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Method for preparing L-glucan by utilizing lignocellulose biomass

A technology of lignocellulose and levoglucosan, which is applied in the field of levoglucosan preparation, can solve the problems of reducing the conversion rate of lignocellulosic levoglucosan and low selectivity of levoglucosan, so as to improve the utilization value , high yield and easy operation

Inactive Publication Date: 2019-09-20
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low selectivity of rapid pyrolysis of lignocellulosic biomass (such as corncobs, bagasse, straw, etc.) into levoglucosan is a key problem that limits the development of this process.
[0006] Alkali and alkaline earth metals form coordination bonds with cellulose during pyrolysis, induce homolysis of the glucose ring, and promote the formation of coke and other by-products (such as organic acids, furfural and 5-hydroxymethylfurfural, etc.), Thereby reducing the conversion rate of lignocellulose into levoglucosan

Method used

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  • Method for preparing L-glucan by utilizing lignocellulose biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: utilize pine wood to prepare the method for levoglucosan, comprise the following steps:

[0024] 1) Crushing the pine wood until the particle size is less than 80 mesh.

[0025] 2) Mix the pine wood treated in step (1) with glycerin and formic acid in a ratio of 1:10:1. Under the condition of higher ratio of liquid to solid and organic acid, it is beneficial to the dissolution of soluble matter in pine wood.

[0026] 3) The mixture obtained in step (2) was reacted at 100° C. for 3 hours. Under the above reaction conditions, 90% hemicellulose and 70% lignin in the pine wood powder were dissolved into the mixture of glycerol and organic acid, and the cellulose remained solid. At the same time, 90% of the alkali metal and ash in the pine wood powder can be dissolved into the mixed solution of glycerin and organic acid.

[0027] 4) The reaction product in step (3) was subjected to liquid-solid separation to obtain a solid product, and dried at 110° C. for 0...

Embodiment 2

[0034] Referring to Example 1, the method for preparing levoglucosan using straw stalks is different in that:

[0035] 1) Crushing the straw stalks until the particle size is less than 60 mesh.

[0036] 2) Mix the straw treated in step (1) with glycerin and acetic acid in a ratio of 1:30:5.

[0037] 3) The mixture obtained in step (2) was reacted at 200°C for 0.5 hours.

[0038] 4) The reaction product in step (3) was subjected to liquid-solid separation to obtain a solid product, and dried at 60° C. for 5 hours, and then kept at 600° C. for 1 second for rapid pyrolysis to obtain levoglucosan.

[0039] In this example, the conversion rate of cellulose into levoglucosan in the straw straw was 45%.

Embodiment 3

[0041] Referring to Example 1, the method for preparing levoglucosan using furniture processing waste sawdust as a raw material is different in that:

[0042] 1) The sawdust is further crushed to a particle size of less than 100 mesh.

[0043] 2) Mix the pine wood treated in step (1) with glycerin and organic acid in a ratio of 1:20:3; the organic acid refers to a mixture of acetic acid and oxalic acid in any ratio.

[0044] 3) React the mixture obtained in step (2) at 190° C. for 1.5 hours.

[0045] 4) The reaction product in step (3) was subjected to liquid-solid separation to obtain a solid product, and dried at 100° C. for 3 hours, and then kept at 550° C. for 2 seconds for rapid pyrolysis to obtain levoglucosan.

[0046] In this example, the conversion rate of cellulose into levoglucosan in the straw straw was 50%.

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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...

Claims

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Application Information

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IPC IPC(8): C08B37/02
CPCC08B37/0003C08B37/0024
Inventor 蒋丽群王小波赵增立李海滨郑安庆
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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