Cellulose co-crystallization and related phenomena occurring in hydrothermal treatment of sugarcane bagasse View Full Text


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Article Info

DATE

2015-08

AUTHORS

Carlos Driemeier, Fernanda M. Mendes, Beatriz S. Santucci, Maria T. B. Pimenta

ABSTRACT

Lateral dimensions of cellulose crystallites have been widely reported to increase as plant biomasses are submitted to a variety of high-temperature chemical treatments. Cellulose co-crystallization is often indicated to be the phenomenon underlying crystallite dimensional change, but precise mechanisms and relationships with concurrent phenomena are not well understood. This work investigates cellulose structural evolution in sugarcane bagasse submitted to wide range (160–190 °C, up to ≈50 % solubilization) of hydrothermal treatments, performed in pressurized liquid hot water. Cellulose structural characterization combines fiber and powder X-ray diffraction with analysis of two-dimensional diffraction patterns employing the Cellulose Rietveld Analysis for Fine Structure (CRAFS) model. We observe that increases in lateral dimensions of cellulose crystallites closely follow changes in bagasse chemical composition. For a given composition, treatment temperature per se seems to be secondary for changes in crystallites. Partial cellulose de-crystallization and decreasing distortion of crystallite unit cell are found to co-occur with increasing crystallite lateral dimensions. Our interpretation of results emphasizes the importance of removing hemicelluloses acting as intercrystallite spacers, which seems to be the limiting factor for cellulose co-crystallization. More... »

PAGES

2183-2195

References to SciGraph publications

  • 2013-10. Effects of pressurized hot water extraction on the nanoscale structure of birch sawdust in CELLULOSE
  • 2014-08. Comparison of changes in cellulose ultrastructure during different pretreatments of poplar in CELLULOSE
  • 2015-05. Multiscale deconstruction of molecular architecture in corn stover in SCIENTIFIC REPORTS
  • 2014-04. Two-dimensional Rietveld analysis of celluloses from higher plants in CELLULOSE
  • 2014-04. Morphological changes in the cellulose and lignin components of biomass occur at different stages during steam pretreatment in CELLULOSE
  • 2014-04. Structural coarsening of aspen wood by hydrothermal pretreatment monitored by small- and wide-angle scattering of X-rays and neutrons on oriented specimens in CELLULOSE
  • 2014-04. Size, shape, and arrangement of native cellulose fibrils in maize cell walls in CELLULOSE
  • 2014-12. Effect of lignin content on changes occurring in poplar cellulose ultrastructure during dilute acid pretreatment in BIOTECHNOLOGY FOR BIOFUELS
  • 2014-10. X-ray diffraction from faulted cellulose I constructed with mixed Iα–Iβ stacking in CELLULOSE
  • 2012-10. Cellulose crystals in fibrovascular bundles of sugarcane culms: orientation, size, distortion, and variability in CELLULOSE
  • 2009-12. Structure of cellulose and microcrystalline cellulose from various wood species, cotton and flax studied by X-ray scattering in CELLULOSE
  • 2014-04. Idealized powder diffraction patterns for cellulose polymorphs in CELLULOSE
  • 2011-12. Evolution of cellulose crystals during prehydrolysis and soda delignification of sugarcane lignocellulose in CELLULOSE
  • 1999-06. Hydrothermal processing of lignocellulosic materials in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
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