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The pyrolytic degradation of wood-derived lignin from pulping process

Shen, DK, Gu, S, Luo, KH, Wang, SR and Fang, MX (2010) The pyrolytic degradation of wood-derived lignin from pulping process Bioresource Technology, 101 (15, Au). pp. 6136-6146.

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Abstract

Lignin is a key component in the biomass with a complex polymeric structure of the phenyl-C3 alkyl units. The kraft lignin from the wood pulping process is tested in TG-FTIR and Py-GC-MS. The samples are pyrolyzed in TGA coupled with FTIR from 30 to 900 °C at the heating rate of 20 and 40 K/min. The evolution of phenolic compounds in the initial pyrolysis stage of lignin is determined by FTIR, while the second stage is mainly attributed to the production of the low molecular weight species. A bench-scale fast pyrolysis unit is employed to investigate the effect of temperature on the product yield and composition. It is found that the guaiacol-type and syringol-type compounds as the primary products of lignin pyrolysis are predominant in bio-oil, acting as the significant precursors for the formation of the derivatives such as the phenol-, cresol- and catechol-types. A series of free-radical chain-reactions, concerning the cracking of different side-chain structures and the methoxy groups on aromatic ring, are proposed to demonstrate the formation pathways for the typical compounds in bio-oil by closely relating lignin structure to the pyrolytic mechanisms. The methoxy group (–OCH3) is suggested to work as an important source for the formation of the small volatile species (CO, CO2 and CH4) through the relevant free radical coupling reactions.

Item Type: Article
Authors :
AuthorsEmailORCID
Shen, DKUNSPECIFIEDUNSPECIFIED
Gu, SUNSPECIFIEDUNSPECIFIED
Luo, KHUNSPECIFIEDUNSPECIFIED
Wang, SRUNSPECIFIEDUNSPECIFIED
Fang, MXUNSPECIFIEDUNSPECIFIED
Date : 21 March 2010
Funders : Innovation China UK, K Engineering and Physical Sciences Research Council (EPSRC)
Identification Number : https://doi.org/10.1016/j.biortech.2010.02.078
Copyright Disclaimer : Copyright © 2016 Elsevier B.V. or its licensors or contributors.
Uncontrolled Keywords : Kraft lignin, TG-FTIR, Py-GC-MS, Free radical, Phenolic compound
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 11:00
Last Modified : 28 Mar 2017 11:00
URI: http://epubs.surrey.ac.uk/id/eprint/810606

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