, add 22 grams of calcium oxide, stir reaction 24 hours, filter, The filter cake is dissolved with hydrochloric acid, and the glyphosate solution is recovered. The glyphosate content of the filtrate was detected to be 0.031%, and the COD value was 2138mg / L.

Embodiment 2

[0015] Embodiment 2: get the glyphosate production waste water 100ml waste water (through detection glyphosate content 1.32%, COD value 43672mg / L) after adding alkali neutralization and recovery catalyst, add 40 grams of magnesium oxide, stir reaction 12 hours, filter, The filter cake is dissolved with sulfuric acid, and the glyphosate solution is recovered. The glyphosate content of the filtrate was detected to be 0.032%, and the COD value was 2242mg / L.

Embodiment 3

[0016] Embodiment 3: get the glyphosate production waste water 100ml waste water (through detection glyphosate content 1.29%, COD value 42632mg / L) after adding alkali and recovering catalyst, add 40ml concentration and be 55% calcium chloride solution, stir React for 20 hours, filter, dissolve the filter cake with nitric acid, and recover the glyphosate solution. The glyphosate content of the filtrate was detected to be 0.029%, and the COD value was 2182mg / L.

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Abstract

The present invention discloses new process of treating glyphosate producing effluent. During glyphosate producing process, certain amount of calcium salt, magnesium salt, calcium salt solution or magnesium salt solution is added into the waste water after filtering, alkali neutralizing and recovering catalyst for full reaction; the resultant is filtered to obtain filter cake containing calcium or magnesium salt of glyphosate; and the filter cake is treated with inorganic acid to obtain glyphosate solution. The process has glyphosate recovering rate up to 95 %, COD eliminating rate up to 95 % and utilization of waste glyphosate water.

Description

(1) Technical field [0001] The invention relates to a treatment method for glyphosate production wastewater. (2) Background technology [0002] The chemical name of glyphosate is N-phosphonomethylglycine (PMG), and its molecular formula is: [0003] [0004] It is a high-efficiency, low-toxicity, broad-spectrum, and safe herbicide. It has good systemic and conductive properties, and is currently the largest herbicide production variety. Most glyphosate production enterprises in my country use glycine, paraformaldehyde, and dimethyl phosphite as raw materials to obtain glyphosate products with a content of 95% through synthesis, hydrolysis, crystallization, and filtration. The mother liquor is neutralized by liquid alkali to recover the catalyst. The remaining wastewater has a high COD concentration and contains a certain amount of effective glyphosate components, so it is difficult to treat the wastewater. (3) Contents of the invention [0005] The purpose of the prese...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F103/36
Inventor 孙国庆刘强林宝昌邹宗加牛月利
Owner SHANDONG WEIFANG RAINBOW CHEM
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