Method for one-step synthesis of diamino decalin by catalytic hydrogenation of dinitro naphthalene

Abstract

The invention relates to a method for one-step synthesis of diamino decalin by catalytic hydrogenation of dinitro naphthalene. The method is characterized in that a non-noble transition metal, namely nickel with catalytic activity is impregnated to different oxides and zeolite molecular sieve frameworks with different bore diameters and different structures in a certain loading ratio through an impregnation method under the situation of ultrasonic assisted vibration to prepare a nickel-loaded oxide or zeolite molecular sieve hydrogenation catalyst; and in a pressure reaction kettle, the load type nickel-based hydrogenation catalyst, dinitro naphthalene and a solvent are added, hydrogen is charged and heated to a certain reaction temperature, and the reaction is performed for a certain period of time for performing catalytic hydrogenation on dinitro naphthalene so as to realize the one-step synthesis of diamino decalin. According to the method disclosed by the invention, the conversion rate of dinitro naphthalene can be significantly improved; and simultaneously, the catalyst has the advantages of low cost, simplicity and convenience in preparation and long service life, and further shows great application prospects.

Description

technical field [0001] The invention relates to a method for synthesizing diaminodecalin in one step by catalytic hydrogenation of dinitronaphthalene, in particular to a method for synthesizing diaminodecalin in one step by catalytic hydrogenation of dinitronaphthalene with a supported nickel-based hydrogenation catalyst. Background technique [0002] Hydrogenation of aromatic nitro compounds is a very important unit reaction in dyestuff, medicine and fragrance industry. There have been some reports on the use of homogeneous catalysts to catalyze this reaction, however, these homogeneous catalysts are unstable in air and are not easy to separate and recover from the reactants. In recent years, the use of supported palladium, platinum, rhodium catalysts and Raney nickel catalysts for the hydrogenation of aromatic nitro compounds to aromatic amines has attracted people's attention. The catalysts used are mainly oxides, polymers and activated carbon supported noble metal catal...

AI Technical Summary

Problems solved by technology

But the active temperature of the nickel-aluminum system catalyst used in industry is narrow (generally 130-180 ℃), even under the best conditions, the yield of the target product cyclohexylamine that can be obtained also only has 30-50%, and Accompanied by a large number of side reaction products, such as dicyclohexylamine, N-cyclohexylaniline, benzene and ammonia, in addition to unconverted aniline, these disadvantages are generally considered to be largely due to the higher nickel content, which in the support Accumulated on the surface, the degree of dispersion is not high, resulting in low effective utilization of nickel

However, the research and application of the one-step synthesis of diaminodecalin by catalytic hydrogenation of dinitronaphthalene at home and abroad are still rarely reported.