Method for treating glyphosate mother solution by using oxidization method

Abstract

The invention relates to a method for treating a glyphosate mother solution by using an oxidization method, comprising the following steps of: regulating the PH value of the glyphosate mother solution containing organophosphorus or glyphosate or the glyphosate mother solution containing nitrogen-containing compounds or salts to 0.1-14, slowly dropwise adding hydrogen peroxide, raising temperature and then introducing strong-oxidization gas, wherein the reaction temperature is 0-100 DEG C, and the molar ratio of the added hydrogen peroxide to the strong-oxidization gas is 1:0.1-20; and carrying out oxidization reaction at normal pressure or under the condition of pressurization, oxidizing nitrogen-containing impurities, such as glyphosate, glyphosine, phosphorous acid, methyl glyphosate, aminomethyl phosphoric acid, N-(phosphonomethyl) iminodiacetic acid and the like, into phosphate radical irons, oxidizing nitrogen-containing organic impurities, such as glycine, triethyl ammonia, diethanol amine, aminomethyl phosphoric acid, ethoxyl glycine and the like, into ammonium radical ions, and then concentrating and separating to obtain a phosphate and amine salt inorganic compound for recycling. The invention can effectively oxidize the complex organophosphorus and the nitrogen-containing compounds in the glyphosate mother solution into a single phosphate radical and amine salt inorganic compound for convenient separation and recycling and simultaneously reduces the environmental pollution and the soil hardening of the mother solution; the total conversion rate of phosphorus-containing compounds reaches 60%-90%, the conversion rate of the nitrogen-containing compounds reaches above 90%, and the removing rate of the glyphosate reaches 95%-99% so that a great deal of generated phosphate and amine salt can be used for agricultural fertilizers, thereby achieving the purpose of turning wastes into valuable.

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 salt, or reduce the cost of concentration, such as Chinese patents 200610154907.9, 00710070249.x, 200410099086.4, 200510049296.7、200710016495.7、200710016496.1都是对三乙胺或盐的回收进行的研究;专利200510061711.0、200610050243.1、200610050151.3、200710066935.x、200710067967.1都是关于膜分离浓缩母液的研究;专利200410089140.7是关于双甘膦氧化后 The research on directly preparing water preparation without separating the mother liquor has not fundamentally solved the problem of harmful impurities in the mother liquor, and the prepared 10% water preparation will still cause serious environmental pollution and soil compaction