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A kind of system and method for preparing anilinoacetonitrile

A technology of anilinoacetonitrile and hydroxyacetonitrile, which is applied in the system field of preparing anilinoacetonitrile, can solve the problems of low product quality and reaction yield, achieve the effects of improving product quality and reaction yield, improving reaction efficiency, and reducing polymerization

Active Publication Date: 2021-11-30
CHONGQING UNISPLENDOUR CHEM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

And during continuous reaction, in order to ensure that the residue of hydroxyacetonitrile and aniline in the product reaches the industry standard, it is required to enter the excessive state of the mol ratio of hydroxyacetonitrile, which causes the hydroxyacetonitrile of the whole reaction system to be in excess all the time, easily causing the generation of disubstituted impurities (C 5 h 5 NH 2 +2HOCH 2 CN=C 6 h 5 NH(CH 2 EN) 2 +2H 2 O), cause product quality and reaction yield to be on the low side

Method used

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  • A kind of system and method for preparing anilinoacetonitrile
  • A kind of system and method for preparing anilinoacetonitrile
  • A kind of system and method for preparing anilinoacetonitrile

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Effect test

Embodiment 1

[0044]The hydroxyacetonitrile and aniline are input into the reaction system at an initial molar ratio of 1.01-1.05:1, and preheated to a specific temperature, and the outlet pH of the reaction solution is adjusted to 6.5-7.5 by a catalyst. The split flow meter sends 30% to 70% of the hydroxyacetonitrile and the catalyst into the first-stage mixer of the system to mix with aniline and then enters the first-stage reactor for reaction; the remaining 70% to 30% of the hydroxyacetonitrile and the catalyst enter the second-stage mixer It is mixed with the reaction material from the first-stage reactor and then enters the second-stage reactor for reaction. The time for aniline and hydroxyacetonitrile to obtain anilinoacetonitrile from entering the first-stage mixer to the outlet of the second-stage reactor is 50 to 100 s. Sampling at the outlet of the reactor finally yielded a product with a main mass content of 97.0% and a water content of 2.5%; the total yield of the product p-ani...

Embodiment 2

[0046] The hydroxyacetonitrile and aniline are input into the reaction system at an initial molar ratio of 1.01-1.05:1, and preheated to a specific temperature, and the outlet pH of the reaction solution is adjusted to 6.0-8.0 through a catalyst. The split flow meter sends 30% to 40% of the hydroxyacetonitrile and the catalyst into the first-stage mixer of the system to mix with anilinoacetonitrile and then enters the first-stage reactor for reaction, and 30% to 50% of the hydroxyacetonitrile and the catalyst enter the second-stage mixer After mixing with the reactant flow of the first-stage reactor, it enters the second-stage reactor for reaction, and the remaining 40% to 10% of hydroxyacetonitrile and the catalyst enter the third-stage mixer and mix with the materials from the second-stage reactor, and then enter the three-stage tubular reaction Reactor. The time for aniline and hydroxyacetonitrile to obtain anilinoacetonitrile from entering the first-stage mixer to the outl...

Embodiment 3

[0048] The hydroxyacetonitrile and aniline are input into the reaction system at an initial molar ratio of 1.01-1.05:1, and preheated to a specific temperature, and the outlet pH of the reaction solution is adjusted to 6.0-8.0 through a catalyst. 70% of the hydroxyacetonitrile and the catalyst are sent into the first-stage mixer of the system through a split flow meter to mix with aniline and then enter the first-stage reactor for reaction; the remaining 30% of the hydroxyacetonitrile and the catalyst enter the second-stage mixer and the first-stage reactor. The reaction materials are mixed and then enter the second stage reactor for reaction. Sampling at the outlet of the reactor showed that the content of hydroxyacetonitrile in the water phase was 0.6%, and the content of aniline in the oil phase was 0.43%.

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Abstract

The invention relates to a preparation system and method of anilinoacetonitrile. First of all, the present invention provides an improved tubular continuous reaction system, which controls the reaction of the materials through the flow or mass meter of the materials entering the system, and adopts a new feeding method and adopts a mixing element. Reactor, so the system can enhance the mass transfer and heat transfer of the reaction raw materials and improve the reaction efficiency. In addition, the present invention also provides a preparation method of anilinoacetonitrile, which is realized by using the above reaction system. This method can reduce the generation of disubstituted impurities of hydroxyacetonitrile to aniline, and can also reduce the amount of hydroxyacetonitrile under the influence of the basic catalyst. Polymerization improves product quality and reaction yield.

Description

technical field [0001] The present invention relates to a system and method for preparing anilinoacetonitrile from aniline and hydroxyacetonitrile. Background technique [0002] Anilinoacetonitrile is khaki or tan powder, insoluble in water but easily soluble in acetone. It is mainly used in the synthesis of the dye indigo, and can also be used in other organic synthesis. [0003] There are many methods for preparing anilinoacetonitrile, among which the hydroxyacetonitrile method is to generate anilinoacetonitrile and water by mixing and reacting aniline and hydroxyacetonitrile as raw materials. The chemical formula of the reaction is: C 5 h 5 NH 2 +HOCH 2 CN=C 6 h 5 NHCH 2 CN+H 2 O. [0004] The current method for industrial production of anilinoacetonitrile is a continuous synthesis method in which tubes and kettles are connected in series (the preparation method of anilinoacetonitrile "ZL200910103536.5"). Compared with the batch reaction of the kettle, this meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/24C07C253/30
Inventor 徐代行郑道敏俸忠明张正伟张飞
Owner CHONGQING UNISPLENDOUR CHEM
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