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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6441

    Título
    Semi-continuous hydrolysis of onion skin wastes with subcritical water: pectin recovery and oligomers identification
    Autor
    Benito Román, OscarUBU authority Orcid
    Alonso Riaño, PatriciaUBU authority Orcid
    Díaz de Cerio Alonso de Mezquía, ElixabetUBU authority Orcid
    Sanz Díez, Mª TeresaUBU authority Orcid
    Beltrán Calvo, SagrarioUBU authority Orcid
    Publicado en
    Journal of Environmental Chemical Engineering. 2022, V. 10, n. 3, 107439
    Editorial
    Elsevier
    Fecha de publicación
    2022-06
    ISSN
    2213-3437
    DOI
    10.1016/j.jece.2022.107439
    Abstract
    The semi-continuous hydrolysis of onion skin wastes (OSW) using subcritical water (SubW; working conditions: 105-180 ºC; 5 MPa; 2.5 mL/min) has been studied in this work. Liquids after hydrolysis showed a sharp increase in total organic carbon (>30 mg/g OSW) at temperatures above 145 ºC, when SubW began to promote the partial hydrolysis of the structural components of OSW. Among them, pectin was one of main components recovered (extraction yield up to 9% at 145 ºC), whereas cellulose was barely hydrolyzed in the range of temperatures studied. The composition of pectin demonstrated that SubW promoted the recovery of the valuable RG-I (21.1±1.1 mol %) regions compared to acid water extraction processes (10.8±0.9 mol %). The control of the hydrolysis conditions was found to be critical, since high temperatures and long hydrolysis times led to the formation of organic acids (acetic, formic and levulinic) and degradation products such as furfural (up to 0.8 mg/g OSW) from the C5 sugars. Finally, the High Heating Value (HHV) calculated for the solid residue obtained at 180 ºC (16.4±0.2 MJ/kg) indicated the potential use of this residue as a fuel, once the valuable compounds (phenolics and pectins) have been recovered.
    Palabras clave
    Onion
    Subcritical water
    Pectin
    Hydrolysis
    Biomass
    RG-I
    Materia
    Ingeniería química
    Chemical engineering
    URI
    http://hdl.handle.net/10259/6441
    Versión del editor
    https://doi.org/10.1016/j.jece.2022.107439
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