Process of treating glyphosate producing effluent

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...

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