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Method for preparing levoglucosan by coupling pretreated biomass with fast pyrolysis

A technology for pretreatment of biomass and levoglucosan, which is applied in the field of forestry biomass biodegradation and transformation, can solve the problems of environmental pollution, high levoglucosan conversion, increased energy consumption, etc., and achieves the improvement of levoglucosan concentration And the effect of pyrolysis efficiency and high yield

Active Publication Date: 2022-04-29
SOUTHEAST UNIV
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  • Description
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  • Application Information

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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 by rapid pyrolysis of coupled pretreatment biomass, comprising: mixing biomass raw materials with alkali solution, performing alkali pretreatment to obtain alkali pretreatment products; solidifying the alkali pretreatment products liquid separation to obtain a solid filter residue, mix the solid filter residue with Fenton's reagent, and perform Fenton pretreatment to obtain a Fenton pretreated product; perform solid-liquid separation on the Fenton pretreated product to obtain a filter residue, wash the filter residue with water until neutral, The coupling pretreatment product is obtained after drying; the coupling pretreatment product is quickly pyrolyzed, and the pyrolysis volatile product is condensed to obtain bio-oil containing levoglucosan. The method of the present invention firstly carries out lye pretreatment, mainly removes a large amount of lignin in biomass, and then carries out Fenton pretreatment, mainly interrupts cellulose and hemicellulose, and the glucosidic bond between cellulose and cellulose, Degrading part of the hemicellulose and finally forming a porous short-chain cellulose-rich substrate can result in a higher yield of levoglucosan.

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 Patents(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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