Glyphosate Mother Liquor Oxygen-enriched Wet Oxidation Heat Recovery and Advanced Treatment Method

Abstract

The invention discloses a method for recycling and deeply treating heat of oxygen-rich wet oxidation heat of glyphosate mother liquor, and belongs to the technical field of chemical engineering. The method comprises the following process steps: producing by using a glycine method and an iminodiacetic acid method so as to obtain glyphosate and glyphosate mother liquor; concentrating the glyphosate mother liquor; mixing the concentrated glyphosate mother liquor, compressed air and liquid oxygen, sequentially feeding into a first-stage preheater, a second-stage preheater, a first-stage reactor, a waste heat boiler and a second-stage reactor for treatment, sequentially feeding back an oxidized liquid obtained from the second-stage reactor to the waste heat boiler, the second-stage preheater and the first-stage preheater for heat exchange, cooling to crystallize the oxidized liquid after heat exchange so as to obtain a phosphate product, and concentrating the crystallized oxidized liquid so as to obtain a concentrated liquid and a penetrate liquid; concentrating the penetrate liquid so as to obtain a sodium chloride product, and recycling the distillated liquid as a recycled liquid to be used in a glyphosate production process; performing hydrogen peroxide photo-catalytic oxidation reaction on the concentrated liquid. By adopting the method, the production cost is lowered, and the reaction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recycling and advanced treatment of glyphosate mother liquid oxygen-enriched wet oxidation heat. 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...

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