Hydrothermal conversion of lignocellulosic biomass to bio-oils

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dc.contributor.author Gan, Jing
dc.date.accessioned 2012-04-30T19:46:29Z
dc.date.available 2012-04-30T19:46:29Z
dc.date.issued 2012-04-30
dc.identifier.uri http://hdl.handle.net/2097/13768
dc.description.abstract Corncobs were used as the feedstock to investigate the effect of operating conditions and crude glycerol (solvent) on bio-oil production. The highest bio-oil yield of 33.8% on the basis of biomass dry weight was obtained at 305°C, 20 min retention time, 10% biomass content, 0.5% catalyst loading. At selected conditions, bio-oil yield based on the total weight of corn cobs and crude glycerol increased to 36.3% as the crude glycerol/corn cobs ratio increased to 5. Furthermore, the optimization of operating conditions was conducted via response surface methodology. A maximum bio-oil yield of 41.3% was obtained at 280°C, 12min, 21% biomass content, and 1.56% catalyst loading. A highest bio-oil carbon content of 74.8% was produced at 340°C with 9% biomass content. A maximum carbon recovery of 25.2% was observed at 280°C, 12min, 21% biomass content, and 1.03% catalyst loading. The effect of biomass ecotype and planting location on bio-oil production were studied on big bluestems. Significant differences were found in the yield and elemental composition of bio-oils produced from big bluestem of different ecotypes and/or planting locations. Generally, the IL ecotype and the Carbondale, IL and Manhattan, KS planting locations gave higher bio-oil yield, which can be attributed to the higher total cellulose and hemicellulose content and/or the higher carbon but lower oxygen contents in these feedstocks. Bio-oil from the IL ecotype also had the highest carbon and lowest oxygen contents, which were not affected by the planting location. In order to better understand the mechanisms of hydrothermal conversion, the interaction effects between cellulose, hemicellulose and lignin in hydrothermal conversion were studied. Positive interaction between cellulose and lignin, but negative interaction between cellulose and hemicellulose were observed. No significant interaction was found between hemicelluose and lignin. Hydrothermal conversion of corncobs, big bluestems, switchgrass, cherry, pecan, pine, hazelnut shell, and their model biomass also were conducted. Bio-oil yield increased as real biomass cellulose and hemicellulose content increased, but an opposite trend was observed for low lignin content model biomass. en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Hydrothermal conversion en_US
dc.subject Lignocellulosic biomass en_US
dc.subject Bio-oil en_US
dc.subject Corn cob en_US
dc.subject Big bluestem en_US
dc.title Hydrothermal conversion of lignocellulosic biomass to bio-oils en_US
dc.type Dissertation en_US
dc.description.degree Doctor of Philosophy en_US
dc.description.level Doctoral en_US
dc.description.department Department of Biological and Agricultural Engineering en_US
dc.description.advisor Wenqiao Yuan en_US
dc.description.advisor Donghai Wang en_US
dc.subject.umi Energy (0791) en_US
dc.subject.umi Engineering, Agricultural (0539) en_US
dc.date.published 2012 en_US
dc.date.graduationmonth May en_US


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