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Method for recycling methylal in glyphosate wastewater

A technology of glyphosate wastewater and methylal, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as environmental pollution, waste, waste and environmental protection, and achieve improved recovery rate, effective recovery, The effect of reducing safety hazards

Active Publication Date: 2013-09-11
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps prevent accidents caused by excessive amounts of harmful chemicals from being released into our environment during industrial processes or accidentally spilled onto human skin that could cause health issues such as cancer if they are ingested through food products containing these substances.

Problems solved by technology

This patented technical problem addressed in this patents relates to how to recover valuable chemicals such as dichroic acids (chlormones) that are used in various industries like pesticides or fertilizers. These compounds can be harmful if released without being recovered because they enter the water processing facility where their presence poses potential health hazards.

Method used

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  • Method for recycling methylal in glyphosate wastewater

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Experimental program
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Effect test

Embodiment 1

[0010] After deacidification of glyphosate through the dealcoholization tank, the methyl chloride tail gas is condensed in three stages and washed in a multi-stage washing tower, the methyl chloride gas is compressed and recovered, and the condensate enters the dilute methanol storage tank. Wash the condensate with 3.5M 3 The flow rate per hour is poured into a preheating kettle at 50-60°C for 10-15 minutes, and the preheated feed liquid is pumped into a distillation tower through a high-pressure pump for distillation. The temperature at the bottom of the distillation tower is controlled at 103°C, and the temperature in the tower is Control the temperature at 65°C, the temperature at the top of the tower at 60°C, and the pressure of the steam valve at 0.15MPa. The low-boiling point methylal in the obtained product is discharged from the top of the distillation tower, and then enters the condenser to reflux and condense the material, and the reflux flow rate is 1.5M 3 / h, the ...

Embodiment 2

[0012] After deacidification of glyphosate through the dealcoholization tank, the methyl chloride tail gas is condensed in three stages and washed in a multi-stage washing tower, the methyl chloride gas is compressed and recovered, and the condensate enters the dilute methanol storage tank. Wash the condensate with 3.8M 3 The flow rate per hour is poured into a preheating kettle at 50-60°C for 10-15 minutes, and the preheated feed liquid is pumped into a distillation tower for distillation through a high-pressure pump. The temperature at the bottom of the distillation tower is controlled at 104°C, and the temperature in the tower is Control the temperature at 75°C, the temperature at the top of the tower at 63°C, and the pressure of the steam valve at 0.42MPa. The low boiling point methylal in the obtained product is discharged from the top of the distillation tower, and then enters the condenser to reflux and condense the material, and the reflux flow rate is 2.0M 3 / h, the ...

Embodiment 3

[0014] After deacidification of glyphosate through the dealcoholization tank, the methyl chloride tail gas is condensed in three stages and washed in a multi-stage washing tower, the methyl chloride gas is compressed and recovered, and the condensate enters the dilute methanol storage tank. Wash the condensate with 4.5M 3 The flow rate per hour is poured into a preheating kettle at 50-60°C for 10-15 minutes, and the preheated feed liquid is poured into a distillation tower through a high-pressure pump for distillation. The temperature at the bottom of the distillation tower is controlled at 105°C, and the temperature in the tower is The temperature is controlled at 85°C, the temperature at the top of the tower is controlled at 64°C, and the pressure of the steam valve is 0.75MPa. The low boiling point methylal in the obtained product is discharged from the top of the distillation tower, and then enters the condenser to reflux and condense the material, and the reflux flow rate...

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Abstract

The invention relates to a method for recycling methylal in glyphosate wastewater. The method comprises the following steps of: 1) treating the chloromethane tail gas obtained by deacidifying the glyphosate through a dealcoholization kettle with three-stage condensation and multi-stage washing in a water scrubber, wherein the chloromethane gas enters into a compression system so as to be recycled, and the condensate enters into a dilute methyl alcohol storage tank; pumping the condensate in the dilute methyl alcohol storage tank into a preheating kettle with the temperature of 50-60 DEG C to preheat the dilute methyl alcohol for 10-15min, then, distilling the preheated dilute methyl alcohol in a distillation tower; distilling out the low-boiling point methylal from the top of the distillation tower, discharging after reflowing and condensing, and conveying the condensate into a collection tank. The method not only can effectively reduce the potential safety hazards caused by wastewater discharge, but also can effectively recycle the methylal, and can improve the recovery rate of the methylal to be more than 96%.

Description

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Claims

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Application Information

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Owner HUBEI TAISHENG CHEM
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