Articles producció científica> Enginyeria Química

Acid-catalyzed fractionation of almond shells in ?-valerolactone/water

  • Identification data

    Identifier: imarina:9150148
    Handle: https://hdl.handle.net/20.500.11797/imarina9150148
    Authors:
    Corti ATorrens EMontané D
    Abstract:
    © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature. The fractionation of almond shells, an agro-industry residue available in some Mediterranean climate regions, was investigated using acid-catalyzed hydrolysis in γ-valerolactone (GVL)/water. A set of non-isothermal experiments at nominal temperatures of 120, 140, and 160 °C and sulfuric acid concentrations from 25 to 75 mM were developed using a constant 80% w/w GVL in water concentration and a reaction time of up to 120 min. GVL was an efficient medium and promoted solubilization of both lignin and hemicellulose, even at low temperature during the initial period of reactor heating, while cellulose conversion was limited. A temperature of 160 °C gave the highest extraction of lignin and hemicellulose, but recovery of hemicellulose carbohydrates was better below 140 °C. Sulfuric acid concentrations above 45 mM promoted excessive dehydration of xylose and glucose to furans and humins, which were recovered with lignin. A model was developed to describe the kinetics of lignin and hemicellulose solubilization. It distinguished three fractions of different reactivity in each polymer (lignin or hemicellulose): fast-reacting, slow-reacting, and unreactive. The amount of each fraction was correlated with acid concentration and reaction temperature. Activation energies and the other parameters in the model were obtained numerically by least-squares optimization using the data from the non-isothermal experiments. Activation energies for the fast-reacting and slow-reacting fractions of hemicellulose were 142 and 39.7 kJ mol−1, and for those of lignin 134 and 71.7 kJ mol−1, respectively. Acid concentration had a larger influence than temperature on establishing the amounts of slow-rea

  • Others:

    Author, as appears in the article.: Corti A; Torrens E; Montané D
    Department: Enginyeria Química
    e-ISSN: 2190-6823
    URV's Author/s: Montané Calaf, Daniel / Torrens Serrahima, Esther
    Keywords: Organosolv fractionation Kinetic modeling Delignification Almond shells
    Abstract: © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature. The fractionation of almond shells, an agro-industry residue available in some Mediterranean climate regions, was investigated using acid-catalyzed hydrolysis in γ-valerolactone (GVL)/water. A set of non-isothermal experiments at nominal temperatures of 120, 140, and 160 °C and sulfuric acid concentrations from 25 to 75 mM were developed using a constant 80% w/w GVL in water concentration and a reaction time of up to 120 min. GVL was an efficient medium and promoted solubilization of both lignin and hemicellulose, even at low temperature during the initial period of reactor heating, while cellulose conversion was limited. A temperature of 160 °C gave the highest extraction of lignin and hemicellulose, but recovery of hemicellulose carbohydrates was better below 140 °C. Sulfuric acid concentrations above 45 mM promoted excessive dehydration of xylose and glucose to furans and humins, which were recovered with lignin. A model was developed to describe the kinetics of lignin and hemicellulose solubilization. It distinguished three fractions of different reactivity in each polymer (lignin or hemicellulose): fast-reacting, slow-reacting, and unreactive. The amount of each fraction was correlated with acid concentration and reaction temperature. Activation energies and the other parameters in the model were obtained numerically by least-squares optimization using the data from the non-isothermal experiments. Activation energies for the fast-reacting and slow-reacting fractions of hemicellulose were 142 and 39.7 kJ mol−1, and for those of lignin 134 and 71.7 kJ mol−1, respectively. Acid concentration had a larger influence than temperature on establishing the amounts of slow-reacting hemicellulose and lignin, whereas temperature was the dominant variable concerning the fractions of non-reacting polymers.
    Thematic Areas: Renewable energy, sustainability and the environment Química Interdisciplinar Ensino Engineering, chemical Engenharias ii Energy & fuels Ciências biológicas ii Ciências agrárias i Ciência de alimentos Biotecnología
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 2190-6815
    Author's mail: daniel.montane@urv.cat esther.torrens@urv.cat esther.torrens@urv.cat
    Author identifier: 0000-0002-5273-8870
    Record's date: 2024-08-03
    Papper version: info:eu-repo/semantics/acceptedVersion
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Biomass Conversion And Biorefinery. 13 (4): 2729-2743
    APA: Corti A; Torrens E; Montané D (2023). Acid-catalyzed fractionation of almond shells in ?-valerolactone/water. Biomass Conversion And Biorefinery, 13(4), 2729-2743. DOI: 10.1007/s13399-020-01261-4
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2023
    Publication Type: Journal Publications

  • Keywords:

    Energy & Fuels,Engineering, Chemical,Renewable Energy, Sustainability and the Environment
    Organosolv fractionation
    Kinetic modeling
    Delignification
    Almond shells
    Renewable energy, sustainability and the environment
    Química
    Interdisciplinar
    Ensino
    Engineering, chemical
    Engenharias ii
    Energy & fuels
    Ciências biológicas ii
    Ciências agrárias i
    Ciência de alimentos
    Biotecnología

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