Process for treating glyphosate mother liquid

Abstract

The present invention relates to the process of treating glyphosate mother liquor from glycine synthesis process. The treating process includes the following successive steps: 1) introducing ammonia into glyphosate mother liquor to regulate pH to 7-10, letting stand and recovering triethylamine from the upper layer; and 2) decompression distilling lower layer of the mother liquor, cooling, filtering to eliminate ammonium chloride crystal and to obtain concentrated ammonium glyphosate liquid. The said treating process has low production cost, low power consumption and environment friendship, and can obtain concentrated liquid with raised effect. Furthermore, glyphosate may be separated from the mother liquor to raise total glyphosate yield.

Description

(1) Technical field [0001] The invention relates to a process for treating mother liquor obtained from glyphosate, in particular to a process for treating mother liquor obtained by synthesizing glyphosate with a glycine method. (2) Background technology [0002] Glyphosate, as an efficient, broad-spectrum, low-toxic and safe organic phosphine post-emergence herbicide, is very effective in the control of perennial deep-rooted weeds and is widely used in agriculture, forestry, animal husbandry, and horticulture. [0003] There are many preparation methods of glyphosate, generally obtained by glycine method or bisglyphosate oxidation method. Glyphosate is usually prepared by the glycine method in China. The method has the advantages of low cost of raw materials, high yield of raw powder, high product purity, etc., but there are many problems in the prior art, such as high energy consumption, high requirements for equipment, and production of glyphosate by the glycine method. ...

AI Technical Summary

Problems solved by technology

The total amount of mother liquor after treatment exists in this process increases (adding 30% sodium hydroxide solution contains a large amount of water), increases the energy consumption when concentrating, and uses this kind of 10% sodium glyphosate containing more sodium chloride After brine agent, the sodium chloride content in the soil is too high, which will easily cause poor soil dispersion, sticky soil, and become sodium-alkaline soil, which will cause damage to crops, and eventually lead to crop yield and quality decline

In addition, the herbicidal efficacy (quick action and thoroughness) of 10% glyphosate sodium salt solution is slightly inferior to that of other glyphosate preparations