抄録
The authors carried this study with woods of Quercus serrata Thunb. containing various quantities of water, usieg the Schrader's aluminium retort of aout 500 cc capacity. To obtain samples of various moisture contents, the woods were treated in the same way as formerly reported.
In this study, the suthors obtained the following results:
(1) Yields of the products of the destructive distillation on weight of fresh woods and the dried woods, and concentration of acetic acid in distilled liquor were the same in the case of the previous report.
(2) Volumetric gravity of charcoal was largest in the case of fresh wood not air-dried after being cut down and became smaller gradually according as moisture content of the wood decreased. But these facts were not obvious in the case of woods which were once air-dried up to lese than 10% in moisture content, and then dipped in water to absorb it and air-dried again.
(3) The course of the destructive distillation of wood could be divided into 4 stages distinctly. Water was distilled mostly at 150-200°C in the retort wall, distilled liquor and wood-gas were run out a little at 200-275°C, much at 275-300°C, and then distilled liquor again less and wood-gas comparatively much at 300-400°C.
(4) Distilled liquor at 250-400°C contained settled tar.
(5) Concentration of acetic acid was high in distilled liquor at 200-275°C but that of methanol was low. Methanol was contained much in the distillate at 275-350°C.
(6) So it would be supposed that in the former temperature range most of cellulose and in the latter temperature range most of lignin were decomposed.
