Journal
BIORESOURCE TECHNOLOGY
Volume 116, Issue -, Pages 114-119Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.04.006
Keywords
Rice husk; Pyrolysis; Compositional analysis; Sequential extraction; Lignin
Funding
- Natural Science Foundation of China for Innovative Research Group [50921002]
- Major State Basic Research Development Program of China [2012CB215302]
- Jiangsu Provincial Natural Science Foundation [BK2011225]
- Program of the University in Jiangsu Province for Graduate Student's Innovation in Science Research [CXZZ11_0302]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Fundamental Research Funds for the Central Universities (China University of Mining Technology) [2011QNA22, 2011QNA23]
- China Postdoctoral Science Foundation [2011M500975]
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Detailed compositional analysis of a bio-oil (BO) from pyrolysis of rice husk was carried out. The BO was extracted sequentially with n-hexane, CCl4, CS2, benzene and CH2Cl2. In total, 167 organic species were identified with GC/MS in the extracts and classified into alkanes, alcohols, hydroxybenzenes, alkoxybenzenes, dioxolanes, aldehydes, ketones, carboxylic acids, esters, nitrogen-containing organic compounds and other species. The benzene ring-containing species (BRCCs) were attributed to the degradation of lignin while most of the rests were derived from the degradation of cellulose and hemicellulose. Along with guaiacyl and p-hydroxyphenyl units as the main components, a new type of linkage was suggested, i.e.. C-ar-CH2-C-ar in 4,4'-methylenebis(2,6-dimethoxyphenol). Based on the species identified, a possible macromolecular structure of the lignin and the mechanism for its pyrolysis are proposed. The BO was also extracted with petroleum ether in ca. 17.8% of the extract yield and about 82.1% of the extracted components are BRCCs. (C) 2012 Elsevier Ltd. All rights reserved.
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