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
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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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