Journal of Industrial and Engineering Chemistry, Vol.30, 302-308, October, 2015
Structural features of lignin-rich solid residues obtained from two-step acid-hydrolysis of Miscanthus biomass (Miscanthus sacchariflorus Benth.)
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Miscanthus was subjected to two-step hydrolysis under different concentrations of sulfuric-acid (first-step: 72.18%; second-step: 36.2%) for conversion to monomeric sugars and lignin-rich solid residues. Compared to native lignin isolated from Miscanthus, there were obvious reductions of phenolic hydroxyl(0.5.2.6% vs. 5.9%) and methoxyl groups(3.0.13.9% vs. 16.5%) in solid residues. TGA confirmed that thermal stability of solid residues was proportional to greater abundance of condensed lignin structures and inversely proportional to remaining carbohydrate amount. Py-GC/MS revealed that sum of lignin derivatives (H-,G-,S-type phenols) amounted to 23.76% of the levels of MWL, meaning that lignins in solid residues seem to be highly condensed.
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