Nickel/copper catalyst and preparation method thereof, and method for directly preparing 1,2-hexanediol from cellulosan by using nickel/copper catalyst

Abstract

The invention relates to a supported nickel / copper catalyst and a preparation method thereof, and a method for preparing 1,2-hexanediol from cellulosan by using the supported nickel / copper catalyst. The weight ratio of nickel to copper in the catalyst is between 1:10 and 10:1. Based on the total weight of the catalyst, the carrying capacity of the nickel is 0.05 to 40 percent, and the carrying capacity of the copper is 0.05 to 50 percent; meanwhile, the preparation process for the catalyst is simple; and the method for preparing 1,2-hexanediol from cellulosan by using the catalyst can be used for highly selectively preparing 1,2-hexanediol, and compared with conventional hexylene routes, the method has significant advantages of reproducible raw materials, environment-friendly reaction process and the like.

Description

technical field [0001] The invention belongs to the technical field of green chemical industry, and in particular relates to a nickel / copper catalyst, a preparation method thereof and a method for directly preparing 1,2-hexanediol from cellopolysaccharide using the catalyst. Background technique [0002] 1,2-Hexanediol is an important fine chemical product, which is widely used in industries such as pharmaceuticals, textiles, pesticides, cosmetics, advanced inks and polymer materials. And the preparation method of 1,2-hexanediol mainly is to use the method of organic synthesis at present, for example discloses in the Chinese patent application of publication number CN1465556A with formic acid, 1-butene, hydrogen peroxide etc. mix with certain ratio, in 35- Stir and reflux at 40°C, react for 20-25 hours, and extract and rectify to obtain 1,2-hexanediol. Although the above method obtains 1,2-hexanediol with higher purity, the synthetic route is complicated, and formic acid ne...

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Problems solved by technology

And prepare 1,2,6-hexanetriol yield by 5-hydroxymethylfurfural less than 30%, and need to use noble metal catalysts such as rhodium rhenium [Teddy Buntara, Sebastien Noel, Pim Huat Phua, Ignacio Melin-Cabrera, Johannes G. de Vries, *and Hero J. Heeres*, Caprolactam from Renewable Resources: Catalytic Conversion of 5-Hydroxymethylfurfural into Caprolactone]

The yield of 1,2-hexanediol from 1,2,6-hexanetriol is less than 35% [Teddy Buntara, Sebastien Noel, Pim Huat Phua, Ignacio Melia'n-Cabrera, Johannes G. de Vries, Hero J. Heeres,From 5-Hydroxymethylfurfural(HMF)to Polymer Precursors:Catalyst Screening Studies on the Conversion of1,2,6-hexanetriol to 1,6-hexanediol]

From the above, it can be seen that the current method for preparing 1,2-hexanediol from biomass is too cumbersome, the process is complicated, and the total yield is low

[0004] Although diols or polyols can be produced through the processing of glucose, and glucose can also be obtained by hydrolysis of cellulose, the crystal structure of natural cellulose determines that the rate of enzyme-catalyzed reaction must be very slow, so it usually needs to go through one step in advance. Cellulose can be efficiently utilized by enzymes only after the treatment destroys the crystal structure [He Beihai, Lin Lu, Sun Runcang, Sun Yong, Chemical Hydrolysis of Lignocellulose to Produce Fermentable Sugars, Advances in Chemistry, 2007, 19 (7-8), 1141- 1146], and after hydrolysis, glucose has to be separated from the aqueous solution to be utilized by the hydrogenolysis process

This has led to a very complicated production process from cellulose as raw material to diol or polyol products, and the addition of acid and alkali, serious environmental pollution, and increased operating costs

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