Resource recycling method of glyphosate mother liquor

Abstract

The invention particularly relates to a resource recycling method of glyphosate mother liquor, which separates each component of mother liquor generated from producing glyphosate by a phosphorous acid dimethyl ester method by a multistage membrane separation technology, sufficiently recycles each useful component, reduces wastewater treatment capacity and realizes resource recycling. The method comprises the following steps: preparing the glyphosate mother liquor in glyphosate production by the phosphorous acid dimethyl ester method; removing solid impurities and viscous components by microfiltration, ultrafiltration and the like, and then continuously entering all stages of membrane separation devices for separating and concentrating; each stage of membrane separation device has different functions, wherein the first-stage membrane separation device separates and concentrates for obtaining a solution A being rich in mineral salt of sodium chloride or ammonia chloride and the like; the second-stage membrane separation device separates and concentrates for obtaining a solution B being rich in sodium hydroxide; the third-stage membrane separation device separates and concentrates for obtaining a solution C being rich in phosphorous acid; and the forth-stage membrane separation device separates and concentrates for obtaining a solution D being rich in glyphosate, and the rest is a solution E being rich in other impurities and byproducts.

Description

technical field [0001] In particular, the present invention relates to a method for separating various components of the mother liquor produced by the dimethyl phosphite method of glyphosate through multi-stage membrane separation technology, fully recycling useful components, reducing the amount of wastewater treatment, and realizing resource recycling The invention discloses a method for recovering and utilizing glyphosate mother liquor, which belongs to the field of mother liquor treatment process obtained from glyphosate production. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, low-residue, broad-spectrum and systemic non-selective herbicide. Because of its superior performance, it has developed into the largest herbicide variety in the world. The main synthesis methods of glyphosate include chloroacetic acid method, dimethyl phosphite method, iminodiacetic acid method and so on. Due to the characteristics of low cost, high yield and high ...

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of the above two methods: one is that other raw materials need to be added and steam is consumed; the other is that the processing cost is high

[0006] The applicant has the publication number CN101058586 and the title "Method for Concentrating and Separating Glyphosate in High Salt Glyphosate Mother Liquor Using Membrane Technology", but this method only separates sodium chloride and glyphosate, and the obtained glyphosate Phosphine water solution also contains a large amount of phosphorous acid, glycine and other by-products, not only the quality of the water solution is poor, but also causes the transfer of pollutants, and the resource utilization of glyphosate mother liquor has not been realized