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  • Title: Characterization of a bio-oil from pyrolysis of rice husk by detailed compositional analysis and structural investigation of lignin.
    Author: Lu Y, Wei XY, Cao JP, Li P, Liu FJ, Zhao YP, Fan X, Zhao W, Rong LC, Wei YB, Wang SZ, Zhou J, Zong ZM.
    Journal: Bioresour Technol; 2012 Jul; 116():114-9. PubMed ID: 22609664.
    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.
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