THERMOGRAVIMETRIC STUDIES ON CONDENSED WOOD RESIDUES IN POLYHYDRIC ALCOHOLS LIQUEFACTION

摘要: To further clarify reasons for formation of condensed residues during the last stage wood liquefaction in medium polyhydric alcohols and sulfuric acid catalyst, weight loss behaviors thermal reaction kinetics were studied by thermogravimetric analysis (TGA). Simultaneously, chemical methods used to analyze contents lignin, cellulose, holocellulose residues. For all unliquefied residues, cellulose decreased, residual ratios after TGA pyrolysis lignin increased as a function time. Moreover, highest rate went gradually higher temperature region time heating extended. The values apparent activation energy lower at 150 minutes 180 25 minutes. Liquefaction had smaller effect on mechanism, revealed TGA. In conclusion, stabilities than those decomposed wood. condensation occurred mainly liquefaction, resulted possibly from mutual among small molecules lignin.