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Method and apparatus for resourceful treatment of glyphosate mother liquor by bipolar membrane electrodialysis integrated nanofiltration and reverse osmosis technology

A bipolar membrane electrodialysis, glyphosate mother liquor technology, applied in the direction of electrodialysis, membrane technology, chemical instruments and methods, etc., can solve the problems of secondary pollution, value reduction, large wastewater discharge pressure of enterprises, etc. The effect of resource consumption, improvement of environmental pollution, significant economic and social benefits

Inactive Publication Date: 2014-07-30
ZHEJIANG CIRCLE TECH MEMBRANE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the treatment of alkaline mother liquor, the concentrated solution treated by electrodialysis method contains a certain amount of organic matter, and the discharge of this high-concentration saline wastewater will cause secondary pollution, and bring great wastewater discharge pressure to enterprises.
If the sodium chloride obtained by evaporation and concentration is used for production, its value will be reduced due to the presence of certain organic matter, and the energy consumption of the treatment process will be high.

Method used

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  • Method and apparatus for resourceful treatment of glyphosate mother liquor by bipolar membrane electrodialysis integrated nanofiltration and reverse osmosis technology
  • Method and apparatus for resourceful treatment of glyphosate mother liquor by bipolar membrane electrodialysis integrated nanofiltration and reverse osmosis technology
  • Method and apparatus for resourceful treatment of glyphosate mother liquor by bipolar membrane electrodialysis integrated nanofiltration and reverse osmosis technology

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Experimental program
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Effect test

Embodiment 1

[0024] The preparation of tetrapropyl ammonium hydroxide adopts bipolar membrane electrodialysis equipment to carry out, and described bipolar membrane electrodialysis equipment is made up of 2 bipolar membrane electrodialysis devices connected in series, and described bipolar membrane electrodialysis device is made up of two sides Electrolyte chamber, and the electrodialysis compartment sandwiched between the two sides of the electrodialysis chamber, such as figure 1 shown.

[0025] A bipolar membrane electrodialysis device with a two-compartment structure, the area of ​​each membrane is 200mm×400mm, a total of 20 pairs (that is, 20 groups of units composed of bipolar membranes and cation exchange membranes) bipolar membranes, cation exchange membranes The membrane stack is formed, and the bipolar membrane electrodialysis device is composed of anolyte chambers on both sides. An electrodialysis compartment is sandwiched between the anode compartment, the electrodialysis compa...

Embodiment 2

[0028] On the basis of Example 1, keeping other conditions constant, the performance of bipolar membrane electrodialysis recovery glyphosate mother liquor at different current densities is shown in Table 1.

[0029] Table 1 Performance data of recovery of glyphosate mother liquor by bipolar membrane electrodialysis under different current densities

[0030]

[0031]

Embodiment 3

[0033] On the basis of Example 1, add 0.05mol / L dilute hydrochloric acid to the acid chamber, add 0.05mol / L dilute sodium hydroxide to the alkali chamber, and when running to the end, respectively obtain hydrogen with a molar concentration of 2.05mol / L Sodium oxide solution and 1.8mol / L hydrochloric acid solution, the content of organic matter in the acid-base is about 0.06%. The mass content of chloride ions in the feed liquid is below 1%, the average current efficiency is 62%, the energy consumption is 2.8kwh / kg sodium hydroxide, and the recovery rate of glyphosate is 95.5%.

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Abstract

The invention discloses a method and apparatus for resourceful treatment of glyphosate and neutralization of mother liquor by integrated membrane electrodialysis integrated nanofiltration and reverse osmosis technology. The bipolar membrane electrodialysis technology is used for treating glyphosate and neutralizing mother liquor; sodium ions in the mother liquor enter into an alkali chamber through a cation exchange membrane, and combine with hydroxyl ions produce by the bipolar membrane to produce sodium hydroxide; and chloride ions enter into an acid chamber through an anion exchange membrane, and combine with the hydrogen ions generated by the bipolar membrane to form hydrochloric acid. When the conductance in the mother liquor is less than 10000, the desalinated mother liquor is subjected to desalination concentration and reverse osmosis concentration by the nanofiltration membrane, so as to recover glyphosate. The concentration of acid and alkali obtained by the invention is above 2 mol / L, the obtained hydrochloric acid can be used for hydrolysis of esterification reaction in a production process, sodium hydroxide can be used for recycling tri ethylamine, and the concentrated glyphosate has concentration more than 10%. The invention achieves glyphosate mother liquor cleaning technology with zero discharge and can be widely applied to treatment of the glyphosate mother liquor with high salt content.

Description

(1) Technical field [0001] The invention relates to a method for resourceful treatment of glyphosate neutralization mother liquor using bipolar membrane electrodialysis integrated nanofiltration and reverse osmosis technology. (2) Background technology [0002] Glyphosate is a widely used post-emergence herbicide, which is widely used in agricultural production. At present, the production of glyphosate mainly includes iminodiacetic acid method (IDA method) and dialkyl phosphite method. (DMP). The concentration of the glyphosate mother liquor produced by the IDA process is relatively low. The evaporation process of the traditional evaporation process dehydration to make the water solution consumes a lot of energy. At the same time, high temperature evaporation is likely to cause the decomposition of glyphosate molecules and reduce the product yield. CN1775786A discloses a method that can effectively concentrate mother liquor, reduce energy consumption and reduce pollution. ...

Claims

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Application Information

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IPC IPC(8): B01D61/58B01D61/44B01D61/46B01D61/02C01D1/04C01B7/01A01N57/20A01P13/00
CPCY02A20/124Y02A20/131
Inventor 沈江南黄杰李健王利祥
Owner ZHEJIANG CIRCLE TECH MEMBRANE TECH
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