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Effect of heat treatment on equilibrium moisture content of Southern pine

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131594244,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Manunya - Phanphanich, Tyler L Westover
Keywords:   Heat treatment Equilibrium moisture content wood torrefaction hygroscopicity storage stability biomass.

Abstract. Lowering of equilibrium moisture content is a significant benefit of thermal treatment of biomass. In this study, the equilibrium moisture content (EMC) of base-line and heat treated Southern pine wood (180, 230, and 270°C) was measured as a function of relative humidity over the range 22 to 85% at room temperature using a static gravimetric method (saturated salt slurry). Materials were prepared using a continuous-feed thermal reactor (capacity of 25 kg feed/hour). Six EMC models and their estimated parameters were evaluated for goodness-of-fit under the above range of conditions. Changes in wood composition as a function of thermal treatment temperature were investigated by the method of sequential detergent. EMC of wood increased with increase of relative humidity and decreased with increasing thermal treatment temperature. Degradation of hemicellulose and reduction of accessible hydroxyl groups from the heat treatment caused a decrease the ability of sample wood to bond with water.

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