Structural changes in spruce wood during different steps of steam explosion pretreatment
Journal article, 2015

Steam explosion (SE) is a promising hydrothermal pretreatment technology for future biorefineries. In this study, the three steps of the steam explosion process, (1) the steam treatment (2) the explosion, and (3) the impact step were separately considered and their effects on structural changes of wood were studied. The SE experiments were performed on single wood pieces in different experimental set-ups at 7 and 14 bar pressure with 5 and 10 min treatment times. Mercury porosimetry and environmental scanning electron microscopy analyses were conducted to characterise both internal and external changes in the wood. It was found that the explosion step is not responsible for the disintegration of the wood material into small pieces; instead, the disintegration occurs due to impact of softened wood chips. However, the porosity profiles of the tracheids change during the explosion step. Altogether, all three steps of the SE process contribute in a synergistic way to an increase in pore size and total intrusion volume.

biorefinery

ESEM

steam explosion

Norway spruce

intrusion mercury porosimetry

Author

Muhammad Muzamal

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Environmental Science

Kerstin Jedvert

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Hans Theliander

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Wallenberg Wood Science Center (WWSC)

Anders Rasmuson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Environmental Science

Wallenberg Wood Science Center (WWSC)

Holzforschung

0018-3830 (ISSN) 1437-434X (eISSN)

Vol. 69 1 61-66

Subject Categories

Materials Engineering

DOI

10.1515/hf-2013-0234

More information

Latest update

8/27/2018