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A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks

Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than py...

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Autores principales: Ben, Haoxi, Wu, Fengze, Wu, Zhihong, Han, Guangting, Jiang, Wei, Ragauskas, Arthur J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780934/
https://www.ncbi.nlm.nih.gov/pubmed/31450759
http://dx.doi.org/10.3390/polym11091387
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author Ben, Haoxi
Wu, Fengze
Wu, Zhihong
Han, Guangting
Jiang, Wei
Ragauskas, Arthur J.
author_facet Ben, Haoxi
Wu, Fengze
Wu, Zhihong
Han, Guangting
Jiang, Wei
Ragauskas, Arthur J.
author_sort Ben, Haoxi
collection PubMed
description Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than pyrolysis oils (energy densification ratios: 1.13–1.19, energy yields: 30.16–34.42%). The pyrolysis oils have higher heating values (~25 MJ/kg) than bio-oils (~20 MJ/kg) from wood and agricultural residues, and the higher heating values of char (~31 MJ/kg) are comparable to that of many commercial coals. The elemental analysis indicated that the lower O/C value and higher H/C value represent a more valuable source of energy for pyrolysis oils than biomass. The nuclear magnetic resonance results demonstrated that the most abundant hydroxyl groups of pyrolysis oil are aliphatic OH groups, catechol, guaiacol, and p-hydroxy-phenyl OH groups. The aliphatic OH groups are mainly derived from the cleavage of cellulose glycosidic bonds, while the catechol, guaiacol, and p-hydroxy-phenyl OH groups are mostly attributed to the cleavage of the lignin β–O-4 bond. Significant amount of aromatic carbon (~40%) in pyrolysis oils is obtained from tannin and lignin components and the aromatic C–O bonds may be formed by a radical reaction between the aromatic and aliphatic hydroxyl groups. In this study, a comprehensive analytical method was developed to fully understand and evaluate the pyrolysis products produced from softwood barks, which could offer valuable information on the pyrolysis mechanism of biomass and promote better utilization of pyrolysis products.
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spelling pubmed-67809342019-10-30 A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks Ben, Haoxi Wu, Fengze Wu, Zhihong Han, Guangting Jiang, Wei Ragauskas, Arthur J. Polymers (Basel) Article Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than pyrolysis oils (energy densification ratios: 1.13–1.19, energy yields: 30.16–34.42%). The pyrolysis oils have higher heating values (~25 MJ/kg) than bio-oils (~20 MJ/kg) from wood and agricultural residues, and the higher heating values of char (~31 MJ/kg) are comparable to that of many commercial coals. The elemental analysis indicated that the lower O/C value and higher H/C value represent a more valuable source of energy for pyrolysis oils than biomass. The nuclear magnetic resonance results demonstrated that the most abundant hydroxyl groups of pyrolysis oil are aliphatic OH groups, catechol, guaiacol, and p-hydroxy-phenyl OH groups. The aliphatic OH groups are mainly derived from the cleavage of cellulose glycosidic bonds, while the catechol, guaiacol, and p-hydroxy-phenyl OH groups are mostly attributed to the cleavage of the lignin β–O-4 bond. Significant amount of aromatic carbon (~40%) in pyrolysis oils is obtained from tannin and lignin components and the aromatic C–O bonds may be formed by a radical reaction between the aromatic and aliphatic hydroxyl groups. In this study, a comprehensive analytical method was developed to fully understand and evaluate the pyrolysis products produced from softwood barks, which could offer valuable information on the pyrolysis mechanism of biomass and promote better utilization of pyrolysis products. MDPI 2019-08-23 /pmc/articles/PMC6780934/ /pubmed/31450759 http://dx.doi.org/10.3390/polym11091387 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ben, Haoxi
Wu, Fengze
Wu, Zhihong
Han, Guangting
Jiang, Wei
Ragauskas, Arthur J.
A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title_full A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title_fullStr A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title_full_unstemmed A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title_short A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
title_sort comprehensive characterization of pyrolysis oil from softwood barks
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780934/
https://www.ncbi.nlm.nih.gov/pubmed/31450759
http://dx.doi.org/10.3390/polym11091387
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