Impact of Torrefaction on the Chemical Structure of Birch Wood

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Shoulaifar TK, DeMartini N, Willfor S, Pranovich A, Smeds AI, Virtanen TAP, Maunu SL, Verhoeff F, Kiel JHA, Hupa M
Publication year: 2014
Journal: Energy and Fuels
Journal acronym: ENERG FUEL
Volume number: 28
Issue number: 6
Start page: 3863
End page: 3872
Number of pages: 10
ISSN: 0887-0624


Torrefaction is the thermal pretreatment of biomass at temperatures of 200-300 degrees C in an inert atmosphere with the objectives of improving resistance to biodegradation, reducing hydrophilicity, improving grindability and increasing energy density. In this work, we studied the effect of torrefaction temperature (240-280 degrees C) on the chemistry of birch wood. The samples were from a pilot plant at ECN, and in that way, they were representative of industrially produced samples. We have measured the concentration of hemicellulose and cellulose; changes in the extractives content and composition; and in the lignin structure. We used acid methanolysis and acid hydrolysis for hemicellulose and cellulose analysis, respectively; Klason lignin method, C-13 CP-MAS NMR, Dipolar Dephasing NMR, and Py-GC-MS analysis for lignin characterization; and acetone extraction, HPSEC, GC-FID, and GC-MS analysis for extractives characterization. The results provide a more complete picture of the chemical changes in wood by torrefaction.

Last updated on 2020-24-02 at 04:41