A kind of method for preparing L-glucosone by catalytic pyrolysis of biomass

Abstract

The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing L-glucosone by catalytic pyrolysis of biomass. The invention uses biomass-based phosphoric acid-activated activated carbon as a catalyst, and through mechanical mixing with biomass, rapid pyrolysis is carried out at 250-470°C under inert and oxygen-free conditions, and rich L-glucose can be obtained after condensing the pyrolysis gas The liquid product of ketones. Biomass-based phosphoric acid activated activated carbon catalytic pyrolysis of biomass pyrolysis products, the yield and purity of glucosone are high; in addition, the mixture of solid coke and catalyst generated by pyrolysis can be used as a carbon source to continue to prepare activated carbon ; By using low-cost and reusable biomass-based phosphoric acid-activated activated carbon, the production cost and pollution can be effectively reduced, and it is an economical and effective method for preparing L-glucosone.

Description

technical field [0001] The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing L-glucosone by catalytic pyrolysis of biomass. Background technique [0002] Levoglucosone (LGO, 1,6-anhydro-3,4-dideoxy-β-D-pyranosen-2-one) is produced by dehydration of cellulose and part of hemicellulose during biomass pyrolysis. An important anhydrosugar derivative formed; it has high reactivity, is an important raw material for organic synthesis, and has high application value. [0003] It has been more than 40 years since L-glucosone was first discovered in 1973. However, due to its low yield and difficult purification in the conventional pyrolysis process of biomass, the market price is high, which limits its application in organic synthesis. Previous studies have proved that in the pyrolysis process of cellulose or biomass, the introduction of a suitable acid catalyst can significantly promote the formation of glucosone. Th...

AI Technical Summary

Problems solved by technology

However, among the above-mentioned catalysts, catalysts such as liquid acids need to be loaded onto cellulose or biomass raw materials through cumbersome pretreatment processes; and ionic liquids are not only expensive but also have poor thermal stability.

More importantly, the above-mentioned acid catalysts all have very strong acidity. During the pyrolysis process, due to the existence of water vapor, the acid sites are prone to be lost and enter into the pyrolysis liquid product to promote the formation of levoglucosone in the form of catalyst. Secondary reactions in the pyrolysis liquid, making it difficult for levoglucosone to exist stably

In addition, after the catalytic pyrolysis reaction, the catalyst and coke are mixed together, the catalyst is difficult to recycle, and it also affects the use of coke

And the massive use of these strongly acidic catalysts also easily causes problems such as environmental pollution.