Effects of various reaction parameters on solvolytical depolymerization of lignin in sub- and supercritical ethanol |
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Authors: | Jae-Young Kim Shinyoung Oh Hyewon Hwang Tae-su Cho In-Gyu Choi Joon Weon Choi |
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Institution: | 1. Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-921, Republic of Korea;2. Division of Wood Chemistry & Microbiology, Korea Forest Research Institute, 57 Hoegi-ro, Dongaemun-gu, Seoul 130-712, Republic of Korea |
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Abstract: | Organosolv lignin was treated with ethanol at sub/supercritical temperatures (200, 275, and 350 °C) for conversion to low molecular phenols under different reaction times (20, 40, and 60 min), solvent-to-lignin ratios (50, 100, and 150 mL g−1), and initial hydrogen gas pressures (2 and 3 MPa). Essential lignin-degraded products, oil (liquid), char (solid), and gas were obtained, and their yields were directly influenced by reaction conditions. In particular, concurrent reactions involving depolymerization and recondensation as well as further (secondary) decomposition were significantly accelerated with increasing temperature, leading to both lignin-derived phenols in the oil fraction and undesirable products (char and gas). |
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Keywords: | Organosolv lignin Depolymerization Sub/supercritical ethanol Monomeric phenols GC/MS |
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