Method for separating and purifying glufosinate-ammonium solution

Abstract

The invention discloses a method for separating and purifying glufosinate-ammonium solution. The method comprises the steps of: adding 1-5 times of water into the glufosinate-ammonium solution for dilution, carrying out the combined technique of nanofiltration membrane separation and electroosmosis membrane separation to obtain solution C containing 15-30% glufosinate-ammonium and 0.05-0.5% inorganic salt and solution F containing 0.01-0.1% glufosinate-ammonium and 3-7% inorganic salt, wherein the solution C is used for preparing high-purity glufosinate-ammonium, and the solution F is used for extracting the inorganic salt. The method for separating and purifying the glufosinate-ammonium solution has the advantages of being simple in operation, low in treatment cost, low in energy consumption, high in yield of the glufosinate-ammonium, good in product quality and capable of realizing automatic control.

Description

technical field [0001] The invention relates to the field of glufosinate-ammonium production, in particular to a method for separating and purifying a glufosinate-ammonium solution. Background technique [0002] Glufosinate-ammonium (glufosinate-ammonium or glufosinate) is a highly efficient, low-toxic, non-selective (killing) contact organophosphorus herbicide with partial systemic action. It was first developed by the German Hoechst company, and its trade name is Basta. The chemical formula is C 5 h 12 NO 4 P , with a formula weight of 181.127, is easily soluble in water but not easily soluble in organic solvents. Glufosinate-ammonium has low toxicity, relatively safe, easy to degrade in soil, safe for crops, small drift, wide herbicidal spectrum, high activity, less dosage, and less environmental pressure. In recent years, people pay more and more attention to glufosinate-ammonium. The production techniques mainly include biological method and chemical method, among ...

AI Technical Summary

Problems solved by technology

In the process of chemical synthesis, along with the generation of inorganic salts, because the solubility of inorganic salts and glufosinate-ammonium in water is very large, it is difficult to separate them by conventional methods. Generally, methanol or ethanol is added, and glufosinate-ammonium and ammonium chloride are used in Different solubility in alcohol for separation, but this method needs to consume solvent, which increases the cost and also brings unsafe factors

In June 2007, the article "Ion Exchange Lipid Purification Technology of Glufosinate-ammonium (Basta)" published in Volume 30, Issue 6 of "Hebei Chemical Industry" mentioned that the ion-exchange resin method was used to separate the inorganic salts in the glufosinate-ammonium solution. Very high purity can be achieved, but the resin used in this method is expensive, the operation is complicated, the yield is below 80%, and the loss of glufosinate-ammonium is serious

Since the inorganic salts produced during the synthesis of glufosinate-ammonium do not have a good technology for separation, it is difficult to promote the industrial production of glufosinate-ammonium