Oxidative degradation of the extraction residue from a sawdust. (15th January 2018)

• Record Type: Journal Article
• Authors: Xu, Dan-Dan; Zong, Zhi-Min; Li, Wei-Tu; Wang, Sheng-Kang; Lv, Jing-Hui; Liu, Zhong-Qiu; Li, Zhan-Ku; Duan, Pei-Gao; Wei, Xian-Yong
• Is Part Of: Fuel. Volume 212(2018)
• Page Start: 586
• Page End: 592
• Publication Date: 2018-01-15
• Subjects: Sawdust -- Extraction residue -- Oxidation; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2017.10.075
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Typical products from the oxidative degradation of the extraction residue (ER) and their possible precursors in the ER. Highlights: About 16.1% of organic matter in the ER was degraded to a SP with AHPO/AAH. Most of the SP are carboxylic acids, especially non-aromatic dicarboxylic acids. HO, HOO, and CH3 COO play crucial roles in the oxidative degradation of the ER. Abstract: The extraction residue (ER) from a sawdust was oxidatively degraded with aqueous hydrogen peroxide (AHPO)/acetic anhydride (AAH) under mild conditions. About 16.1% of organic matter in the ER was converted to soluble portion (SP). In total, 76 compounds were detected in the SP from the reaction mixture by two-dimensional gas chromatography/time of flight-mass spectrometry. They can be classified into 20 group components. Among them, carboxylic acids (CAs) are the most abundant, accounting for ca. 57.2%. Most of the CAs are non-aromatic ones, especially non-aromatic dicarboxylic acids. All the esters produced from the ER degradation are acetates and diacetates. The results suggest that molecular composition of macromolecular species in the sawdust is complicated and the species without highly condensed aromatic rings tend to be oxidatively degraded to soluble compounds with AHPO/AAH. In addition, CH3 COO from AAH decomposition involved in the oxidative degradation of the sawdust.