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Tail gas treatment method of n-butyl isocyanate

A technology for treating n-butyl isocyanate and tail gas, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve problems such as air pollution, reduce the yield of n-butyl isocyanate, and reduce the reaction yield, and achieve reduction pollution effect

Active Publication Date: 2017-05-17
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the presence of n-butyl isocyanate produced by the traditional n-butyl isocyanate synthesis method reduces the yield of subsequent reactions, and the tail gas produced is directly discharged into the air, which easily causes air pollution and simultaneously reduces the yield of n-butyl isocyanate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First add xylene solution to the reactor, and cool the temperature in the reactor to -5°C; pass phosgene into the xylene solution for 45 minutes; then add n-butylamine solution dropwise to the reactor, and The temperature of the n-butylamine solution added dropwise is 10°C. Stir while adding dropwise, the time is 1.5 hours, cold reaction can be carried out, the generation of side reactions can be reduced, the material can be completely reacted, and the cold reaction can be completely reacted, reducing production of by-products;

[0025] Then continue to feed phosgene into the reactor, continue to stir, and continue to heat up the temperature in the reactor to 105° C. for 2 hours;

[0026] Feed nitrogen into the reaction kettle after the reaction to carry out a gas rush again, pass the mixed gas of a gas rush into the cooling kettle, and keep the temperature of the cooling kettle at 115 ° C, and the time is 30 ° C, while the cooling still is carried out keep stirring; ...

Embodiment 2

[0032] First add xylene solution to the reaction kettle, and cool the temperature in the reaction kettle to -4°C; pass phosgene into the xylene solution for 40 minutes; then add n-butylamine solution dropwise to the reaction kettle, and The temperature of the n-butylamine solution added dropwise is 12°C. Stir while adding dropwise, the time is 1.2 hours, cold reaction can be carried out, the generation of side reaction can be reduced, the material can be completely reacted, and the cold reaction can be completely reacted, reducing production of by-products;

[0033] Then continue to feed phosgene into the reaction kettle, continue to stir, and continue to heat up the temperature in the reaction kettle to 108° C. for 1.8 hours;

[0034] Feed nitrogen into the reacted reaction kettle again to carry out a gas rush, pass the mixed gas of a gas rush into the cooling kettle, and keep the temperature of the cooling kettle at 110 ° C, and the time is 35 ° C, while the cooling still is...

Embodiment 3

[0040] First add xylene solution to the reaction kettle, and cool the temperature in the reaction kettle to -3°C; pass phosgene into the xylene solution for 35 minutes; then add n-butylamine solution dropwise to the reaction kettle, and The temperature of the n-butylamine solution added dropwise is 14°C. Stir while adding dropwise, the time is 1.0 hour, can carry out cold reaction, reduce the generation of side reaction, can make material can react completely, can make cold reaction completely react, reduce production of by-products;

[0041] Continue to feed phosgene into the reaction kettle again, continue to stir, and continue to heat up the temperature in the reaction kettle to 110° C. for 1.5 hours;

[0042] Feed nitrogen into the reaction kettle after the reaction to carry out a gas rush again, pass the mixed gas of a gas rush into the cooling kettle, and keep the temperature of the cooling kettle at 108 ° C, and the time is 38 ° C, while the cooling still is carried out...

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PUM

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Abstract

The invention provides a tail gas treatment method for n-butyl isocyanate. The tail gas treatment method comprises the following steps that a xylene solution is added into a reaction kettle, and the temperature in the reaction kettle is lowered; phosgene is introduced into the xylene solution; an n-butylamine solution is dropwise added into the reaction kettle; the phosgene is continuously introduced into the reaction kettle; nitrogen is introduced into the reacted reaction kettle for first-time gas driving, and mixed gas obtained after first-time gas driving is performed is introduced into a cooling kettle; nitrogen is introduced into the cooling kettle for second-time gas driving, gas obtained after second-time gas driving is performed is transferred into a spraying kettle, and cold water is sprayed into the spraying kettle; third-time gas driving is performed on the spraying kettle; filtering is performed, fourth-time gas driving is performed on the filtered materials, gas obtained after fourth-time gas driving is performed is introduced into a NaOH solution, and the balance gas is directly exhausted into air. According to the production technology, tail gas can be stepwise treated, the components in the tail gas can be stepwise decomposed, then the tail gas can be treated more thoroughly, and therefore the pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the field of plastic fine chemical production, in particular to a tail gas treatment method of n-butyl isocyanate. Background technique [0002] Pure n-butyl isocyanate (C 4 h 9 NCO) is a colorless transparent liquid that is highly irritating to the skin, mucous membranes of the respiratory tract, and eyes, and can cause burns. Its vapor and air can form explosive mixtures, and it is easy to burn and explode when exposed to open fire or high heat. [0003] N-butyl isocyanate is active in chemical properties and is an important chemical raw material. It is mainly used for the synthesis of fungicides such as IPBC and benomyl, and is also used as a catalyst for the synthesis of sulfonylurea herbicides. It can be used to synthesize medicines, pesticides and other products. The traditional process is to add n-butylamine and o-dichlorobenzene into the reactor, pass in excess phosgene at 110-160°C, and then pass in phosgene for 20-3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/70
Inventor 过学军胡安胜吴建平高焰兵戴玉婷张军刘长庆徐小兵黄显超朱张
Owner ANHUI GUANGXIN AGROCHEM
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