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Technology for recovering chloromethane washing wastewater in glyphosate production

A technology for the recovery of methyl chloride, which is applied in the field of recovery of methyl chloride washing water in the production of glyphosate, can solve the problems of restricting the enlargement and optimization of production equipment, high labor intensity of workers, and high investment in production equipment, so as to achieve economic benefits and Significant social benefits, improve efficiency, and strengthen the effect of water washing and absorption

Inactive Publication Date: 2016-07-13
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of equipment materials and other factors, most of them adopt batch method, which seriously restricts the enlargement and optimization of production equipment. Factors such as low production efficiency, high labor intensity of workers, high investment in production equipment and large area occupied by batch crystallization process exist. And other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A process for recycling methyl chloride washing water in glyphosate production, the preparation process is as follows:

[0023] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine;

[0024] Then the aforementioned generates glyphosate acid under the action of hydrochloric acid, and produces a large amount of tail gas containing methyl chloride;

[0025] Then the tail gas in the aforementioned is washed by water washing tower, and then the gas after washing is passed through carbon tetrachloride absorption tower;

[0026] Then transfer the washed water in the above to the distillation tower, heat the temperature to 45°C, collect the evaporated gas, and cool the gas to 15°C for storage;

[0027] Then heat the above-mentioned distillation tower to 68°C, collect the evaporated gas and cool it to 10°C for storage.

[0028] The present invention adopts the above-mentioned production process, and adopts the treatment of...

Embodiment 2

[0030] A process for recycling methyl chloride washing water in glyphosate production, the preparation process is as follows:

[0031] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine;

[0032] Then the aforementioned generates glyphosate acid under the action of hydrochloric acid, and produces a large amount of tail gas containing methyl chloride;

[0033] Then the tail gas in the aforementioned is washed by water washing tower, and then the gas after washing is passed through carbon tetrachloride absorption tower;

[0034] Then transfer the washed water in the above to the distillation tower, heat the temperature to 45°C, collect the evaporated gas, and cool the gas to 15°C for storage;

[0035] Then heat the above-mentioned distillation tower to 68°C, collect the evaporated gas and cool it to 10°C for storage.

[0036] The present invention adopts the above-mentioned production process, and adopts the treatment of...

Embodiment 3

[0038] A process for recycling methyl chloride washing water in glyphosate production, the preparation process is as follows:

[0039] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine;

[0040] Then the aforementioned generates glyphosate acid under the action of hydrochloric acid, and produces a large amount of tail gas containing methyl chloride;

[0041] Then the tail gas in the aforementioned is washed by water washing tower, and then the gas after washing is passed through carbon tetrachloride absorption tower;

[0042] Then transfer the washed water in the above to the distillation tower, heat the temperature to 58°C, collect the evaporated gas, and cool the gas to 20°C for storage;

[0043] Then heat the above-mentioned distillation tower to 75°C, collect the evaporated gas and cool it to 15°C for storage.

[0044] The present invention adopts the above-mentioned production process, and adopts the treatment of...

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Abstract

The invention provides a technology for recovering chloromethane washing wastewater in glyphosate production. The technology comprises the following steps: paraformaldehyde and dimethyl phosphite are subjected to a condensation reaction under the actions of methyl alcohol and trimethylamine; glyphosphonic acid is generated under the action of hydrochloric acid, and a large amount of tail gas containing chloromethane is produced; the tail gas is washed through a water scrubber, and gas after washing is processed through a carbon tetrachloride absorption tower; wastewater after washing is transferred into a distillation tower, the temperature is increased to 58 DEG C, and evaporated gas is collected and cooled to 20 DEG C for storage; the distillation tower is heated to 75 DEG C, and evaporated gas is collected and cooled to 15 DEG C for storage. With adoption of the technology, the chloromethane washing wastewater is subjected to recovery treatment, so that consumption of methyl alcohol in production can be reduced, and the production cost can be saved.

Description

technical field [0001] The invention relates to the field of fine chemical production, in particular to a process for recycling methyl chloride washing water in glyphosate production. Background technique [0002] Glyphosate is a herbicide commercialized by Monsanto Company in the United States in 1974. Because of its high efficiency, low toxicity, low residue, broad spectrum, and good environmental compatibility, glyphosate has become the most widely used herbicide in the world. Broad range of herbicides. The production of glyphosate in my country started in the 1980s, mostly using the alkyl ester synthesis process with glycine, dimethyl phosphite, and paraformaldehyde as the main raw materials. This method has stable process and high yield, so it develops very rapidly. The method includes a multi-step reaction process of synthesis, hydrolysis and crystallization. Due to the limitation of equipment materials and other factors, most of them use batch method, which serious...

Claims

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Application Information

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IPC IPC(8): C07F9/38
CPCC07F9/3813
Inventor 朱礼华刘心龙余玉好马军
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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