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The Formation of Char, Gaseous and Liquid Products during Lignin Carbonization in Super‐ and Subcritical Solvents
Author(s) -
Luo Jia,
Yang Yating,
Yang Xingxia,
Han Bo,
Bao Guirong,
Li Jing
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601931
Subject(s) - lignin , carbonization , char , supercritical fluid , ethanol , chemistry , organic chemistry , carbon fibers , chemical engineering , pyrolysis , materials science , adsorption , composite number , engineering , composite material
The carbonization of lignin was performed using different solvents including ethanol, water and 50 vol % ethanol/water mixture under super‐ and subcritical conditions at 260 °C. The chars from lignin carbonization in supercritical ethanol provided low O/C ratio (0.09‐0.14) and considerable content of surface oxygen‐containing group (0.18‐0.32 mmol g −1 ). Supercritical ethanol substantially participated in lignin carbonization, while the activity of ethanol was also influenced by the chemical structure of lignin. High carbon recovery of 103.8 % for chars was obtained from dealkaline lignin with guaiacyl characteristics, accompained with the production of H 2 and high valuable C 6 ‐C 10 esters.