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《Journal of South China University of Technology(Natural Science Edition)》 2011-01
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Production of Phenolic Chemicals via Liquefaction of Alkali Lignin from Bagasse

Sui Xin-jin1 Wu Shu-bin1,2(1.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Key Laboratory of Renewable Energy and Gas Hydrate,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China)  
In order to increase the utilization value of alkali lignin from bagasse,aluminium silicate was chosen as the catalyst to produce phenolic chemicals from the lignin via a liquefaction process.The reaction conditions including aluminium silicate dosage,heating time,heating temperature and liquid-solid(glycerol-bagasse alkali lignin) ratio were then optimized as follows: an aluminium silicate dosage of 4%(based on the dry bagasse alkali lignin),a heating duration of 1 h,a heating temperature of 270℃ and a liquid-solid ratio of 6 mL/g(based on the dry bagasse alkali lignin).In these conditions,phenolic chemicals mainly containing 2,6-dimethoxy-phenol,2-methoxy-phenol and phenol were produced,with a total yield of 54.10%.Moreover,the structures of functional groups of the alkali lignin before and after the liquefaction were analyzed by means of FT-IR and 1H NMR.The results show that,when the heating temperature reaches 270 ℃,the propane units of the phenylpropane separate from benzene units in the presence of aluminium silicate,and the β-ether lingkages(β-O-4) break due to high temperature and the existence of acid.At the same time,few α-ether lingkages(α-O-4) break to produce phenols following the separation of propane units.
【Fund】: 国家“973”计划项目(2007CB210201);; 国家“863”计划项目(2007AA05Z456);; 中国科学院可再生能源与天然气水合物重点实验室开放基金资助项目(0807K1)
【CateGory Index】: TK6
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