Thermal Behavior of Scots Pine (<i>Pinus Sylvestris</i>) and Silver Birch (<i>Betula Pendula</i>) at 200-230°
Keywords:Heat treatment, carbohydrates, lignin, extractives, <i>Pinus sylvestris</i>, <i>Betula pendula</i>
AbstractScots pine (Pinus sylvestris) and silver birch (Betula pendula) were heated for 4-8 h in a steam atmosphere at low temperatures (200-230°). The birch feedstock decomposed slightly more extensively (6.4-10.2 and 13.5-15.2% of the initial DS at 200° and 225°, respectively) than the pine feedstock (5.7-7.0 and 11.1-15.2% at 205° and 230°, respectively). The results indicated that the differences in mass loss between these feedstocks were due to mainly the fact that carbohydrates (cellulose and hemicelluloses) were more amenable to various degradation reactions than lignin in intact wood. The degradation reactions were also monitored in both cases by determining changes in the elemental composition of the heat-treated products.
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