Loaded nickel-base bi-component catalyst and application thereof

Abstract

The invention discloses a loaded nickel-base bi-component catalyst and an application thereof. The catalyst is prepared by the following steps of: (1) firstly immersing a carrier with a soluble nickel salt solution by adopting an isovolumetric immersion method, then drying and roasting, wherein the carrier is gamma-aluminium oxide, silicon dioxide, molecular sieve or activated carbon; and (2) immersing the product obtained by the step (1) with a soluble transitional metal salt solution of another transitional metal by adopting the isovolumetric immersion method, drying and roasting again, thus the loaded nickel-base bi-component catalyst is obtained, wherein the transitional metal is selected from Fe, Co, Cr, Cu, Zn, Pt, Pd, Ru, Au and Ag. The loaded nickel-base bi-component catalyst disclosed by the invention is applied to preparation of high purity 3-dimethyl amino propylamine by catalytic hydrogenation on 3-dimethyl amino propionitrile, the reaction selectivity is high, and the catalyst can be reused, thus the catalyst is suitable for industrial application.

Description

(1) Technical field [0001] The invention relates to a catalyst for preparing 3-dimethylaminopropylamine by catalytic hydrogenation of 3-dimethylaminopropionitrile and an application method thereof. (2) Background technology [0002] 3-Dimethylaminopropylamine (DMAPA) is an important chemical intermediate widely used in the production of surfactants, flocculants, gasoline and engine oil additives, etc. At present, the catalytic hydrogenation of fatty nitriles (3-dimethylaminopropionitrile, DMAPN) to the corresponding fatty primary amines (DMAPA) is commonly used in industry, and alkaline substances are used to suppress the formation of secondary and tertiary amines. The biggest problem in this catalytic hydrogenation process is the reaction selectivity, which is because the primary amine produced by the reaction will undergo addition side reaction with the intermediate product imine, and then generate secondary and tertiary amines. Also can generate by product N in the react...

AI Technical Summary

Problems solved by technology

Raney nickel catalysts show excellent catalytic performance in the reaction, but bring new problems when alkali metal hydroxides such as sodium hydroxide are used as secondary amine inhibitors. This is because the Raney nickel catalyst will partially dissolve In the sodium hydroxide solution, the deactivation of the catalyst is accelerated, and more seriously, the dissolution of the catalyst will cause a small amount of nickel ions to enter the 3-dimethylaminopropylamine product, which reduces the quality of the product and limits its application in high-end fields