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Method for preparing levoglucosan through rapid pyrolysis of coupling pretreatment biomass

A technology for pretreating biomass and levo-glucan, which is applied in the field of forestry biomass biodegradation and transformation, can solve the problems of high levo-glucan transformation, environmental pollution, and difficulty in realization, achieves high yield and improves levo-glucan. Effects of Glycan Concentration and Pyrolysis Efficiency

Active Publication Date: 2021-06-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these pretreatment processes are also difficult to achieve high conversion of levoglucosan under low concentration or low power conditions. If the treatment conditions are improved, energy consumption will increase and certain environmental pollution problems may occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The pine and 3% lye solution were mixed with a solid-to-liquid ratio of 1:15 (w / v) and pretreated at 50°C for 4 hours, followed by solid-liquid separation, and the filter residue was washed continuously with deionized water until neutral.

[0034] Fenton pretreatment is carried out on the filter residue after lye pretreatment, the solid-liquid ratio is 1:15 (w / v), and the Fenton solution is 16mMFeSO 4 and 5 mL / g 30% H 2 o 2 , the pretreatment was carried out at pH 3.0. React at 90rpm for 24h at room temperature. Afterwards, the lye-Fenton pretreated filter residue was collected by filtration, washed with deionized water until neutral, and dried at 105° C. for 12 h.

[0035] The pretreated raw material is rapidly pyrolyzed in a fixed bed, the feed amount is 1g, the pyrolysis temperature is 500°C, and the pyrolysis gas velocity is 450mL / min. The pyrolysis bio-oil is collected by at least two continuous condenser tubes, and the collection temperature is At zero tempera...

Embodiment 2

[0037] Compared with Example 1, the only difference is that the biomass is poplar, and the calculated yield of levoglucosan is 121.1 mg / g.

Embodiment 3

[0039] Compared with Example 1, the difference is only that the biomass is rice straw, and the calculated levoglucosan yield is 201.9mg / g, which produces a higher levoglucosan yield (177mg / g).

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Abstract

The invention provides a method for preparing levoglucosan through rapid pyrolysis of coupling pretreatment biomass, which comprises the following steps: mixing a biomass raw material with alkali liquor, and carrying out alkali pretreatment to obtain an alkali pretreatment product; carrying out solid-liquid separation on the alkali pretreatment product to obtain solid filter residues, mixing the solid filter residues with a Fenton reagent, and carrying out Fenton pretreatment to obtain a Fenton pretreatment product; carrying out solid-liquid separation on the Fenton pretreatment product to obtain filter residues, washing the filter residues to be neutral, and drying the filter residues to obtain a coupling pretreatment product; and quickly pyrolyzing the coupling pretreatment product, and condensing and pyrolyzing the volatile product to obtain bio-oil containing levodextran. According to the method disclosed by the invention, alkali liquor pretreatment is firstly carried out to mainly remove a large amount of lignin in the biomass, then Fenton pretreatment is carried out to mainly break cellulose and hemicellulose as well as glucosidic bonds between the cellulose and degrade part of hemicellulose, and finally a porous short-chain cellulose enriched substrate is formed, so that higher levoglucosan yield can be achieved.

Description

technical field [0001] The invention belongs to the technical field of biodegradation and conversion of forestry biomass, and in particular relates to a method for preparing levoglucosan by fast pyrolysis of coupled pretreated biomass. Background technique [0002] As a renewable resource, biomass can produce high-value chemicals and liquid fuels through a variety of technologies, such as fast pyrolysis, enzymatic hydrolysis, gasification and liquefaction, etc. Among these technologies, fast pyrolysis technology can convert biomass into chemicals such as levoglucosan in a relatively short period of time. At present, levoglucosan is mainly derived from the fast pyrolysis of cellulose, and it can be extracted from pyrolysis bio-oil by various separation methods, such as solvent extraction, molecular distillation and membrane filtration, etc. In addition, it can also be directly converted into liquid fuel. High-purity levoglucosan costs about $100 / gram (Sigma Company), and is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/02
CPCC08B37/0024C08B37/0003
Inventor 张会岩吴凯肖睿储升
Owner SOUTHEAST UNIV
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