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Isophthalonitrile catalytic hydrogenation method

A technology for the catalytic hydrogenation of isophthalonitrile, which is applied in chemical instruments and methods, catalyst carriers, and the preparation of organic compounds. Catalyst shortened service life and other issues to achieve the effect of improving activity and stability, simplifying operation and reducing hydrogenation cost

Inactive Publication Date: 2007-10-31
上海博润石化科技发展有限公司
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Problems solved by technology

[0006] In the above technical scheme, although high-purity m-xylylenediamine products can be produced, due to the low catalyst activity, the yield of m-xylylenediamine is still unsatisfactory under mild hydrogenation conditions. It has acidity, which will accelerate a series of condensation reactions between hydrogenation intermediate products and products. The generated polymer covers the surface of the catalyst, which significantly shortens the service life of the catalyst and requires frequent regeneration.
In addition, if a small amount of water is brought into the reaction raw materials, the acidity of the catalyst will cause the side reaction of the hydrolysis of the raw material or intermediate product cyano group, which will also affect the operating cycle of the catalyst

Method used

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  • Isophthalonitrile catalytic hydrogenation method
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Embodiment 1～8

[0025] The hydrogenation reactor is two φ25mm×1000mm stainless steel tubular reactors in series. The reaction tubes are filled with 50ml (first stage) and 25ml (second stage) of nickel-containing catalysts with a diameter of 1 / 8″ respectively, and the bottom of the reactor is filled with inert ceramic balls. .Catalyst Ni / MgO-SiO 2 The content of Ni in the medium is 22%, the content of NiO is 46%, the content of MgO is 1-2%, and the rest is carrier.

[0026] The m-xylene-isophthalonitrile-liquid ammonia solution is preheated and then pumped into the first-stage hydrogenation reactor from the top at a set rate. The hydrogen enters the reactor through the gas distributor. After the raw materials are mixed with the hydrogen Enter the catalyst bed for hydrogenation reaction. The first-stage hydrogenation temperature is 60-90°C, the second-stage hydrogenation temperature is 110-130°C, the reaction pressure is 11.5MPa, the molar ratio of hydrogen to raw material isophthalonitrile is...

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Abstract

The invention discloses an isophthalonitrile catalytic hydrogenation method, which comprises the following steps: introducing MgO into Ni / SiO2 activator; transforming isophthalonitrile to m-tolylenediamine with Ni / MgO-SiO2 activator; hydrotreating in two series tubular reactor. This invention can prolong durability of activator and improve hydrogenation receiving ratio distinctively.

Description

technical field [0001] The invention relates to a method for catalytic hydrogenation of isophthalonitrile, in particular to using mixed xylene and liquid ammonia as solvents, using Ni / MgO-SiO 2 Catalyst and two-stage hydrogenation process to completely convert isophthalonitrile to m-xylylenediamine. Background technique [0002] M-xylylenediamine is mainly used in epoxy resin curing agent and nylon modified polymer monomer. Usually m-xylylenediamine is produced by hydrogenation of isophthalonitrile. The hydrogenation reaction can adopt tank-type intermittent hydrogenation or fixed-bed continuous hydrogenation process, and the catalysts are all fine-grained catalysts or granular fixed-bed catalysts with nickel as the active component. From the comparison of hydrogenation effect, product quality and production cost, it can be seen that the batch hydrogenation process is obviously inferior to the continuous process in terms of product yield, production cost and product qualit...

Claims

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Application Information

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IPC IPC(8): C07C209/48C07C211/51B01J23/755B01J21/10B01J32/00
Inventor 倪俊
Owner 上海博润石化科技发展有限公司
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