Lignin‐First Fractionation of Softwood Lignocellulose Using a Mild Dimethyl Carbonate and Ethylene Glycol Organosolv Process
Citations Over TimeTop 10% of 2020 papers
Abstract
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 % H2 SO4 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.
Related Papers
- → Batch microreactor studies of lignin and lignin model compound depolymerization by bases in alcohol solvents(1999)259 cited
- → Lignin Depolymerization with Phenol via Redistribution Mechanism in Ionic Liquids(2014)64 cited
- → Production of phenolic hydrocarbons using catalytic depolymerization of empty fruit bunch (EFB)-derived organosolv lignin on Hβ-supported Ru(2016)55 cited
- → Depolymerization of Organosolv Lignin to Valuable Chemicals over Homogeneous and Heterogeneous Acid Catalysts(2016)19 cited
- Co-and Ca-phosphate-based catalysts for the depolymerization of organosolv eucalytpus lignin(2015)