Mild alkaline hot-water extraction of lignin from spruce wood

    Research output: Chapter in Book/Conference proceedingConference contributionScientific


    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.
    Original languageUndefined/Unknown
    Title of host publication13th European Workshop on Lignocellulosics and Pulp : EWLP 2014
    EditorsJC del Río, A. Gutiérrez, J. Rencoret, ÁT Martínez
    PublisherInstitute of Natural Resources and Agrobiology of Seville (IRNAS-CSIC)
    ISBN (Print)9788461698424
    Publication statusPublished - 2014
    MoE publication typeB3 Non-refereed article in conference proceedings
    Eventconference; 2014-06-24; 2014-06-27 - Seville, Spain
    Duration: 24 Jun 201427 Jun 2014


    Conferenceconference; 2014-06-24; 2014-06-27

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