Exhaust gas treatment process for n-butyl isocyanate intermediate

A technology of n-butyl isocyanate and tail gas treatment, which is applied in the direction of air quality improvement, amino compound preparation, organic compound preparation, etc., can solve air pollution and other problems, achieve the effects of reducing side reactions, improving reaction efficiency, and increasing ratio

Inactive Publication Date: 2016-03-09
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, waste gas will be generated during production, and direct emission will cause air pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fill the primary reactor with ammonia first, and at the same time keep the temperature in the primary reactor at 100°C for 1-30 minutes, and keep the temperature in the primary reactor at 120°C for 31-60 minutes; Introduce n-butanol vapor at 118°C into the reactor, and add catalyst cobalt oxide into the primary reactor, keep stirring, and at the same time feed ammonia into the primary reactor; raise the temperature of the primary reactor To 195 ° C, and the reaction time is 3 hours, under the catalysis of the catalyst, the reactant reacts to improve the reaction rate, while reducing the generation of di- and tri-butylamine, thus increasing the ratio of n-butylamine, side reactions Further reduction, improved reaction efficiency;

[0024] Then feed nitrogen into the first-stage reactor for a flushing, and transfer the first-stage flushing gas to the second-stage reactor, and cool the temperature in the second-stage reactor to 130°C to separate dibutylamine ;

[0025] T...

Embodiment 2

[0030] Fill the primary reactor with ammonia first, and at the same time keep the temperature in the primary reactor at 95°C for 1-30 minutes, and keep the temperature in the primary reactor at 124°C for 31-60 minutes; Introduce n-butanol vapor at 121°C into the reaction kettle, and add catalyst cobalt oxide into the first-level reaction kettle, keep stirring, and at the same time, continuously feed ammonia into the first-level reaction kettle; raise the temperature of the first-level reaction kettle To 190 ° C, and the reaction time is 4 hours, under the catalysis of the catalyst, the reactant reacts to improve the reaction rate, and at the same time reduces the formation of di- and tri-butylamine, thus increasing the ratio of n-butylamine, side reactions Further reduction, improved reaction efficiency;

[0031] Then, nitrogen gas is injected into the first-stage reaction kettle to carry out a flushing, and the first-time flushing gas is transferred to the second-stage reacti...

Embodiment 3

[0037] Fill the primary reactor with ammonia first, and at the same time keep the temperature in the primary reactor at 90°C for 1-30 minutes, and keep the temperature in the primary reactor at 126°C for 31-60 minutes; Introduce n-butanol vapor at 123°C into the reactor, and add catalyst cobalt oxide into the primary reactor, keep stirring, and at the same time feed ammonia into the primary reactor; raise the temperature of the primary reactor To 185 ° C, and the reaction time is 5 hours, under the catalysis of the catalyst, the reactant reacts to improve the reaction rate, and at the same time reduces the generation of di- and tri-butylamine, thus increasing the ratio of n-butylamine, side reactions Further reduction, improved reaction efficiency;

[0038] Then, nitrogen gas is injected into the first-stage reaction kettle to carry out a flushing, and the first-time flushing gas is transferred to the second-stage reaction kettle, and the temperature in the second-stage reacti...

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PUM

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Abstract

The invention provides an exhaust gas treatment process for an n-butyl isocyanate intermediate. The process comprises the following steps: fully filling a reaction vessel with ammonia gas; introducing n-butanol vapor into the reaction vessel, and meanwhile, adding a catalyst cobalt oxide into the reaction vessel; heating up the reaction vessel; carrying out first-time gas purging on a reacted material with nitrogen gas, and collecting gas with a first-stage collecting tank; cooling the gas in the first-stage collecting tank; introducing nitrogen gas into the cooled first-stage collecting tank for second-time gas purging; introducing nitrogen gas into a third-stage reaction vessel for third-time gas purging, and transferring liquid in the reaction vessel into a rectifying still for rectification; and transferring the gas subjected to third-time gas purging into a cooling tank, and adding hydrochloric acid into the cooling tank. According to the process, by adopting the production process, side reactions are further reduced, and the reaction efficiency is increased; and meanwhile, exhaust gases are further treated more thoroughly, and formed nontoxic gases are discharged into air and cannot cause pollution to the air.

Description

technical field [0001] The invention relates to the field of plastic fine chemical production, in particular to a tail gas treatment process for n-butyl isocyanate intermediates. 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/16C07C211/03
CPCC07C209/16C07C211/03Y02A50/20
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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