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Methyl chloride washing technology in glyphosate production

A technology of methyl chloride and glyphosate, applied in the field of methyl chloride water washing process in glyphosate production, can solve the problems of restricting the enlargement and optimization of production equipment, high investment in production equipment, high labor intensity of workers, etc., and achieve economic and social benefits Significant, improve efficiency, strengthen the effect of water washing absorption

Inactive Publication Date: 2016-07-06
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

[0020] A kind of methyl chloride water washing process in the production of glyphosate, its preparation process is as follows:

[0021] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine; glyphosate acid is generated under the action of hydrochloric acid, and a large amount of tail gas containing methyl chloride is produced;

[0022] Then the tail gas in the above is washed once through the No. 1 washing tower, and the temperature of the first washing is 30°C, and then the gas after the first washing is washed twice through the No. 2 washing tower, and the temperature of the washing tower is 5°C. Then the gas after the secondary water washing is passed through the sodium hydroxide solution, wherein, 10% of the sodium hydroxide solution removes the residual hydrogen chloride gas, and then the gas is washed three times through the No. three water washing tower, and the temperature of the three water washings is 20 ℃, washi...

Embodiment 2

[0027] A kind of methyl chloride water washing process in the production of glyphosate, its preparation process is as follows:

[0028] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine; glyphosate acid is generated under the action of hydrochloric acid, and a large amount of tail gas containing methyl chloride is produced;

[0029] Then the tail gas in the above is washed once through the No. 1 washing tower, and the temperature of the first washing is 35°C, and then the gas after the first washing is washed twice through the No. 2 washing tower, and the temperature of the washing tower is 8°C. Then the gas after the secondary water washing is passed through the sodium hydroxide solution, wherein, 10% of the sodium hydroxide solution is used to remove the residual hydrogen chloride gas, and then the gas is washed three times through the No. three water washing tower, and the temperature of the three water washings is 23...

Embodiment 3

[0034] A kind of methyl chloride water washing process in the production of glyphosate, its preparation process is as follows:

[0035] First, paraformaldehyde is condensed with dimethyl phosphite under the action of methanol and triethylamine; glyphosate acid is generated under the action of hydrochloric acid, and a large amount of tail gas containing methyl chloride is produced;

[0036] Then the tail gas in the above is washed once through the No. 1 washing tower, and the temperature of the first washing is 40°C, and then the gas after the first washing is washed twice through the No. 2 washing tower, and the temperature of the washing tower is 10°C. Then the gas after the secondary water washing is passed through the sodium hydroxide solution, wherein, 15% of the sodium hydroxide solution is used to remove the residual hydrogen chloride gas, and then the gas is washed three times through the No. three water washing tower, and the temperature of the three water washings is 2...

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Abstract

The invention provides a methyl chloride washing technology in glyphosate production. The preparation technology comprises the following steps of: firstly, carrying out condensation reaction on paraformaldehyde and dimethyl phosphate under the action of methanol and triethylamine; generating a glyphosate acid under the action of hydrochloric acid, and generating a lot of tail gas containing methyl chloride; carrying out primary washing on the tail gas through a first washing tower, carrying out secondary washing on the firstly washed gas through a second washing tower, removing a residual hydrogen chloride gas from the secondly washed gas through a sodium hydroxide solution, and carrying out tertiary washing on the gas through a third washing tower; removing impurities in a methyl chloride tail gas from the thirdly washed gas through activated carbon; and finally heating the gas treated through the activated carbon and further purifying the methyl chloride. By the production technology, consumption of methanol in production can be reduced by methyl chloride washing water recycling treatment; the production cost is lowered.

Description

technical field [0001] The invention relates to the field of fine chemical production, in particular to a process for washing glyphosate with methyl chloride. Background technique [0002] Glyphosate is a herbicide commercialized by Monsanto Company in the United States in 1974. Because of its superior performance, 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 seriously restricts the enl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C17/389C07C19/03
CPCC07C17/38C07C17/389C07C19/03
Inventor 朱礼华刘心龙余玉好马军
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD