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Title: A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks

Abstract

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 radicalmore » 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.« less

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [3]
  1. Southeast Univ., Nanjing (China)
  2. Qingdao Univ. (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JICS); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1606833
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Polymers
Additional Journal Information:
Journal Volume: 11; Journal Issue: 9; Journal ID: ISSN 2073-4360
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; pyrolysis oils; biochar; elemental analysis; nuclear magnetic resonance (NMR) analysis

Citation Formats

Ben, Haoxi, Wu, Fengze, Wu, Zhihong, Han, Guangting, Jiang, Wei, and Ragauskas, Arthur J. A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks. United States: N. p., 2019. Web. https://doi.org/10.3390/polym11091387.
Ben, Haoxi, Wu, Fengze, Wu, Zhihong, Han, Guangting, Jiang, Wei, & Ragauskas, Arthur J. A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks. United States. https://doi.org/10.3390/polym11091387
Ben, Haoxi, Wu, Fengze, Wu, Zhihong, Han, Guangting, Jiang, Wei, and Ragauskas, Arthur J. Fri . "A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks". United States. https://doi.org/10.3390/polym11091387. https://www.osti.gov/servlets/purl/1606833.
@article{osti_1606833,
title = {A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks},
author = {Ben, Haoxi and Wu, Fengze and Wu, Zhihong and Han, Guangting and Jiang, Wei and Ragauskas, Arthur J.},
abstractNote = {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.},
doi = {10.3390/polym11091387},
journal = {Polymers},
number = 9,
volume = 11,
place = {United States},
year = {2019},
month = {8}
}

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