title: Characterization of a bio-oil from pyrolysis of rice husk by detailed compositional analysis and structural investigation of lignin.
abstract: Detailed compositional analysis of a bio-oil (BO) from pyrolysis of rice husk was carried out. The BO was extracted sequentially with n-hexane, CCl(4), CS(2), benzene and CH(2)Cl(2). 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)-CH(2)-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.
authors.affiliation: Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Lu
authors.forename: Xian-Yong
authors.initials: XY
authors.lastname: Wei
authors.forename: Jing-Pei
authors.initials: JP
authors.lastname: Cao
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Fang-Jing
authors.initials: FJ
authors.lastname: Liu
authors.forename: Yun-Peng
authors.initials: YP
authors.lastname: Zhao
authors.forename: Xing
authors.initials: X
authors.lastname: Fan
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Liang-Ce
authors.initials: LC
authors.lastname: Rong
authors.forename: Yan-Bin
authors.initials: YB
authors.lastname: Wei
authors.forename: Shou-Ze
authors.initials: SZ
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Zong
mesh_terms: D000473:Alkanes / Q000737:chemistry; D056804:Biofuels / Q000032:analysis*; D001709:Biotechnology / Q000379:methods*; D008031:Lignin / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis; D012275:Oryza / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D010938:Plant Oils / Q000032:analysis*; D013696:Temperature; D014866:Waste Products / Q000032:analysis*
chemical_list: D000473:Alkanes; D056804:Biofuels; D009930:Organic Chemicals; D010936:Plant Extracts; D010938:Plant Oils; D014866:Waste Products; D008031:Lignin; C004544:naphtha