Interactions between Low- and High-Molecular-Weight Portions of Lignin during Fast Pyrolysis at Low Temperatures

被引:10
作者
Chua, Yee Wen [1 ]
Wu, Hongwei [1 ]
Yu, Yun [1 ]
机构
[1] Curtin Univ, Discipline Chem Engn, Western Australian Sch Mines Minerals Energy & Ch, GPO Box U1987, Perth, WA 6845, Australia
基金
澳大利亚研究理事会;
关键词
BIO-OIL; BEHAVIOR; DEPOLYMERIZATION; CHEMISTRY; PRODUCTS; NMR;
D O I
10.1021/acs.energyfuels.9b02813
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This study investigates the interactions between low- and high-molecular-weight portions of lignin during fast pyrolysis at 100-300 degrees C. Lignin was extracted via tetrahydrofuran (THF) into the THF-soluble and -insoluble fractions, which represent the low-molecular-weight (LMW) and high-molecular-weight (HMW) portions of lignin, respectively. As pyrolysis temperature increases, the char yield of the LMW lignin decreases more significantly than that of the HMW lignin. During fast pyrolysis, the experimentally measured char yields from the whole lignin are consistently higher than those calculated from the respective char yields of the LMW and HMW portions via addition, increasing from similar to 0.5 wt % at 100 degrees C to similar to 10.7 wt % at 300 degrees C. Such char yield differences provide direct evidence on the existence of interactions between the LMW and HMW portions of lignin during fast pyrolysis of the whole lignin. The results suggest that the formation of the liquid intermediate phase from the LMW portion suppresses the release of volatiles from both the LMW and HMW portions, resulting in a higher char yield during fast pyrolysis of the whole lignin. Experimental results further show that such interactions also result in changes in lignin char structures (especially at temperatures of >150 degrees C) because of enhanced polymerization reactions of oxygenated functional groups and aromatic structures with fused rings of 2-5. As a result, more condensed char structures are formed, as evidenced by the decreased atomic O/C and H/C ratios for the chars produced from the whole lignin pyrolysis.
引用
收藏
页码:11173 / 11180
页数:8
相关论文
共 47 条
  • [1] LIGNIN CHEMISTRY - PAST, PRESENT AND FUTURE
    ADLER, E
    [J]. WOOD SCIENCE AND TECHNOLOGY, 1977, 11 (03) : 169 - 218
  • [2] [Anonymous], 2011, ANN BOOK ASTM STAND, V82, P1, DOI [DOI 10.1520/E0870-82R06, DOI 10.1520/E0870-82R06.2]
  • [3] Argyropoulos D.S., 1997, Adv. Biochem. Eng. Biotech, V57, P127, DOI DOI 10.1007/BFB0102073
  • [4] Mechanistic Investigation into Bed Agglomeration during Biomass Fast Pyrolysis in a Fluidized-Bed Reactor
    Burton, Alan
    Wu, Hongwei
    [J]. ENERGY & FUELS, 2012, 26 (11) : 6979 - 6987
  • [5] The pyrolysis chemistry of a β-O-4 type oligomeric lignin model compound
    Chu, Sheng
    Subrahmanyam, Ayyagari V.
    Huber, George W.
    [J]. GREEN CHEMISTRY, 2013, 15 (01) : 125 - 136
  • [6] Structural changes of chars produced from fast pyrolysis of lignin at 100-300 °C
    Chua, Yee Wen
    Yu, Yun
    Wu, Hongwei
    [J]. FUEL, 2019, 255
  • [7] Thermal decomposition of pyrolytic lignin under inert conditions at low temperatures
    Chua, Yee Wen
    Yu, Yun
    Wu, Hongwei
    [J]. FUEL, 2017, 200 : 70 - 75
  • [8] Overview of applications of biomass fast pyrolysis oil
    Czernik, S
    Bridgwater, AV
    [J]. ENERGY & FUELS, 2004, 18 (02) : 590 - 598
  • [9] Effect of Torrefaction on the Structure and Pyrolysis Behavior of Lignin
    Dai, Gongxin
    Zou, Qun
    Wang, Shurong
    Zhao, Yuan
    Zhu, Lingjun
    Huang, Qunxing
    [J]. ENERGY & FUELS, 2018, 32 (04) : 4160 - 4166
  • [10] Sequential Extraction and Characterization of Lignin-Derived Compounds from Thermochemically Processed Biorefinery Lignins
    Dodge, Luke A.
    Kalinoski, Ryan M.
    Das, Lalitendu
    Bursavich, Jacob
    Muley, Pranjali
    Boldor, Dorin
    Shi, Jian
    [J]. ENERGY & FUELS, 2019, 33 (05) : 4322 - 4330