Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for co-producing amine salt by using prochloraz acylation acid tail gas

A technology of prochloraz acylation acidity and tail gas co-production, which is applied in chemical instruments and methods, separation methods, preparation of organic compounds, etc., can solve the problems of large liquid alkali consumption, reduce environmental protection treatment costs, and reduce treatment costs , the effect of reducing pollution

Pending Publication Date: 2020-07-03
江西汇和化工有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the preparation process of prochloraz reported in the prior art, usually manufacturers directly neutralize the hydrogen chloride in this part of the tail gas with liquid caustic soda, and also some manufacturers first absorb the hydrogen chloride in the part of the tail gas through falling film, and then become Waste hydrochloric acid should be treated as hazardous waste. However, the above two treatment methods are not advisable. If it is absorbed by liquid caustic soda, not only will it consume a large amount of liquid caustic soda, but also the part of high-salt water will be desalinated by three-effect evaporation distillation before reuse. Only after biochemical treatment can it be discharged, and if it is absorbed by falling film and then sent out as hazardous waste, it will also cost a lot of treatment costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for co-producing amine salt by using prochloraz acylation acid tail gas
  • Method for co-producing amine salt by using prochloraz acylation acid tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare the toluene solution of the amide in the amination salt-forming kettle in advance (the mass volume ratio of the amide to toluene is 5:1), start stirring, control the temperature of the kettle within the range of 15°C to 25°C, and mix prochloramide The acidic tail gas is passed into the amine salt salt forming kettle through the buffer tank. During the process of passing the acidic tail gas, observe the online pH meter of the amine salt salt forming kettle. The pH value gradually decreases from 10. When the pH value reaches 3~ At 4 o'clock, the exhaust gas was stopped, and the amine salt was obtained through a subsequent process to obtain a white wet product amine salt, the content of the amine salt was 99.8%, and the yield was 96.7%.

Embodiment 2

[0030] In the amination salt-forming kettle, prepare the toluene solution of the amide in advance (the mass volume ratio of the amination to toluene is 3:1), start stirring, control the temperature of the kettle within the range of 15°C to 25°C, and mix the prochloramide The acidic tail gas is passed into the amine salt salt forming kettle through the buffer tank. During the process of passing the acidic tail gas, observe the online pH meter of the amine salt salt forming kettle. The pH value gradually decreases from 10. When the pH value reaches 1~ At 2 o'clock, the exhaust gas was stopped, and the amine salt was obtained through a subsequent process to obtain a white wet product amine salt, the content of the amine salt was 99.6%, and the yield was 96.5%.

Embodiment 3

[0032] In the amination salt-forming kettle, prepare the xylene solution of the amination in advance (the mass volume ratio of the amination to toluene is 6:1), start stirring, control the temperature of the kettle within the range of 15°C to 25°C, and mix prochloraz The acylated acidic tail gas is passed into the amine salt salt forming tank through the buffer tank. During the process of passing the acidic tail gas, observe the online pH meter of the amine salt salt forming tank. The pH value gradually decreases from 10. When the pH value reaches 3 At ~4 o'clock, the exhaust gas was stopped, and the amine salt was obtained through the follow-up process as a white wet amine salt, the content of the amine salt was 99.7%, and the yield was 96.6%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of tail gas treatment. The invention particularly relates to a method for co-producing amine salt by using prochloraz acylation acid tail gas. The method comprises the following steps: (1) introducing acidic tail gas generated by a prochloraz acylation reaction into an organic solution of an amide at the temperature of -5 DEG C to 45 DEG C, enabling hydrogen chloride in the acidic tail gas to react with the amide to generate an amine salt, and controlling the pH to be between 1 and 5 at the reaction endpoint, (2) sequentially carrying out primary falling film absorption and secondary falling film absorption treatment on the residual acid tail gas after the reaction in the step (1) at the temperature of -10 DEG C to 30 DEG C, and (3) treating theresidual acid tail gas after treatment in the step (2) through a phosgene destroying tower, absorbing the residual acid tail gas through alkali liquor, and discharging the residual acid tail gas at high altitude. The tail gas in the acylation reaction process for producing prochloraz is turned into wealth and recycled, so that the production cost of prochloraz can be reduced, the environmental protection treatment load can be reduced, the environmental protection treatment cost can be reduced, and the environmental safety can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a method for acylation of acid tail gas with prochloraz to co-produce amine salt. Background technique [0002] Prochloraz (Prochloraz), the chemical name is N-propyl-N-(2,4,6-trichlorophenoxyethyl)-1H-imidazole-1-carboxamide, was established by British BootsCo., Ltd. in 1974 Synthesized in 1977, a broad-spectrum imidazole-based high-altitude fungicide introduced to the market in 1977, it works by inhibiting the biosynthesis of sterols, and has a good control effect on various pathogens of rice, fruits and cereals. [0003] At present, domestic manufacturers all adopt the etherification of 2,4,6-trichlorophenol and dichloroethane in sodium hydroxide, followed by amination, acyl chloride and condensation to produce prochloraz. The production process is basically the same. The technological process is as follows: use 2,4,6-trichlorophenol as the starting mat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/14B01D53/68B01D53/00C07C213/08C07C217/20
CPCB01D53/005B01D53/1406B01D53/1456B01D53/68B01D53/75B01D53/78B01D2252/103B01D2252/205C07C213/08C07C217/20
Inventor 尹旺华韩井卫曾小明
Owner 江西汇和化工有限公司