Preparation method of phenylmethylamine

By using a fixed-bed hydrogenation reactor and a metal-supported catalyst for multi-phase continuous hydrogenation reaction in the preparation of benzylamine, the problems of high catalyst loss and low production efficiency are solved, and efficient and environmentally friendly preparation of benzylamine is achieved. Achieve more than 98% selectivity and stability.

CN104557564AActive Publication Date: 2015-04-29SHANGHAI HUAYI GRP CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI HUAYI GRP CO
Filing Date
2014-12-16
Publication Date
2015-04-29

AI Technical Summary

Technical Problem

The existing technology has problems such as high catalyst loss, low production efficiency, and high labor intensity in intermittent operations, making it difficult to meet environmental protection requirements and efficient production needs in the preparation process of benzylamine.

Method used

A fixed-bed hydrogenation reactor is used, and a metal-supported catalyst (such as Pd, Pt, Cu, Ni, Mo, Fe) is used with benzonitrile and solvent in a mixing unit to perform multi-phase continuous hydrogenation reaction, and is separated by simple distillation Obtain high-purity benzylamine, reduce catalyst loss and improve production efficiency.

Benefits of technology

It achieves low catalyst loss, high production efficiency, small intermittent operation labor force, meets environmental protection requirements, and achieves benzylamine selectivity of more than 98% by optimizing reaction conditions, improving operational stability and separation convenience.

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Abstract

The invention relates to a preparation method of phenylmethylamine. The technical scheme adopted by the invention for mainly solving the problems of high catalyst loss, low production efficiency and high intermittent operation labor intensity is as follows: the preparation method of the phenylmethylamine comprises the following steps: mixing the raw material of cyanobenzene with a solvent material or at least one of one part of product materials in a mixing unit, introducing the mixture into a fixed bed hydrogenation reactor to be in contact with hydrogen and a catalyst and carry out multi-phase continuous hydrogenation reaction to obtain a product material containing phenylmethylamine, separating the product material to obtain a phenylmethylamine product, wherein the catalyst is a metal loaded catalyst; and the metal is selected from at least one of Pd, Pt, Cu, Ni, Mo and Fe. The preparation method can be used for preparing phenylmethylamine.
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