Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 7, Pages 4849-4854Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.01.018
Keywords
Hydrothermal pretreatment; Torrefaction; Lignocellulosic biomass; Equilibrium moisture content; Water activity
Funding
- US Department of Energy [DE-FG36-01GO11082]
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The equilibrium moisture content (EMC) of raw lignocellulosic biomass, along with four samples subjected to thermal pretreatment, was measured at relative humidities ranging from 11% to 97% at a constant temperature of 30 degrees C. Three samples were prepared by treatment in hot compressed water by a process known as wet torrefaction, at temperatures of 200, 230, and 260 degrees C. An additional sample was prepared by dry torrefaction at 300 degrees C. Pretreated biomass shows EMC below that of raw biomass. This indicates that pretreated biomass, both dry and wet torrefied, is more hydrophobic than raw biomass. The EMC results were correlated with a recent model that takes into account additional non-adsorption interactions of water, such as mixing and swelling. The model offers physical insight into the water activity in lignocellulosic biomass. (C) 2011 Elsevier Ltd. All rights reserved.
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