Comprehensive analysis of sugarcane bagasse steam explosion using autocatalysis and dilute acid hydrolysis (H3PO4 and H2SO4) at equivalent combined severity factors

Douglas Henrique Fockink, Jorge Hernán Sánchez, Luiz Pereira Ramos

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    22 Scopus citations

    Abstract

    Steam explosion of sugarcane bagasse was carried out in the absence (autocatalysis) and presence of dilute phosphoric (H3PO4) and dilute sulfuric (H2SO4) as exogenous acid catalysts. Seven experiments were designed to operate at the same combined severity factor (CSF) of 0.76 ± 0.02: three autocatalytic steam explosion (steam-exploded bagasse, SEB), three with dilute H2SO4 (SEB/SA) and one with dilute H3PO4 (SEB/PA) that was used as reference. Steam treatment at the same CSF produced substrates with similar chemical compositions, rheological behaviors and glucose yields by enzymatic hydrolysis at 15% total solids (TS) using Cellic CTec3, except for two SEB/SA experiments that were carried out at lower temperatures and shorter times. SEB were the best substrates because they required the lowest power consumption for hydrolysis at 15% TS compared to SEB/SA and SEB/PA. Carbohydrates, aliphatic acids, furans and aromatic compounds were also characterized in pretreatment water-solubles by GC–MS and these varied considerably regardless of their equivalence in pretreatment CSF.

    Original languageEnglish
    Pages (from-to)563-572
    Number of pages10
    JournalIndustrial Crops and Products
    Volume123
    DOIs
    StatePublished - 1 Nov 2018

    Bibliographical note

    Funding Information:
    The authors are grateful to CNPq (grants 551404/2010-8 and 311554/2011-3 ) and to the INCT in Energy and Environment for providing financial support to carry out this study, as well as to Novozymes Latin America (Araucária, PR, Brazil) for donating the enzyme preparations used for hydrolysis. The authors wish to thank CAPES for providing scholarship to D.H.F. and CYTED (Red Provalor, grant 312RT0456 ) for funding the student exchange between UFPR and UPB. Also, the authors acknowledge the technical support of Laís P. Dill, Daiane Szczerbowski and Débora M. Kochepka for helping with some analyses.

    Funding Information:
    The authors are grateful to CNPq (grants 551404/2010-8 and 311554/2011-3) and to the INCT in Energy and Environment for providing financial support to carry out this study, as well as to Novozymes Latin America (Araucária, PR, Brazil) for donating the enzyme preparations used for hydrolysis. The authors wish to thank CAPES for providing scholarship to D.H.F. and CYTED (Red Provalor, grant 312RT0456) for funding the student exchange between UFPR and UPB. Also, the authors acknowledge the technical support of Laís P. Dill, Daiane Szczerbowski and Débora M. Kochepka for helping with some analyses.

    Publisher Copyright:
    © 2018 Elsevier B.V.

    Keywords

    • Acid catalysis
    • Combined severity factor
    • Enzymatic hydrolysis
    • Steam explosion
    • Sugarcane bagasse

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