Co-production of biofuels and value-added compounds from industrial Eucalyptus globulus bark residues using hydrothermal treatment

Abstract In this work, hydrothermal treatment was assessed for the fractionation of industrial Eucalyptus globulus bark residue (EBR) to obtain biofuels and value-added compounds (such as oligosaccharides phenolic compounds) in separated streams. Hydrothermal evaluated under non-isothermal regimen range maximum temperature (Tmax) 177–228 °C or severities (S0) between 2.76 4.25. The highest concentration (17.5 g/L) achieved at S0 3.69, corresponding hemicellulose recovery 77.30%. Under all over 90.94% 84.17% cellulose lignin remained solid phase, respectively. increase improved 4.38-fold enzymatic saccharification cellulose, glucose yield (84%) being 4.04. Considering maximal polysaccharides from liquid phases, 4.04 selected bioethanol production using high loadings following different strategies (simultaneous fermentation – SSF pre-saccharification simultaneous PSSF). utilization 15% hydrothermally pretreated EBR without nutrient supplementation resulted 26 g/L ethanol, independently strategy used. An up 17.5% solids employing enabled 38 g/L (or 4.8% v/v) ethanol by PSSF.