Mild alkaline hot-water extraction of lignin from spruce wood

B3 Non-refereed conference proceedings

Internal Authors/Editors

Publication Details

List of Authors: Korotkova E, Pranovich A, Willför S
Editors: J.C. del Río, A. Gutiérrez, J. Rencoret, Á.T. Martínez
Place: Séville
Publication year: 2014
Publisher: Institute of Natural Resources and Agrobiology of Seville (IRNAS-CSIC)
Book title: 13th European Workshop on Lignocellulosics and Pulp : EWLP 2014
Start page: 471
End page: 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.

Last updated on 2020-30-09 at 04:18