Method for preparing alcohols by selectively hydrogenating aldehydes

Abstract

The invention relates to a method for preparing alcohols by selectively hydrogenating aldehydes, belonging to hydrogenation technologies. In order to meet the requirements of people on two aspects, i.e. the improving of the selectivity on preparing the alcohols by hydrogenating the aldehydes and the prolonging of the service life of a catalyst currently, the method proposes that: the aldehydes are taken as raw materials; the reaction temperature is 20-300 DEG C; the reaction pressure is 0.1-7.0 MPa; the weight space velocity of the aldehydes is 0.02-20 h<-1>; the aldehydes and hydrogen gas are in contact with a hydrogenation catalyst; and the aldehydes are produced into corresponding alcohols through selectively hydrogenating. In the method, the hydrogenation catalyst comprises a carrier, a metal active component and silane groups; the silane groups are grafted through a silylanizing treatment; and the content of the silane groups in the total weight of the catalyst is 0.05 wt% to 25 wt%. Compared with the existing method, with the adoption of the catalyst in the method provided by the invention, the selectivity is high, the amount of byproducts, such as ethers, esters and acetals is greatly lowered; and meanwhile, the generation amount of carbon deposit is little, so that the catalyst has longer service life.

Description

technical field

[0001] This paper relates to a method for preparing alcohol by hydrogenation of aldehyde and its application. Background technique

[0002] The hydrogenation of aldehydes is an important method for the preparation of monoalcohols and polyols in industry. As a long-developed industry, the source of hydrogen atoms is hydrogen or reducing substances containing hydrogen atoms (such as formic acid, alcohol, hydrazine hydrate, etc.). The former is the mainstream method for hydrogenation of aldehydes, which is mainly used for large-scale production of alcohols and requires the use of metal catalysts, while the latter is often used in small-scale synthesis of medicines and organic intermediates, using metal catalysts or basic catalysts . For the case of hydrogen as a hydrogen source, there are many types of metal catalysts used, and its active components include copper, nickel, cobalt and noble metals platinum, ruthenium, palladium, etc. Among them, copper-based ca...

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