EFFECT OF LIGNIN CONTENT ON DIRECT LIQUEFACTION OF BARK

The effect of lignin content on the direct liquefaction of bark was examined. Six kinds of barks having different lignin content were liquefied by a steam explosion method and an autoclave method. With increasing lignin content, the oil yield decreased and the char yield increased. The oil yield by the steam explosion method was higher than that by the autoclave method and the char yield by the former was lower than that by the latter. Although lignin leads to the formation of char by condensation or repolymerization, the steam explosion would retard the reaction.