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IDA method glyphosate wastewater resource treatment method

A technology of glyphosate wastewater and treatment method, which is applied in water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve the problems of inability to treat and recycle glyphosate, speed up the reaction speed and high reaction temperature, and achieve The effect of avoiding waste, strong continuity and large processing power

Active Publication Date: 2015-05-06
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature of this process is relatively high, which is 160-250 ° C, and more steam is required for heating; in addition, this process needs to add divalent or ferric ions to the wastewater in order to speed up the reaction, and the iron ions will eventually stay in the solution , so that the final wastewater still needs to be treated again
[0003] Although the above-mentioned patented treatment method has treated glyphosate wastewater, it cannot completely treat and recycle glyphosate, formic acid and formaldehyde in the wastewater, and new waste will inevitably appear after treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Wastewater resource treatment method of the present invention is as follows:

[0031] 1. Take 300L of waste water produced by IDA glyphosate, and pass the waste water through a conventional reverse osmosis membrane to separate glyphosate. The molecular weight cut-off of the reverse osmosis membrane is 100 Daltons. The temperature is 24°C, and the material is discharged when the operating pressure reaches 3.8MPa. After treatment, glyphosate concentrated liquid and formaldehyde thin liquid were obtained. The glyphosate content in the glyphosate concentrated liquid was 9.93%, and the glyphosate content in the formaldehyde thin liquid was 0.14%.

[0032] 2. Take 23.64kg of the obtained glyphosate concentrate, filter and recycle the glyphosate crystals to obtain 1.61kg of glyphosate technical material with a purity of 82%; the remaining filtrate is 20.81kg with a glyphosate content of 5.66%. The filtrate can be directly used to prepare glyphosate water, or can adopt the fol...

Embodiment 2

[0036] 1. Take 246.70kg of wastewater produced by IDA glyphosate, and pass the wastewater through a conventional reverse osmosis membrane to separate glyphosate. The steps and conditions for the wastewater to pass through the reverse osmosis membrane are as follows: the molecular weight cut-off of the reverse osmosis membrane is 100 Daltons, and the flow rate is 100L / h, the temperature is 24°C, and the material is discharged when the operating pressure reaches 3.8MPa. After treatment, glyphosate concentrated liquid and formaldehyde thin liquid were obtained. The glyphosate content in the glyphosate concentrated liquid was 9.62%, and the glyphosate content in the formaldehyde thin liquid was 0.16%.

[0037] 2. Take 20.43 kg of glyphosate concentrate, filter and recover the glyphosate crystals in it, and obtain 1.49 kg of glyphosate technical substance with a purity of 80.84%; the remaining filtrate is 17.14 kg, and the glyphosate content is 4.60%. Use caustic soda to adjust th...

Embodiment 3

[0041] 1. Take 275.14kg of wastewater produced by IDA glyphosate, and pass the wastewater through a conventional reverse osmosis membrane to separate glyphosate. The steps and conditions for the wastewater to pass through the reverse osmosis membrane are: the molecular weight cut-off of the reverse osmosis membrane is 100 Daltons, and the flow rate is 80L / h, the temperature is 40°C, and the material is discharged when the operating pressure reaches 3.8MPa. After treatment, glyphosate concentrated liquid and formaldehyde thin liquid are obtained. The glyphosate content in the glyphosate concentrated liquid is 11.89%, and the glyphosate content in the formaldehyde thin liquid is 0.16%.

[0042] 2. Get 23.64kg of glyphosate concentrate, filter and reclaim the glyphosate crystals therein to obtain 1.61kg of glyphosate former drug, with a purity of 82.00%; the filtrate is 20.81kg, and the glyphosate content is 5.56%. Adjust the pH of the filtrate to 9.3 with caustic soda, then spr...

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Abstract

The present invention discloses an IDA method glyphosate wastewater resource treatment method, which comprises: making glyphosate wastewater obtained through the IDA method pass through a reverse osmosis membrane, separating the glyphosate to obtain a glyphosate concentrated liquid and a formaldehyde light liquid, filtering the concentrated liquid, recovering the glyphosate, adjusting the pH value of the remaining filtrate and burning to obtain a pyrophosphate, adopting an oxidation method to oxidize the formaldehyde in the light liquid into formic acid in a directed manner, concentrating the formic acid in the light liquid, and reacting to produce formate. According to the present invention, the glyphosate, the formaldehyde and the formic acid in the glyphosate wastewater are effectively treated and recovered, the treated wastewater can be completely used for production so as to achieve zero emission, and the recovered glyphosate, the recovered pyrophosphate and the recovered formate can be directly sold so as to provide a certain benefit, retrieve the investment and the operation cost, and provide great environmental protection and economic values.

Description

technical field [0001] The invention relates to a method for recycling IDA glyphosate wastewater. Background technique [0002] The IDA (iminodiacetic acid) method is one of the main methods for producing glyphosate. During the synthesis process, the difference in catalyst, separation method and process ratio will produce a large amount of waste water, which mainly contains glyphosate and formaldehyde. , formic acid and other components, wherein the content of glyphosate is about 1wt%, the content of formaldehyde is about 2.5et%, and the content of formic acid is about 1wt%. Nowadays, there are many reports on the treatment method of glyphosate wastewater, for example: patent CN101088934A discloses a treatment method of glyphosate wastewater, that is, by adding a certain amount of calcium salt and magnesium salt to the wastewater, and filtering to obtain The filter cake of glyphosate calcium (magnesium) salt can be treated with inorganic acid to obtain glyphosate solution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07F9/38C07C51/487C07C53/06C02F103/36
CPCC02F1/003C02F1/441C02F1/66C02F1/72C02F9/00C02F2101/306C02F2101/34C02F2101/38C02F2103/343C02F2103/36C02F2301/00
Inventor 孙国庆侯永生李志清李盼盼单志松凌晓光王进步许崇胜宁艳霞庞立飞葛宗昌夏振凤韩川
Owner SHANDONG WEIFANG RAINBOW CHEM
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