Method for treating glyphosate mother liquor by oxidation method

Abstract

The invention provides a method for treating glyphosate mother liquor by an oxidation method, which comprises the following steps: firstly, using regulating agents for regulating the pH value of the glyphosate mother liquor with organic phosphor or glyphosate or nitrogenous compounds or salt to 0.1 to 14; then, carrying out the pressurized oxidation reaction with strong oxidizing gas under the condition of the existence of catalysts; oxidizing phosphorus-containing impurities such as glyphosate, glyphosine, orthophosphorous acid, methyl glyphosate, aminomethyl phosphonic acid, N-(Phosphonomethyl) iminodiacetic acid and the like into phosphate radical ions; oxidizing nitrogenous organic impurities such as glycin, triethylene ammonia, diethanolameine, aminomethyl phosphonic acid, hydroxyethyl glycine and the like into ammonia radical ions; and then, carrying out concentration and separation to obtain phosphate and amine salt inorganic compounds for recovery and reuse. The invention can effectively oxidize the complicated organic phosphor and the nitrogenous compounds in the glyphosate mother liquor into single phosphate radicals and amine salt inorganic compounds for convenient recovery and reuse, and can simultaneously reduce the environment pollution and the soil hardening caused by the mother liquor. Thereby, the total conversion rate of the phosphorus-containing compounds reaches 60 to 90 percent, the conversion rate of the nitrogenous compounds reaches more than 90 percent, in addition, the removal rate of the glyphosate reaches 95 to 99 percent, a large amount of produced phosphate and amine salt can be used for agricultural fertilizers, and the goal of changing waste materials into valuable materials is achieved.

Description

technical field [0001] The invention relates to a method for treating waste mother liquor produced in the glyphosate production process. Background technique [0002] Glyphosate is a low-toxicity, high-efficiency, broad-spectrum herbicide. It was first successfully developed by Monsanto Company of the United States in 1974 and has applied for patent protection in many countries around the world. In the mid-to-late 1990s, with the successive expiration of its patent protection in various countries in the world and the widespread planting of glyphosate-resistant transgenic crops, the application of glyphosate has developed rapidly, becoming the largest and fastest-growing pesticide variety. [0003] There are many synthetic methods of glyphosate, but there are only two industrialized process routes, namely the IDA process and the alkyl ester process. These two technological routes all can produce a large amount of waste mother liquors, wherein the composition of the mother li...

AI Technical Summary

Problems solved by technology

At present, the mother liquor produced by these two processes is treated by preparing 10% glyphosate water solution. This treatment method removes a large amount of phosphorus-containing, nitrogen-containing and salt-containing organic impurities produced in glyphosate production. Into the soil during use, causing serious environmental pollution and soil compaction

Although there are many studies on the treatment of glyphosate mother liquor at home and abroad, and many patents have been applied for, they are all about how to recycle and separate triethylamine and...