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Abstract
Thermal characteristics are described for acetosolv lignins, isolated after pulping bagasse with 90% and 70% acetic acid solution in presence or absence of 0.5% sulfuric acid as a catalyst. Tested lignins exhibited three well-developed TG waves and DTA peaks; their amplitude depends on the pulping conditions. Activity of the lignins was correlated with weight loss, DTA peaks, and activation energy. This followed the sequence: 90% acetosolv lignin > acetosolv lignins with sulfuric acid > 70% acetosolv lignin.