Lignin only accounts for about 6%of total mass in tobacco stem,but it inuences the harmful substances in the side stream smoke of cigarette in a significant way.Traditional researches focus only on the determination o...Lignin only accounts for about 6%of total mass in tobacco stem,but it inuences the harmful substances in the side stream smoke of cigarette in a significant way.Traditional researches focus only on the determination of lignin content.In the present work,we investigate four typical imidazolium-based ionic liquids for efficient extraction of lignin under mild conditions and 1-ethyl-3-methylimidazolium diethylphosphate([Emim][DEP])shows the best results.The pretreatment of stem using water at 80℃for 30 min can not only remove most of the sugars but also loose the microbers.The extractive rate of lignin reaches 85.38%at 150℃for 4 h and the purity of lignin is 90.21%.展开更多
Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly coval...Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly covalent structure and strong intra and in- ter-molecular hydrogen bonding in lignoceUulose make it high recalcitrance to transformation due to the poor solubility in wa- ter or common organic solvents. Dissolution and transformation of lignocellulose and its constituents in ionic liquids have therefore attracted much attention recently due to the tunable physical-chemical properties. Here, ionic liquids with excellent dissolving capability for biomass and its ingredients were examined. The technologies for lignocellulose biorefining in the presence of ionic liquid solvents or catalysts were also summarized. Some pertinent suggestions for the future catalytic conver- sion and unitization of this sustained carbon-rich resource are proposed.展开更多
基金supported by the China Postdoctoral Science Foundation (BH2060000062)China Tobacco Anhui Industrial Co.,LTD
文摘Lignin only accounts for about 6%of total mass in tobacco stem,but it inuences the harmful substances in the side stream smoke of cigarette in a significant way.Traditional researches focus only on the determination of lignin content.In the present work,we investigate four typical imidazolium-based ionic liquids for efficient extraction of lignin under mild conditions and 1-ethyl-3-methylimidazolium diethylphosphate([Emim][DEP])shows the best results.The pretreatment of stem using water at 80℃for 30 min can not only remove most of the sugars but also loose the microbers.The extractive rate of lignin reaches 85.38%at 150℃for 4 h and the purity of lignin is 90.21%.
基金financial support of the National Natural Science Foundation of China (20876055, 21076085)the Natural Science Foundation of Guangdong Province (S2011020001472)the Fundamental Research Funds for the Central Universities, SCUT
文摘Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly covalent structure and strong intra and in- ter-molecular hydrogen bonding in lignoceUulose make it high recalcitrance to transformation due to the poor solubility in wa- ter or common organic solvents. Dissolution and transformation of lignocellulose and its constituents in ionic liquids have therefore attracted much attention recently due to the tunable physical-chemical properties. Here, ionic liquids with excellent dissolving capability for biomass and its ingredients were examined. The technologies for lignocellulose biorefining in the presence of ionic liquid solvents or catalysts were also summarized. Some pertinent suggestions for the future catalytic conver- sion and unitization of this sustained carbon-rich resource are proposed.
