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Method for rapidly extracting waste biomass lignin by microwave method and recycling waste biomass lignin

A waste biomass and lignin technology, applied in the fields of environmental protection and resource comprehensive utilization, can solve the problems of limiting depolymerization and transformation, achieve huge economic benefits, efficient wood separation and extraction methods, simple process and effective effect

Active Publication Date: 2021-12-24
FUDAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although this method can obtain a higher yield of lignin, its structure is significantly changed compared with the natural structure of the starting lignin, mainly because the harsh extraction process leads to the breakage of a large number of β-O-4 bonds and C-C in the natural lignin structure. Formation of bonded polymeric structures that limit their subsequent depolymerization into phenolic chemicals

Method used

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  • Method for rapidly extracting waste biomass lignin by microwave method and recycling waste biomass lignin
  • Method for rapidly extracting waste biomass lignin by microwave method and recycling waste biomass lignin
  • Method for rapidly extracting waste biomass lignin by microwave method and recycling waste biomass lignin

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Experimental program
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Effect test

Embodiment 1

[0028] Put 5g of poplar biomass, 25g of water and 25g of ethanol in a 100mL polytetrafluoroethylene microwave reactor, add 0.1% sulfuric acid catalyst, mix to obtain a mixture, and set the microwave heating power to 900W. The mixture was reacted at 160°C for 60 minutes. After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. After filtering, 3 times the volume of water was added to the filtrate. The lignin was precipitated, collected by centrifugation, and dried in vacuum at 50°C to obtain lignin. The yield of lignin relative to poplar biomass was 10%. The filtrate contains small molecular carbohydrates, mainly including xylose and furfural, with a total yield of 15% relative to poplar biomass, and a residual solid carbon yield of 48%. The obtained lignin was subjected to microwave-assisted alkali-catalyzed conversion, and the qualitative and quantitative analysis of phenolic monomers was carried out by GC-MS and GC-FID. The...

Embodiment 2

[0030] Put 5g of corncob biomass, 25g of water and 25g of ethanol in a 100mL polytetrafluoroethylene microwave reactor, add 0.1% sulfuric acid catalyst, mix to obtain a mixture, and set the microwave heating power to 900W. The mixture was reacted at 120°C for 60 minutes. After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. After filtering, 3 times the volume of water was added to the filtrate. The lignin was precipitated, collected by centrifugation, and dried in vacuum at 50°C to obtain lignin. The yield of lignin relative to corn cob biomass was 5%. The filtrate contains small molecular carbohydrates, mainly including xylose, furfural and glucose, with a total yield of 23% relative to the biomass and a 43% yield of residual solid charcoal. The obtained lignin was subjected to microwave-assisted alkali-catalyzed conversion, and the qualitative and quantitative analysis of phenolic monomers was carried out by GC-MS and GC...

Embodiment 3

[0032] 2g of bamboo biomass, 25g of water and 25g of ethanol were placed in a 100mL polytetrafluoroethylene reactor, and 0.1wt% sulfuric acid catalyst was added. Mix to obtain a mixture, and set the microwave heating power to 1200W. The mixture was reacted at 160°C for 10 minutes. After the reaction was completed, it was cooled to room temperature, and the reaction solution was filtered. After filtering, 3 times the volume of water was added to the filtrate. The lignin was precipitated, collected by centrifugation, and dried in vacuum at 50°C to obtain lignin. The yield of lignin relative to corncob biomass was 13%. The filtrate contains small molecular carbohydrates, mainly including xylose and furfural, with a total yield of 14% relative to the biomass and a 50% yield of the remaining solid residue charcoal. The obtained lignin was subjected to microwave-assisted base-catalyzed conversion, and the qualitative and quantitative analysis of phenolic monomers was carried out by...

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Abstract

The invention relates to a method for rapidly extracting waste biomass lignin by a microwave method and recycling the waste biomass lignin, which comprises the following steps: rapidly separating and extracting lignin from different biomasses and acid catalysts under microwave water / solvothermal conditions, and obtaining small molecular carbohydrates and solid residue carbon products. The extracted lignin is subjected to a subsequent microwave-assisted hydrothermal base catalytic reaction to obtain high-yield bio-oil and phenolic monomers. According to the process, resource utilization of all components of the waste organisms can be achieved, a faster and more efficient conversion way is provided for extraction of high-quality lignin and preparation of high-added-value chemicals, the promotion effect on reduction of environmental pollution and development of the biological refining industry is achieved, and huge economic benefits, social benefits and ecological benefits can be generated.

Description

technical field [0001] The invention belongs to the fields of environmental protection and comprehensive utilization of resources, and in particular relates to a method for rapidly extracting waste biomass lignin by a microwave method and utilizing it as a resource. The invention uses waste biomass as raw material to quickly extract high-quality wood and biomass multi-component resource utilization technology, specifically involves microwave water / solvent heat treatment of biomass under the conditions of a certain temperature, an acid catalyst and an organic co-solvent to obtain A method for high-quality lignin, small-molecule carbohydrates, and solid slag char. The process uses renewable resource biomass as raw material, the reaction process is fast and the reaction conditions are mild, and it provides a new and sustainable method for the efficient separation and extraction of lignin and the utilization of biomass components. Background technique [0002] The resource util...

Claims

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Application Information

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IPC IPC(8): C07G1/00C01B32/05C07D307/50C13K1/02C13K13/00
CPCC07G1/00C07D307/50C13K13/002C13K1/02C01B32/05Y02E50/10
Inventor 张士成曹阳高洁
Owner FUDAN UNIV
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