Comprehensive evaluation of the liquid fraction during the hydrothermal treatment of rapeseed straw.

摘要: The requirement for efficient and green conversion technologies has prompted hydrothermal processing as a promising treatment option sustainable biorefinery industry. been applied to process plenty of lignocellulose materials, yielding abundant high value-degraded products, especially the products in liquid fraction. Therefore, it is essential systematically evaluate degraded aqueous fraction by comprehensive analysis structural characterization during treatment. Rapeseed straw was hydrothermally treated at temperature ranging from 145 205 °C various retention time (15, 30, 60 120 min), polysaccharides lignin phase were evaluated characterization. Results showed that with an increase severity, polymers gradually depolymerized resulting decrease molecular weight 8430 (log R 0 3.26) 2130 g/mol 5.08), oligosaccharides 19.44 2.88) 99.94 g/kg 4.32) monosaccharides 0.91 30.43 g/kg 4.37). With monosaccharide degradation components (8.26 125.68 g/kg), saccharides decreased after its maximum value. yield (99.94 g/kg) accompanying relatively low level (17.77 g/kg) obtained (190 °C) short reaction (15 min). had linear backbone (1 → 4)-linked β-d-xylopyranosyl xylan decorated branches based on 2D NMR spectra analysis. Lignin strongly condensed S/G ratio severity increased. yields constitutions have incomplete correlation severity. fractions subjected indicated significant influence composition structure phase. could be adopted obtain XOS-rich limited formation by-products. In addition, result expected further reveal mechanisms rapeseed facilitate value-added applications agricultural residues