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Methyl chloroformate exhaust gas treatment process

A methyl chloroformate and tail gas treatment technology, which is applied in the purification/separation of carbonate/haloformate, steam condensation, smoke removal, etc., can solve the high unit consumption of methyl chloroformate and the heavy load of the tail breaking system and other problems, to achieve the effect of increased yield and reduced load

Inactive Publication Date: 2015-10-28
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tail gas from the synthesis of the original methyl chloroformate tower is directly connected to the tail breaking system without any capture facilities, resulting in a large load on the tail breaking system on the one hand; on the other hand, the unit consumption of methyl chloroformate is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, the synthesis of methyl chloroformate: first add methanol to the reaction tower, control the reaction temperature to 22°C, then methanol enters the esterification tower from the bottom side of the esterification tower, and phosgene enters the esterification tower from the other side, Keep the molar ratio of phosgene to methanol at 1.05:1, the reaction temperature is 36°C, and then use nitrogen to catch the tail gas;

[0019] Second, one-time capture: the tail gas is sent into the capture tower through the pipeline, and the tail gas enters from the bottom of one side of the capture tower, and then outputs from the top of the capture tower, with a capture temperature of 18°C;

[0020] Again, secondary capture: the tail gas after the first capture is passed into the capture tank, and the tail gas enters from the bottom of one side of the capture tank, the capture temperature is 11°C, and finally the temperature of the tail gas is raised to 38°C After that, pass thro...

Embodiment 2

[0023] First, the synthesis of methyl chloroformate: first add methanol to the reaction tower, control the reaction temperature to 25°C, then methanol enters the esterification tower from one side of the bottom of the esterification tower, and phosgene enters the esterification tower from the other side, Keep the mol ratio of phosgene to methanol at 1.1:1, the reaction temperature is 40°C, and then use nitrogen to catch the tail gas;

[0024] Second, one-time capture: the tail gas is sent into the capture tower through the pipeline, and the tail gas enters from the bottom of one side of the capture tower, and then outputs from the top of the capture tower, with a capture temperature of 18°C;

[0025] Again, secondary capture: the tail gas after the first capture is passed into the capture tank, and the tail gas enters from the bottom of one side of the capture tank, the capture temperature is 12°C, and finally the tail gas is heated to 35°C After that, pass through the exhaust...

Embodiment 3

[0028] First, the synthesis of methyl chloroformate: first add methanol to the reaction tower, control the reaction temperature to 26 ° C, then methanol enters the esterification tower from the bottom side of the esterification tower, and phosgene enters the esterification tower from the other side, Keep the molar ratio of phosgene to methanol at 1.08:1, the reaction temperature is 39°C, and then use nitrogen to catch the tail gas;

[0029] Second, one-time capture: the tail gas is sent into the capture tower through the pipeline, and the tail gas enters from the bottom of one side of the capture tower, and then outputs from the top of the capture tower, with a capture temperature of 17°C;

[0030] Again, secondary capture: the tail gas after the first capture is passed into the capture tank, and the tail gas enters from the bottom of one side of the capture tank, the capture temperature is 11°C, and finally the tail gas is heated to 36°C After that, pass through the exhaust g...

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PUM

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Abstract

The present invention provides a methyl chloroformate exhaust gas treatment process. The process is as below: synthesis of methyl chloroformate: first adding methanol into a reaction tower, then introducing the methanol from one side of an esterification column bottom and introducing phosgene from the other side into the esterification column, keeping the molar ratio of phosgene to methanol at (1.05-1.1):1, and expelling the exhaust gas by nitrogen; a first trap: sending the exhaust gas into a trap tower through a pipe from the one side of the bottom of the trap tower, and discharging the exhaust gas from the top of the trap tower; and a second trap: sending the exhaust gas after the first trap into a trap autoclave from one side of the trap autoclave and sending into an exhaust gas damage system. A trapping system installed at the exhaust outlet of the methyl chloroformate tower comprise a trap column and a trap autoclave, so that the methyl chloroformate carried by the exhaust gas is fully captured down. According to the production data, the load of tail broken system is greatly reduced, while the yield of methyl chloroformate is increased by 5%.

Description

technical field [0001] The invention relates to the field of pesticide production, in particular to a tail gas treatment process of methyl chloroformate. Background technique [0002] Methyl chloroformate is an organic compound that is highly toxic, flammable and corrosive. Colorless liquid with strong pungent odor; Molecular weight: 94.50; Vapor pressure: 16.93kPa / 20℃; Flash point: 18~23℃; Boiling point: 71.4℃; Insoluble in water, soluble in most organic substances such as benzene, methanol, ether, etc. Solvent; relative density (water = 1) 1.22; relative density (air = 1) 3.26; stable; slightly soluble in water and gradually decomposed by water. It has a lachrymatory effect, and the vapor strongly irritates the eyes and respiratory tract, and can also cause poisoning through skin absorption. [0003] Industrially, it is derived from the esterification of methanol and phosgene. When producing by batch method, phosgene is passed into methanol and stirred and reacted in a ...

Claims

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Application Information

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IPC IPC(8): B01D5/00B08B15/04C07C69/96C07C68/08
Inventor 过学军吴建平胡安胜刘长庆张军徐小兵朱张
Owner ANHUI GUANGXIN AGROCHEM
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