Catalyst for preparing pentanediol from biomass, and preparation method and application thereof

Abstract

The invention relates to a supported platinum-cobalt catalyst and a preparation method thereof, and a method for producing pentanediol from biomass and biomass derivatives by using the supported catalyst. In the supported platinum-cobalt catalyst, different contents of platinum and cobalt are loaded on a carrier, and a weight ratio of platinum to cobalt is in a range of 1: 20 and 10: 1; and the carrier may be at least one selected from the group consisting of an acidic molecular sieve, activated carbon, ZrO2, Nb2O5 and Al2O3. The preparation method for catalyst is simple in process. The methodfor preparing pentanediol from biomass and the derivatives thereof by using the catalyst can realize high-selectivity preparation of 1,2-pentanediol or 1,5-pentanediol. Compared with traditional routes, the method provided by the invention has the obvious advantages of renewability of raw materials green, reaction process and the like, and has good application prospects.

Description

technical field [0001] The invention relates to a catalyst for preparing fine chemical pentanediol by catalyzing the hydrogenation of biomass and its preparation method, in particular to a multi-active component catalyst, which can effectively catalyze the selective hydrogenation of biomass and its derivatives Preparation of 1,2-pentanediol and 1,5-pentanediol. Background technique [0002] 1,2-pentanediol and 1,5-pentanediol are important chemical raw materials. 1,2-pentanediol is the key intermediate of the fungicide propiconazole. In recent years, with the gradual promotion of the application of this fungicide, the demand for 1,2-pentanediol has increased year by year. At the same time, 1,2-pentanediol is an excellent cosmetic additive. As a cosmetic additive, 1,2-pentanediol has many advantages such as moisturizing, lubricating, antibacterial, antiseptic, and good biocompatibility. 1,5-Pentanediol is a widely used chemical product, which can be used alone or as a chem...

AI Technical Summary

Problems solved by technology

U.S. Patent US4479021 discloses to use n-pentene, formic acid and hydrogen peroxide as raw materials to prepare 1,2-pentanediol, but peracetic acid will be produced during the operation, which has certain safety risks. Chinese patent CN1552684A also utilizes a similar Method; U.S. Patent No. 4,605,795 discloses that in a benzene solvent, pentene and perpropionic acid are epoxidized to obtain 1-pentene oxide, and then saponified to obtain 1,2-pentanediol process, but the solvent is more polluting to the environment

[0004] The synthesis method of 1,5-pentanediol mainly includes: (1) Using tetrahydrofurfuryl alcohol as a raw material to directly hydrogenate ring-opening to prepare 1,5-pentanediol, the pressure range is 8MPa-42MPa, the temperature is 120°C-330°C, This method has high reaction temperature, large equipment investment, and high difficulty in operation; (2) cyclopentadiene is photooxidized to prepare epoxypentenol, and then hydrogenated at 70-100 ° C and about 6 MPa pressure to prepare 1,5 -pentanediol, but the photooxidative preparation efficiency of cyclopentadiene is low, so that the economy is not high; (3) first adopt glutaric acid as raw material to prepare 1,5-methyl glutarate, and then act on copper-zinc-aluminum catalyst 1,5-pentanediol is prepared by hydrogenation at 150-350°C and 3-5MPa, the conversion rate is greater than 95%, and the selectivity of 1,5-pentanediol is greater than 95% (Chinese patent CN1565728), but the process flow It is relatively long, and the cost of glutaric acid is relatively high; (4) react with substituted vinylacetaldehyde and substituted propenyl alcohol to generate substituted 3,4-dihydropyran, and then prepare glutaraldehyde through catalytic hydrolysis, Substituting pentanediol (Chinese patent CNI072168A, the catalyst adopts Raney nickel, modified Raney nickel, loaded platinum, palladium or nickel alumina after hydrogenation

This method has a long technical route and high cost

(5) Using Ru as the active component supported catalyst, using 1,5-glutaraldehyde as raw material, under relatively mild reaction conditions, 60-120°C, 2MPa-8MPa, hydrogenation to prepare 1,5-pentanedialdehyde Alcohol, high conversion and selectivity, but the cost of raw materials used in this technology is relatively high

[0005] In summary, in the method for preparing pentylene glycol, there are problems such as non-renewable petroleum resources, relatively harsh reaction conditions, and discharge of three wastes.