Mild alkaline hot-water extraction of lignin from spruce wood

    Forskningsoutput: Kapitel i bok/konferenshandlingKonferensbidragVetenskaplig

    Sammanfattning

    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.
    OriginalspråkOdefinierat/okänt
    Titel på gästpublikation13th European Workshop on Lignocellulosics and Pulp : EWLP 2014
    RedaktörerJC del Río, A. Gutiérrez, J. Rencoret, ÁT Martínez
    FörlagInstitute of Natural Resources and Agrobiology of Seville (IRNAS-CSIC)
    Sidor471–474
    ISBN (tryckt)9788461698424
    StatusPublicerad - 2014
    MoE-publikationstypB3 Ej refererad artikel i konferenshandlingar
    Evenemangconference; 2014-06-24; 2014-06-27 - Seville, Spain
    Varaktighet: 24 jun 201427 jun 2014

    Konferens

    Konferensconference; 2014-06-24; 2014-06-27
    Period24/06/1427/06/14

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