Optimization of Hydrothermal Pretreatment of Lignocellulosic Biomass in the Bioethanol Production Process

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Christos K. Nitsos; Konstantinos A. Matis; Kostas S. Triantafyllidis

2012

Scholarcy highlights

  • As a service to our authors and readers, this journal provides supporting information supplied by the authors
  • Appropriate selection of the pretreatment temperature and time leads to a process liquid that can be enriched in xylose or in furfural and acetic acid
  • Hydrothermal pretreatment in pure water represents a challenging approach because it is a method with low operational costs and does not involve the use of organic solvents, difficult to handle chemicals, and “external” liquid or solid catalysts
  • Hydrothermal treatment experiments were conducted in a batch-mode, high-pressure reactor under autogeneous pressure at varying temperature and time regimes, and at a liquid-to-solid ratio of 15
  • The major changes induced in the solid biomass were the dissolution/removal of hemicellulose to the process liquid and the partial removal and relocation of lignin on the external surface of biomass particles in the form of recondensed droplets
  • Maximum xylan recovery in the hydrothermal process liquid was observed at about 80 wt % hemicellulose removal; this was accomplished by moderate treatment severities
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