Mild alkaline hot-water extraction of lignin from spruce wood

B3 Icke-referentgranskade konferenspublikationer

Interna författare/redaktörer

Publikationens författare: Korotkova E, Pranovich A, Willför S
Redaktörer: J.C. del Río, A. Gutiérrez, J. Rencoret, Á.T. Martínez
Förlagsort: Séville
Publiceringsår: 2014
Förläggare: Institute of Natural Resources and Agrobiology of Seville (IRNAS-CSIC)
Moderpublikationens namn: 13th European Workshop on Lignocellulosics and Pulp : EWLP 2014
Artikelns första sida, sidnummer: 471
Artikelns sista sida, sidnummer: 474
ISBN: 9788461698424


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.

Senast uppdaterad 2020-04-06 vid 05:17