Treatment process for glyphosate mother liquid

Abstract

The invention discloses a treatment process of glyphosate mother solution. The glyphosate mother solution is the remaining mother solution obtained after separating glyphosate bulk drug from a system when an acidolysis reaction is over during a process of producing the glyphosate bulk drug by a dialkyl phosphate method. The treatment process of the glyphosate mother solution comprises the following steps: containing the glyphosate mother solution in a concentration device; separating to eliminate most of water under a depressurization condition to separate the glyphosate bulk drug dissolved in the mother solution; standing for layering, wherein, an upper layer is triethylamine hydrochloride and a lower layer is aqueous solution containing the glyphosate; combining the solution of the lower layer with the glyphosate for the concentration treatment process of next batch; neutralizing the triethylamine hydrochloride of the upper layer with alkali to adjust pH value to 8-13; rectifying the triethylamine of the upper layer and returning to a glyphosate synthesis procedure for recycle. The solution of the lower layer is distilled to recover a small amount of the triethylamine hydrochloride, and then discharged after biochemical treatment or used for preparing 10% glyphosate solution. The treatment process is suitable for treatment of the glyphosate mother solution.

Description

technical field [0001] The invention relates to a treatment process of glyphosate mother liquor. Background technique [0002] With the development of agricultural production, the application of glyphosate is quite common. As a high-efficiency and low-toxic herbicide, it is currently the most used pesticide variety. In the production process of glyphosate mother liquor, it is generally produced by the dialkyl phosphite method. After the acid hydrolysis process is completed and the glyphosate crystals are separated, the current treatment process for the glyphosate mother liquor in the factory is Use alkali to neutralize to a pH value of 10-12, statically separate layers, recover triethylamine hydrochloride in the upper layer, and distill and concentrate the mother liquor in the lower layer to prepare a 10% glyphosate salt dosage form. This process will bring 3-5 tons of 10% glyphosate water solution for every ton of glyphosate technical product produced, and a large amount o...

AI Technical Summary

Problems solved by technology

This process will bring 3-5 tons of 10% glyphosate water solution for every ton of glyphosate technical product produced, and a large amount of sodium chloride will be precipitated during the neutralization and concentration process, and the 10% glyphosate water solution will be due to If the salt content is too high, it will have negative impacts such as hardening of the land after use. With the restriction of the use of 10% glyphosate water in the country, the existing grass Glyphosate mother liquor treatment process will not meet environmental protection requirements, while reducing the yield of glyphosate technical