Studies on carbonization of wood (X.)

Abstract

(1) The destructive distillations of the wood of Quercus glauca. THUNB., its methanol-lignin and its hydrochloric acid-lignin were carried out. (2) As acid, besides total acid, volatile acid was determined, differing from the previous paper. (3) The results on the distillation of the wood and the methanol-lignin were almost the same as those in the previous paper, and confirmed the facts reported before. Namely, (a) the yield of acid in the case of methanol-lignin was so little that lignin should not be the main source of acid in wood-distillation:(b) In the case of wood, the yield of acid in the fractions lower than 260° was high:(c) In the case of methanol-lignin, the amount of methoxyi group in the lower fractions was very high. (4) The content of volatile acid was approximately resembled that of total acid and unexpectedly high in the higher fractions. (5) In comparison of the results on the distillations of the methanol-lignin and the hydrochloric acid-lignin, the followings may be said. In acid, results on them were almost the same. The course of thermal decomposition was similar in both. In methoxyl group, its total distilled amount in the former was naturally very larger than in the latter, and in the change of methoxyl content, the former had a maximum in the lower fractions and the maximum in the higher fractions than 300° was well agreed in both. The residue of the former was a glossy black, porous and pitch-like lump while it of the latter was a non-glossy black powder. (6) The maximum of methoxyl content in lower fractions of methanol-lignin shifted to the slightly higher fractions than in the previous paper and this is of interest as it perhaps means that loosely combined methoxyl group was stabilized in the elapse of time. © 1952, THE JAPANESE FORESTRY SOCIETY. All rights reserved.