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Method for synchronously reclaiming orthophosphorous acid and glyphosate in glyphosate production wastewater by chemical precipitation method

A chemical precipitation method, a technology for producing wastewater, applied in the field of chemical technology, can solve problems such as difficult recycling and treatment, large volume of wastewater, and high concentration of pollutants

Inactive Publication Date: 2009-10-28
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The amount of waste water produced by this synthesis route is large, the concentration of pollutants is high, and it is difficult to recycle and treat
For this reason, scientific research institutions, colleges and universities, enterprises and institutions at home and abroad have conducted long-term research. So far, there is no effective, economical and reasonable method to deal with the wastewater produced by the glycine route to glyphosate.

Method used

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  • Method for synchronously reclaiming orthophosphorous acid and glyphosate in glyphosate production wastewater by chemical precipitation method
  • Method for synchronously reclaiming orthophosphorous acid and glyphosate in glyphosate production wastewater by chemical precipitation method
  • Method for synchronously reclaiming orthophosphorous acid and glyphosate in glyphosate production wastewater by chemical precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, chemical precipitation method reclaims the method for phosphorous acid and glyphosate in glyphosate production waste water simultaneously, with reference to figure 1 , the pH value of glyphosate production wastewater was adjusted to 10.5. Ca 2+ Treatment (by adding CaCl 2 The concentration of solution is 634g / L and add-on is the calcium salt filter cake that obtains after 22ml / 100ml former waste water), adds Na 2 CO 3 The reaction separates out CaCO 3 precipitation, when the added Na 2 CO 3 The amount is glyphosate and Na in calcium salt filter cake 2 CO 3 When the molar ratio is 0.06~0.075, the recovery rate of glyphosate is greater than 90%, and when the molar ratio is 0.075, the recovery rate of glyphosate is 93.08%; when the reaction time is more than 4h, the recovery rate of glyphosate reaches 93%. % or more, wherein when the reaction time was 17h, the recovery rate was 94.3%.

[0047] Separation of CaCO 3 The final filter cake is concentrat...

Embodiment 2

[0050] Embodiment 2 is basically the same as Embodiment 1, but has the following changes: in the (3) step, the glyphosate and Na 2 CO 3 The molar ratio is 0.16.

Embodiment 3

[0051] Embodiment 3 is basically the same as Embodiment 1, but has the following changes: in the (3) step, the glyphosate and Na 2 CO 3 The molar ratio is 0.061.

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Abstract

The invention relates to a method for synchronously reclaiming orthophosphorous acid and glyphosate in glyphosate production wastewater by a chemical precipitation method, which comprises the following steps: (1) adjusting the pH value of the glyphosate production wastewater by using hydrochloric acid; (2) adding CaCl2 solution into the wastewater to form calcium glyphosate and calcium phosphate filter cakes; (3) adding water into the filter cakes to blend the mixture, adding a certain amount of Na2CO3 into the blending solution, and generating CaCO3 precipitate after stirring reaction; and (4) filtering and separating the precipitated CaCO3, concentrating the filtered filtrate twice and removing NaCl to obtain concentrated solution of the glyphosate and the orthophosphorous acid, wherein the concentration of the glyphosate is 84.72 grams per liter; and the concentration of the orthophosphorous acid is 251.40 grams per liter. The total reclaiming rates of the glyphosate and the orthophosphorous acid are 88 percent and 89 percent respectively. The reclaiming treatment method of the invention can synchronously reclaim the glyphosate and the orthophosphorous acid in the wastewater to obtain the concentrated solution of the glyphosate and the orthophosphorous acid. The total reclaiming rates of the glyphosate and the orthophosphorous acid are 88 percent and 89 percent respectively.

Description

technical field [0001] The invention relates to a chemical process method, in particular to a chemical precipitation method for simultaneously recovering phosphorous acid and glyphosate in glyphosate production wastewater. Background technique [0002] Glyphosate is one of the pesticide varieties with the largest tonnage in my country at present. Its production and synthesis routes are mainly glycine route and IDA route, and the output of glyphosate produced by the glycine route accounts for more than 70% of the total output. It is the main grass Glyphosate production method. The amount of waste water produced by this synthesis route is large, the concentration of pollutants is high, and it is difficult to recycle and treat. For this reason, scientific research institutions, colleges and universities, enterprises and institutions at home and abroad have carried out long-term research. Up to now, there is no effective and economical and reasonable method to process the waste ...

Claims

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Application Information

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IPC IPC(8): C01B25/163C07F9/38C02F9/04C02F1/66
Inventor 彭盘英王玉萍诸葛蓉
Owner NANJING NORMAL UNIVERSITY
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