Glyphosate synthesized mother liquor processing method

A technology for glyphosate mother liquor and synthesis mother liquor, which can be applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. The effect of lower energy consumption and lower treatment costs

Active Publication Date: 2009-01-21
JIANGSU YANGNONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current production process, mother liquor is treated as wastewater, which not only wastes resources, but also pollutes the environment.
The mother liquor contains 0.3-3% glyphosate, 0.3-3% formaldehyde, and 0.3-3% formic acid. If it cannot be directly treated by biochemical treatment, formaldehyde and glyphosate can inhibit bacteria. The original treatment process has passed Dehydration and concentration, the concentrated solution is sold with 10% water agent, and the extracted water is diluted before biochemical treatment. The investment in treatment equipment is large, the operating cost is high, and a large amount of steam is consumed. It is difficult to meet the national emission standards after biochemical treatment. At the same time, recovery and concentration The sales of liquid water distribution agents have caused secondary pollution, which has attracted great attention from the industry and national authorities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The temperature of the glyphosate mother liquor containing 0.5% glyphosate, 0.9% formaldehyde and 1.1% formic acid is controlled at 15-45°C, the pH is controlled at 1-11, and the solid components and colloids are removed by filtration to achieve After the inlet water requirements of the nanofiltration equipment, it is separated into two strands by the first-stage nanofiltration membrane. The glyphosate content of the concentrated side reaches 8% to recover glyphosate for the production of glyphosate raw powder; The nanofiltration membrane is divided into two strands, the solution on the thicker side returns to the first-stage nanofiltration membrane, and the remaining light side is an aqueous solution containing formic acid, formaldehyde and trace glyphosate, of which glyphosate content is 0.05%, formaldehyde content is 0.8%, The formic acid content was 1.0%.

Embodiment 2

[0027] Add 1.5% by weight of 27.5% hydrogen peroxide and 0.5 g of ferrous chloride to the weak liquid obtained in Example 1, heat up to 90° C. for heat preservation, cool down and filter after the heat preservation for 1 hr, and cool down the clear liquid to obtain the weak liquid after oxidation, in which formic acid The content is 2.20%, and the formaldehyde content is 0.15%.

[0028] Add 30% sodium hydroxide to the oxidized weak liquid to neutralize it until pH = 7, keep it warm at 40°C for 8 hours and filter to remove the solid components and colloids of the oxidized weak liquid. The content of sodium formate in the concentrated solution is 8%, and the sodium formate is recovered by cooling and crystallizing. The content of formic acid in the final thin solution is 0.08%, and the content of formaldehyde is 0.15%.

Embodiment 3

[0030] Add 1.5% ammonia gas by weight to the weak liquid obtained in Example 1, cool and filter to remove the solid components and colloids in the weak liquid after being incubated at 25°C for 1hr, and the light liquid enters the reverse osmosis membrane to concentrate after the treatment, and the concentrated liquid The content of urotropine is 6%, and the urotropine is recovered. The content of formic acid in the final thin solution is 0.08%, and the content of formaldehyde is 0.2%.

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Abstract

The invention relates to a comprehensive treatment process for mother liquor obtained in glyphosate synthesis by IDA route air oxidation method. Water treated by the process can meet the requirements of glyphosate synthesis, and the treatment process comprises the following steps that membrane treatment is adopted to remove the glyphosate and homolog thereof in the mother liquor; and heavy liquor is used to reclaim the glyphosate, while thin liquor is used to manufacture glyphosate after the formic acid and formaldehyde in the thin liquor are removed. The method can moderately remove the glyphosate and homolog thereof, the formic acid and the formaldehyde in glyphosate mother liquor, and has low treatment cost; moreover, the method does not generate secondary pollution, and can realize the recovery of glyphosate; meanwhile, treated water can be reused for manufacturing glyphosate, thereby realizing zero discharge of waste water during synthesizing glyphosate.

Description

technical field [0001] The invention relates to a method for treating pesticide mother liquor, in particular to a comprehensive treatment method for glyphosate synthesis mother liquor. Background technique [0002] Glyphosate is a widely used organic phosphine herbicide, which has the characteristics of high efficiency, broad spectrum, low toxicity and safety, and is very effective in the control of perennial deep-rooted weeds. As a high-efficiency, low-toxicity, and destructive herbicide, glyphosate has been used for more than 25 years. In recent years, due to the large-scale promotion of glyphosate-resistant transgenic crops, making its application more convenient, the market demand for glyphosate has grown rapidly, and it has continuously replaced other types of herbicides. It has occupied the first place in the world's pesticide sales for many years. In 2007, the global glyphosate consumption reached about 500,000 tons. It is estimated that the global demand for glyphos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/58
Inventor 何红军熊苏义姜友法孔勇王宝林
Owner JIANGSU YANGNONG CHEM
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