【摘 要】
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To upgrade bio-oil,two upgrading methods were employed: low temperature hydrogenation(150 oC)followed by supercritical upgrading in ethanol(HS)and direct up
【机 构】
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State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,P.R.China
【出 处】
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The 4th International Conference on Biomass Energy Technolog
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To upgrade bio-oil,two upgrading methods were employed: low temperature hydrogenation(150 oC)followed by supercritical upgrading in ethanol(HS)and direct upgrading in supercritical ethanol(DS).The physical properties(heating value,pH)of bio-oil were improved greatly by both methods.For both methods,the relative content of acids,ketones,and phenols decreased significantly while that of alcohols/ethers and esters increased dramatically after upgrading.Compared with the upgraded bio-oil from DS,the relative content of alcohols/ethers was higher in that from HS,while the relative content of ketones,phenols,and esters showed an opposite result.The reactions occurred in each reaction steps were proposed according to the GC-MS results and their effects on the properties of bio-oil were discussed.The decrease of ethanol to bio-oil ratio resulted in a sharp increase of the relative content of acids and a drop of the relative content of esters.However,the recovery of ethanol by rotary evaporation and reutilization of the recovered ethanol not only decreased the consumption of ethanol,but increased the relative content of esters in the upgraded bio-oil.These results indicated that bio-oil could be effectively upgraded at relatively low ratios of ethanol to bio-oil.
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