Method for separating and purifying glufosinate-ammonium solution

A purification method, the technology of glufosinate-ammonium, applied in the field of separation and purification of glufosinate-ammonium solution, can solve the problems of difficult separation, high resin price, unsafety, etc., and achieve the effect of automatic control, good product quality and low processing cost

Active Publication Date: 2011-07-20
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 (Ba

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] Using phosphorus trichloride or phosphite as the starting material, at the end of the ammoniation reaction, a glufosinate-ammonium solution is obtained. The mass fraction of glufosinate-ammonium is 20%, the mass fraction of sodium chloride is 8%, and the pH of the solution is 4. . Add 1 times of water for dilution, and enter the first-stage nanofiltration membrane separation device. The selected nanofiltration membrane is a roll-type nanofiltration membrane with a molecular weight cut-off of 150Da and a glufosinate rejection rate of ≥90%. The control pressure is 1.0MPa and the temperature is 10 ℃ to obtain solution A with the mass fraction of glufosinate-ammonium and 0.5% of sodium chloride and solution B with the mass fraction of glufosinate-ammonium and 3% of sodium chloride;

[0023] Solution A enters the electrodialysis membrane separation device for separation. The selected electrodialysis membrane is a homogeneous membrane with a rejection rate...

Example Embodiment

[0026] Example 2

[0027] Using phosphorus trichloride or phosphite as the starting material, at the end of the ammoniation reaction, a glufosinate-ammonium solution is obtained, the mass fraction of glufosinate-ammonium is 35%, the mass fraction of ammonium chloride is 20%, and the solution pH=7 , add 5 times of water for dilution, and enter the 4-stage nanofiltration membrane separation device. The selected nanofiltration membrane is a roll-type nanofiltration membrane with a molecular weight cut-off of 300 Da and a glufosinate rejection rate of ≥90%. The control pressure is 4.0 MPa and the temperature is At 45°C, a solution A with a mass fraction of glufosinate-ammonium and 4% of ammonium chloride and a solution B with a mass fraction of 0.1% of glufosinate and 8% of ammonium chloride were obtained;

[0028] Solution A enters the electrodialysis membrane separation device for separation. The selected electrodialysis membrane is a heterogeneous membrane with a rejection rate...

Example Embodiment

[0031] Example 3

[0032] Using phosphorus trichloride or phosphite as the starting material, at the end of the ammoniation reaction, a glufosinate-ammonium solution is obtained, the mass fraction of glufosinate-ammonium is 35%, the mass fraction of ammonium chloride is 15%, and the solution pH=6 , add 3 times of water for dilution, and enter the 3-stage nanofiltration membrane separation device. The selected nanofiltration membrane is a roll-type nanofiltration membrane with a molecular weight cut-off of 200 Da and a glufosinate rejection rate of ≥90%. The control pressure is 3.0 MPa and the temperature is At 35°C, solution A with glufosinate-ammonium mass fraction of 20% and ammonium chloride mass fraction of 2% and solution B with glufosinate-ammonium mass fraction of 0.08% and ammonium chloride mass fraction of 6% were obtained;

[0033] Solution A enters the electrodialysis membrane separation device for separation. The selected electrodialysis membrane is a heterogeneous...

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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 ...

Claims

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Application Information

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IPC IPC(8): C07F9/30
Inventor 赵经纬丁国良邱晖
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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