Method for preparing L-glucan by utilizing lignocellulose biomass

Abstract

The invention discloses a method for preparing L-glucan by utilizing lignocellulose biomass. The method comprises the following steps: crushing lignocellulose biomass, mixing the lignocellulose biomass with glycerol and organic acid amine, carrying out a reaction at 100-200 DEG C for 0.5-3 hours, carrying out liquid-solid separation on the reaction product, drying the solid product at 60-110 DEG C for 0.5-5 hours, and treating the product at 300-600 DEG C for 1-2 seconds for quick pyrolysis, thereby obtaining the L-glucan. According to the method, the raw material source is wide, the lignocellulose biomass with low price is used as the raw material, and the lignin, the hemicellulose, the cellulose and the alkali metal are synchronously separated by adopting the mixed solvent of the glycerol and the organic acid to prepare the L-glucan with high additional value; the method is high in yield, and the utilization value of forestry and agricultural residues is improved; meanwhile, the content of acid in cellulose is adjusted by controlling the drying temperature and time, water washing is unnecessary and generation of waste water is avoided.

Description

[0001] Technical field:

[0002] The invention relates to a method for preparing levoglucosan from lignocellulosic biomass.

[0003] Background technique:

[0004] Cellulose undergoes rapid pyrolysis at around 500°C in a very short time (about 2 seconds), producing levoglucosan (1,6-anhydro-β-D-glucopyranose). Levoglucosan is an important monomer for the synthesis of stereo compounds, and can be used as a chiral synthon to synthesize oligosaccharides, polymers, resins, drugs and related products. Microorganisms can directly or indirectly use levoglucosan as a substrate to produce itaconic acid, citric acid, lipids and ethanol.

[0005] At present, a large amount of agricultural and forestry wastes (such as corncobs, bagasse, etc.) are mainly discarded and incinerated, with low utilization value. Agricultural and forestry waste belongs to lignocellulosic biomass, which can theoretically be converted into high-value levoglucosan. However, lignocellulosic biomass contains a lot...

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