A model of the chemical composition and pyrolysis kinetics of lignin |
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Authors: | Karla Dussan Stephen Dooley Rory F.D. Monaghan |
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Affiliation: | 1. Mechanical Engineering, National University of Ireland Galway, University Road, ENG-2053 Alice Perry Engineering Building, Galway, Ireland;2. MaREI Centre for Marine and Renewable Energy, Beaufort Building, Environmental Research Institute, University College Cork, Ringaskiddy, Co. Cork, Ireland;3. School of Physics, Trinity College Dublin, The University of Dublin, College Green, Dublin 2, Ireland |
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Abstract: | This study presents a novel approach for the chemical representation of lignin for modelling the reaction kinetics of lignin in lignocellulosic biomass. This methodology relies on the definition of dimeric pseudo-components containing phenolic functionalities, i.e., p-hydroxyphenyl, guaiacyl and syringyl groups, as measured in real biomass and native lignin through wet chemistry and spectroscopic techniques. The reactivities of the lignin pseudo-components are modelled through a series of lumped unidirectional reactions, whose product formation and reaction rate constants are optimised to replicate a comprehensive experimental dataset gathered from several works available in the literature. The new kinetic model contributes to the state-of-the-art by providing a more accurate depiction of the conversion rates, selectivity of char vs. volatiles, and aromatic composition in condensable products in line with the inherent reactivity of lignin functionalities and the empirical observations of lignin depolymerisation and thermal degradation at low (<1?K/s) and high heating rates (>50?K/s). |
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Keywords: | Lignin Pyrolysis Lignocellulosic biomass Reaction kinetics Kinetic model |
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