Mild alkaline hot-water extraction of lignin from spruce wood

    Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinen


    The aim of this study was to isolate lignin from spruce wood with an Accelerated Solvent Extractor (ASE) using low concentration of aqueous NaOH and characterise the products in order to understand how the process parameters affects the chemistry involved. Two concentration of alkali were studied – 1% and 2% aqueous NaOH. Extraction was performed for 4 hours total time, but different extraction sequences were studied: 1×240 min, 2×120 min, 4×60 min, 6×40 min, and 12×20 min. It was found that higher alkali concentration allows extracting more lignin from spruce wood. The extraction sequence has great influence on the process – shorter extraction times extracted up to 10 times more lignin compared to longer extraction times. Xylose and galactose were the most abundant carbohydrate impurities in the isolated lignins. The average molar mass of lignin increased with the extraction time and concentration of alkali.
    AlkuperäiskieliEi tiedossa
    Otsikko13th European Workshop on Lignocellulosics and Pulp : EWLP 2014
    ToimittajatJC del Río, A. Gutiérrez, J. Rencoret, ÁT Martínez
    KustantajaInstitute of Natural Resources and Agrobiology of Seville (IRNAS-CSIC)
    ISBN (painettu)9788461698424
    TilaJulkaistu - 2014
    OKM-julkaisutyyppiB3 Ei-soviteltu artikkeli konferenssin julkaisusarjassa
    Tapahtumaconference; 2014-06-24; 2014-06-27 - Seville, Spain
    Kesto: 24 kesäk. 201427 kesäk. 2014


    Konferenssiconference; 2014-06-24; 2014-06-27