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.
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