Process for treating sulfate-containing glyphosate mother solution based on membrane method

Abstract

The invention discloses a process for treating a sulfate-containing glyphosate mother solution based on a membrane method, relates to the process for treating the sulfate-containing glyphosate mother solution based on the membrane method, and particularly relates to the process for concentration of the sulfate-containing glyphosate mother solution for crystallization powder discharge and wastewater comprehensive treatment based on the membrane method. Provided is the glyphosate mother solution treating process improving the powder purity and having less energy consumption and low production cost. The glyphosate mother solution is concentrated through a membrane separation system to obtain a concentrated solution containing a glyphosate crystallization powder and a thin liquid containing sulfate and formaldehyde; the concentrated solution enters a next procedure for powder taking, a filtrate after powder taking is added with water, then enters a filtrate membrane separation system and is concentrated, and the operation can be recurrently carried out in such a way; the permeate liquid (the thin liquid) enters a permeate liquid membrane separation system and is concentrated, and a sulfate thick liquid containing formaldehyde and clear water are obtained; the sulfate thick liquid containing formaldehyde is de-evaporated to obtain sulfate crystals and condensate water containing formaldehyde; a chemical agent is added into the condensate water and undergoes a reaction with formaldehyde to generate by-products, and clean water is obtained after the by-products are removed; and the clean water can be used as addition water for concentration and dialysis of the membrane separation system.

Description

technical field [0001] The invention relates to a process for treating sulfate-containing glyphosate mother liquor (mother liquor after crystallization and separation of glyphosate original drug) based on a membrane method, in particular to a membrane method (membrane separation technology method) for concentrating sulfate-containing grass The process of crystallization and powder extraction of glyphosate mother liquor and comprehensive treatment of waste water. Background technique [0002] The existing treatment process for the concentration of sulfate-containing glyphosate mother liquor is: use a multi-effect evaporator to concentrate and crystallize to produce powder. [0003] There are following main problems in this existing concentration process: [0004] 1. It is necessary to adjust the pH value of the mother liquor and introduce impurities. 2. Glyphosate and impurities are concentrated and crystallized into powder, and the purity of glyphosate powder is reduced. ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the powder purity, low energy consumption and low production cost in view of the problems of reducing the powder purity, high energy consumption and high production cost in the existing sulfate-containing glyphosate mother liquor concentration process. The process of treating sulfate-containing glyphosate mother liquor based on membrane method