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Lignin‐First Fractionation of Softwood Lignocellulose Using a Mild Dimethyl Carbonate and Ethylene Glycol Organosolv Process
Author(s) -
De Santi Alessandra,
Galkin Maxim V.,
Lahive Ciaran W.,
Deuss Peter J.,
Barta Katalin
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201903526
Subject(s) - organosolv , depolymerization , lignin , chemistry , softwood , ethylene glycol , dimethyl carbonate , cellulose , solvent , organic chemistry , fractionation , yield (engineering) , nuclear chemistry , materials science , catalysis , metallurgy , composite material
A mild lignin‐first acidolysis process (140 °C, 40 min) was developed using the benign solvent dimethyl carbonate (DMC) and ethylene glycol (EG) as a stabilization agent/solvent to produce a high yield of aromatic monophenols directly from softwood lignocellulose (pine, spruce, cedar, and Douglas fir) with a depolymerization efficiency of 77–98 %. Under the optimized conditions (140 °C, 40 min, 400 wt % EG and 2 wt % H 2 SO 4 to pinewood), up to 9 wt % of the aromatic monophenol was produced, reaching a degree of delignification in pinewood of 77 %. Cellulose was also preserved, as evidenced by a 85 % glucose yield after enzymatic digestion. An in‐depth analysis of the depolymerization oil was conducted by using GC‐MS, HPLC, 2 D‐NMR, and size‐exclusion chromatography, which provided structural insights into lignin‐derived dimers and oligomers and the composition of the sugars and derived molecules. Mass balance evaluation was performed.