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Process for continuously producing m-xylylenediamine

A m-xylylenediamine and isophthalonitrile technology, which is applied in the field of continuous m-xylylenediamine production, can solve the problems of low m-xylylenediamine selectivity, discontinuous operation, and low production efficiency. , to achieve the effect of easy control, shortening time and simplifying operation

Pending Publication Date: 2022-06-28
河南尤尼特化工新材料有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of technique of continuous production m-xylylenediamine, what solve is that in the prior art, high-pressure reactor operation is discontinuous, production efficiency is low, product m-xylylenediamine selectivity is not high, energy consumption Higher questions

Method used

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  • Process for continuously producing m-xylylenediamine
  • Process for continuously producing m-xylylenediamine
  • Process for continuously producing m-xylylenediamine

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experiment example

[0024] According to the production process of the present invention, after the content of isophthalonitrile and the content of m-xylylenediamine in the original solution after the reaction is measured by a gas chromatograph, the specific test results are shown in figure 2 .

[0025] According to the method of the present invention, after the IPN is mixed with the solvent, the reaction assistant and the catalyst, a constant flow pump is added to the reactor, and the reaction is carried out continuously in the reactor under the uniform and stable force of hydrogen, and the main reaction data is the calibration for 72 hours. and running continuously:

[0026]

[0027] Conclusion: The production process can be continuously produced, has high production efficiency, and can be controlled and safely produced, so that the conversion rate of isophthalonitrile is 100%, and the selectivity of m-xylylenediamine is more than 95%. At the same time, the consumption of catalyst is reduce...

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Abstract

The invention belongs to the technical field of toluene dimethylamine preparation, and particularly relates to a process for continuously producing m-xylylenediamine, which comprises the following steps: enabling m-phthalonitrile, a solvent and a reaction aid to be in contact with a granular solid catalyst under the pushing of hydrogen pressure, carrying out three-phase hydrogenation reaction, then entering a solid-liquid separator, and carrying out solid-liquid separation to obtain m-xylylenediamine; separating the separated liquid to obtain a target product, recycling the catalyst after solid-liquid separation, activating after the activity is reduced, and then recycling. Compared with conventional single-kettle fixed bed high-pressure operation production, the production process has the advantages that the process is stable and easy to operate, so that the product quality is stable, byproducts are few, the conversion rate is high, the production is safe and stable, and the energy consumption is low; the conversion rate of phthalonitrile reaches 100%, the selectivity of m-xylylenediamine is 95% or above, and meanwhile, the consumption of hydrogen, steam and a catalyst is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of xylylenediamine, in particular to a process for continuous production of m-xylylenediamine. Background technique [0002] Meta-xylylenediamine (m-Xylylenediamine, abbreviated as MXDA, CAS1477-55-0) is an aliphatic amine containing an aromatic ring, which is widely used because of its excellent physical and chemical properties. m-xylylenediamine is a low-toxic epoxy resin curing agent with excellent performance, excellent curing performance at room temperature, excellent heat resistance, water resistance and chemical resistance; m-xylylenediamine (MXDA) reacts with adipic acid It is polymerized into nylon PAMXD6 with high temperature resistance and good barrier properties. It reacts with isocyanate to produce m-xylylene isocyanate (MXDI), and acts as a good curing agent with epoxy resin. It is also used in rubber additives, photosensitive materials, pesticides, coatings, fiber finishing age...

Claims

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Application Information

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IPC IPC(8): C07C209/86C07C211/27B01J8/26B01J25/00
CPCC07C209/48C07C209/86B01J8/12B01J8/14B01J25/00C07C211/27
Inventor 郑天成宁崇克王若聪邹连生海伟王子昊杨虎群李晨阳胡城华贾昊天
Owner 河南尤尼特化工新材料有限公司
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