Method for recycling glyphosate mother solution

Abstract

The invention discloses a method for recycling glyphosate mother solution, and belongs to the technical field of chemical engineering. The method comprises the following steps: producing glyphosate and glyphosate mother solution by a glycine method or an iminodiacetic acid method; concentrating the glyphosate mother solution; carrying out an oxidization treatment on the glyphosate mother solution concentrate; cooling and crystallizing the glyphosate mother solution oxidation solution, taking out the crystallized glyphosate mother solution oxidation solution and concentrating; concentrating the permeate to obtain a sodium chloride product, and reusing the distillate; adjusting the pH value of the concentrate to 3-4, and then carrying out a photocatalytic oxidation reaction; adjusting the pH value to obtain a disodium hydrogen phosphate product or a trisodium phosphate product. According to the method disclosed by the invention, the concentration treatment is carried out before the glyphosate mother solution is oxidized, thus reducing the content of chloride ions in the glyphosate mother solution, increasing the concentration of the reactant, and increasing the efficiency of the subsequent oxidization reaction; hydrogen peroxide photocatalytic oxidation is carried out on the concentrate, the reaction is thorough, the oxidability is better, the substances difficult to oxidize by oxygen-enriched wet oxidization can be oxidized, and the reaction conditions are moderate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recycling glyphosate mother liquor. Background technique [0002] Due to its low toxicity, high efficiency, low residue, and broad-spectrum, glyphosate is the world's largest sales and fastest-growing pesticide variety, and it is accompanied by the successful development and popularization of glyphosate-based transgenic crops and energy shortages. The sowing and promotion of biofuel crops provides new opportunities for the production of glyphosate. [0003] There are two main synthetic methods for glyphosate production. One is the iminodiacetic acid method, which uses diethanolamine or hydrocyanic acid as the starting material. This method is commonly used by foreign companies such as Monsanto in the United States; the other is the alkyl ester method. , most domestic enterprises adopt this method. The main raw materials for the production of g...

AI Technical Summary

Problems solved by technology

Treatment methods such as the patented CN 103012474A electrocatalytic oxidation process are relatively complicated; CN101402652A only reduces the sodium chloride content in the mother liquor, and does not carry out effective resource recovery; CN103864040A performs air oxidation, which has low efficiency and low secondary oxidation efficiency. The rate is poor, because the heat of reaction is greater than the activation energy required for the reaction, energy accumulation occurs, and a noble metal catalyst is required