Ozone oxidation pretreatment of softwood kraft lignin: An effective and environmentally friendly approach to enhance fast pyrolysis product selectivity

被引：34

作者：

Du, Xiongjian ^{[1
]}

Wu, Shubin ^{[1
]}

Li, Tengfei ^{[1
]}

Yin, Yihui ^{[1
]}

Zhou, Jingmo ^{[1
]}

机构：

[1] South China Univ Technol, State Key Lab Pulp & Paper Engn, 381 Wushan Rd, Guangzhou 510640, Guangdong, Peoples R China

来源：

FUEL PROCESSING TECHNOLOGY | 2022年 / 231卷

关键词：

Kraft lignin; Ozone pretreatment; Fast pyrolysis; Pyrolysis products; WHEAT-STRAW; DEPOLYMERIZATION; BEHAVIOR; BIOMASS; POPLAR; RAW;

D O I：

10.1016/j.fuproc.2022.107232

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

To enhance the efficiency and environmentally friendliness of the pyrolysis of lignin, we investigated the effects of ozone oxidation pretreatment on the softwood lignin structure and pyrolysis product distribution during the pyrolysis process. Fundamental characteristic analysis shows that the structure of lignin after pretreatment changed compared with that of the original lignin. The lignin side chain hydroxyl was oxidized to carbonyl or carboxyl, enhancing the depolymerization of lignin. 2D HSQC NMR analysis reveals that pretreatment mainly interrupted unstable chemical bonds like ether linkage of lignin. In order to determine the effect of pretreatment on pyrolysis, the pyrolysis experiment was performed on raw and pretreated lignin separately. Results showed that the pretreatment improves the yield of bio-oil from lignin pyrolysis. Furthermore, the relative content of phydroxyphenyl type phenols derived from lignin pyrolysis is positively correlated with the oxidation degree. Thus, the pretreatment has great potential in improving aromatic production during pyrolysis of lignin, and could selectively transform lignin to high value-added platform compounds.

引用

页数：9

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