Method and device for treating paraformaldehyde dust during material feeding of glyphosate production

A technology of paraformaldehyde and glyphosate, which is applied in separation methods, chemical instruments and methods, and compounds of elements in Group 5/15 of the periodic table, etc. , increase the environmental protection burden and other issues, to achieve the effect of obvious emission reduction benefits, fast depolymerization, and good absorption effect

Active Publication Date: 2020-03-06
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The traditional process uses water, alkali or glyphosate mother liquor to absorb the dust generated during the paraformaldehyde feeding process. Although it has played a role in eliminating dust, it has the following problems: (1) the absorption liquid is all taken into the mother liquor, and the active ingredient formaldehyde in it is It has not been utilized; (2) Both absorbent and paraformaldehyde / formaldehyde are collected into mother liquor or other production wastewater, and it is extremely difficult to dispose of aldehyde-containing wastewater, which increases the burden on environmental protection; (3) The absorption effect is poor, and the absorption fluid needs to be replaced frequently , the consumption of absorption liquid is large, and the absorption effect is particularly poor at low temperature

Method used

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  • Method and device for treating paraformaldehyde dust during material feeding of glyphosate production
  • Method and device for treating paraformaldehyde dust during material feeding of glyphosate production

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Effect test

Embodiment 1

[0038] A treatment device for paraformaldehyde dust in the feeding process of glyphosate production. The paraformaldehyde feeding port is connected to the dust collection hood. After the dust collection hood is connected to the fan through the pipeline, it is then connected to the bottom of the alcohol washing tower, and the dust tail gas pipeline goes deep. To the bottom of the alcohol scrubber; the catalyst pipeline and the methanol pipeline are connected to the lower part of the alcohol scrubber; the top of the alcohol scrubber is connected to the condenser through the pipeline, and the condenser is connected to the non-condensable gas vent.

[0039] The condenser is connected to the buffer tank, and the buffer tank is connected to the synthesis tank; the paraformaldehyde feeding port is connected to the synthesis tank, and a methanol inlet pipe is also arranged on the upper part of the synthesis tank. The bottom of the alcohol washing tower is respectively connected with th...

Embodiment 2

[0041] A treatment method for paraformaldehyde dust in the feeding process of glyphosate production. The paraformaldehyde dust tail gas is collected through the absorption cover, sucked by the fan and blown into the alcohol washing tower, and the dust tail gas pipeline is lowered into the absorption liquid level at the bottom of the tower Below, the dust tail gas contacts the absorption liquid at the bottom of the tower, and reacts and absorbs under the action of the catalyst; the incompletely reacted paraformaldehyde dust overflows with the tail gas and flows upward along the tower, fully contacting the absorption liquid sprayed from top to bottom And react to completely remove paraformaldehyde dust and generate formaldehyde and hemiacetal; the absorption liquid is reused for glyphosate synthesis, specifically for the depolymerization stage of glyphosate synthesis. The absorption liquid at the bottom of the tower is methanol, and the amount of methanol is excessive relative to...

Embodiment 3

[0043]A treatment method for paraformaldehyde dust in the feeding process of glyphosate production. The paraformaldehyde dust tail gas is collected through an absorption cover, sucked by a fan and blown into the lower part of the alcohol washing tower. The inlet of the dust tail gas pipeline is above the liquid level of the absorption liquid at the bottom of the tower , the dust tail gas is in contact with the absorption liquid at the bottom of the tower, and reacts and absorbs under the action of the catalyst; the incompletely reacted paraformaldehyde dust overflows with the tail gas and flows upward along the tower, and fully contacts with the absorption liquid sprayed from top to bottom. reaction, completely remove paraformaldehyde dust, and generate formaldehyde and hemiacetal; the absorption liquid is reused for glyphosate synthesis, specifically for the depolymerization stage of glyphosate synthesis. The absorption liquid at the bottom of the tower is methanol, and the am...

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Abstract

The invention discloses a method and device for treating paraformaldehyde dust during material feeding of glyphosate production. A paraformaldehyde feeding mouth is connected with a dust suction hood,and after the dust suction hood is connected with a fan through a pipeline, then the dust suction hood is connected to the bottom of an alcohol washing tower; a dust exhaust pipeline is connected deeply to the tower bottom of the alcohol washing tower, and after a catalyst pipeline and a methanol pipeline are merged, the merged pipeline is connected to the lower part of the alcohol washing tower;and the top of the alcohol washing tower is connected with a condenser through a pipeline, and the condenser is connected to a non-condensable gas vent. According to the technical scheme, the paraformaldehyde feeding dust during production of glyphosate is absorbed through adoption of methanol as an absorbent and an alkoxy metal organic compound as a catalyst, the absorption speed is fast, the absorption effect is good, the absorbent can be reused, and benefits of consumption reduction and emission reduction are significant.

Description

technical field [0001] The invention belongs to the technical field of glyphosate production, in particular to a method and device for controlling paraformaldehyde dust in the glyphosate production and feeding process. Background technique [0002] Glyphosate is a high-efficiency, low-toxicity, broad-spectrum, and herbicide of systemic conduction type. There are two mainstream production methods, one is the production method using iminodiacetic acid (IDA) as the raw material, and the other is the production method using The production method of glycine and alkyl phosphite as raw materials. my country's glyphosate production started in the 1980s, and the glycine-alkyl ester method is the leading method (process) for glyphosate production in my country. The method uses methanol as a solvent and triethylamine as a catalyst, first synthesizes a synthetic liquid with an organic phosphine intermediate as the main component, and then hydrolyzes it under acidic conditions to obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/90B01D53/72B01D53/96C07F9/38
CPCB01D53/72B01D53/75B01D53/90B01D53/96C07F9/3813
Inventor 李晓晴胡波
Owner HUBEI TAISHENG CHEM
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