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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/21918

    Título
    Online integrated fractionation-hydrolysis of lignocellulosic biomass using sub- and supercritical water
    Autor
    Piqueras, Cristian Martín
    Cantero Sposetti, Danilo AlbertoAutoridad UVA Orcid
    García Serna, JuanAutoridad UVA Orcid
    Cocero Alonso, María JoséAutoridad UVA Orcid
    Gallina, GianlucaAutoridad UVA
    Cabeza Sánchez, ÁlvaroAutoridad UVA Orcid
    Año del Documento
    2017
    Editorial
    Juan García-Serna b,⇑, María J. Cocero b
    Descripción
    Producción Científica
    Documento Fuente
    Chemical Engineering Journal, Volume 308, 15 January 2017, Pages 110-125
    Abstract
    A novel process coupling the fractionation and hydrolysis reactors is presented. Holm oak was used as real lignocellulosic biomass to be treated. In the fractionation reactor, hemicellulose and cellulose were solubilized and partially hydrolyzed in different stages with the aim of feeding the hydrolysis reactor with high C5 or C6 concentrations respectively. The fractionation was performed in two stages: at 180 °C optimizing the hemicellulose extraction and at 260 °C extracting cellulose and hard hemicellulose remaining in the biomass structure. Three water flows were tested: 11, 17 and 26 cm3/min. Sugar yields from 71 to 75% were reached, mainly composed of xylose and glucose oligomers and lower amounts of other chemicals, like retro-aldol products, acetic acid or 5-HMF. The outlet stream from the fractionation reactor was directly mixed with sub or supercritical water at the inlet mixer of a supercritical hydrolysis reactor where the reaction time was precisely controlled. The temperature, pressure and reaction time were modified to get an insight of their effect on the yield of retro-aldol condensation products. Yields of 24% for glycolaldehyde, and pyruvaldehyde were found at 8.3 s, 350 °C and 162 bar (hydrolysis reactor conditions). On other hand, 25% of lactic acid was found at 0.23 s, 396 °C and 245 bar. A discussion based on a known reaction pathway is proposed. Moreover, a kinetic model for the hydrolysis reactor was put forward, being able to reproduce the experimental data with deviations below 10% for sugars and other products extracted. This combined process performs a selective valorization of real lignocellulosic biomass, avoiding the costly process of extreme grinding needed for the fluidization in a continuous hydrothermal process.
    Materias (normalizadas)
    Kinetics
    Revisión por pares
    SI
    DOI
    10.1016/j.cej.2016.09.007
    Patrocinador
    Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA330U13)
    Version del Editor
    http://www.sciencedirect.com
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/21918
    Derechos
    openAccess
    Collections
    • BioEcoUVa - Artículos de revista [195]
    • DEP48 - Artículos de revista [265]
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    Integrated-Fractionation-Hydrolysis _rev0.pdf
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    Attribution-NonCommercial-NoDerivatives 4.0 InternationalExcept where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International

    Universidad de Valladolid

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