Method for preparing benzylamine through direct atmospheric hydrogenation of benzonitrile

Abstract

The invention discloses a method for continuously preparing benzylamine through direct atmospheric hydrogenation of benzonitrile in a fixed-bed reaction unit. According to the method, benzonitrile isused as a raw material and directly fed into the fixed-bed reaction unit for catalytic synthesis of benzylamine; a catalyst used in the method is any one selected from the group consisting of Co, Ni,Cu, Mn, Cr, Zn, Fe, Mo and Mg or a mixture of more selected from the group and mixed in any ratio; and then simple coprecipitation is carried out to prepare benzylamine. The method of the invention uses the cheap non-precious metal cobalt-based catalyst; and the preparation method has the advantages of simple process, mild reaction conditions and high hydrogenation conversion rate of benzonitrile.

Description

technical field [0001] The invention relates to a method for continuously synthesizing and preparing benzylamine by directly hydrogenating benzonitrile under normal pressure in a fixed-bed reaction device. Background technique [0002] Benzylamine is an important aromatic primary amine, an important organic chemical raw material and fine chemical intermediate. Benzylamine, also known as benzylamine, has strong basicity and can interact with phenol, formic acid, p-cresol, etc. to form addition products; it is widely used in medicine, chemical reagents, dyes, Synthetic resins, carbon dioxide absorbers, corrosion inhibitors and insecticides, etc. Among them, in medicine, it is mainly used to synthesize various drugs such as amosulalol, biotin, nialamide and sulbentine. With the development and production of more related fine chemical products, the market demand for benzylamine is gradually increasing. The production process of benzylamine in China is backward, so the develop...

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Problems solved by technology

Since the continuous hydrogenation process of benzonitrile is very complicated, and the activity of the catalyst will be significantly reduced due to the adsorption and accumulation of polymer condensation polymers on the surface of the catalyst during the use of the catalyst, and the yield of benzylamine is low, and it is rare to use continuous A report on the production of benzylamine by hydrogenation process