Characterization of a bio-oil from pyrolysis of rice husk by detailed compositional analysis and structural investigation of lignin

详细信息	查看全文 | 推荐本文 |

• 作者：Yao Lu ; Xian-Yong Wei ; ^{wei_xianyong@163.com} ; Jing-Pei Cao ; Peng Li ; Fang-Jing Liu ; Yun-Peng Zhao ; Xing Fan ; Wei Zhao ; Liang-Ce Rong ; Yan-Bin Wei ; Shou-Ze Wang ; Jun Zhou ; Zhi-Min Zong
• 关键词：Rice husk ; Pyrolysis ; Compositional analysis ; Sequential extraction ; Lignin
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：July, 2012
• 卷：116
• 期：Complete
• 页码：114-119
• 文件大小：230 K

摘要

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鈥?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.