著者

芝本 武夫 栗山 旭

出版者

日本森林学会

雑誌

日本林學會誌 (ISSN:0021485X)

巻号頁・発行日

vol.32, no.2, pp.43-46, 1950

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The authors carried this study with woods of Quercus serrata Thunb.<br>containing various quantities of water, using iron retort of about 7 L. capacity. To obtain samples of various moisture contents, the woods were treated in three different ways, as follows;<br>(A) Woods were cut down and air-dried ud to such moisture contents as 40%, 30%, 25%, 10%, and less than 10% respectively.<br>(B) Air-dried wood of lower than 10% moisture content were dipped in water to absorb it fully and then air-dried again up to such moisture content as 40%, 30%, and 25%, respectively.<br>(C) Woods freschly cut down were soon dipped in water to absorb it fully.<br>The authors obtained the foollowing results in this study:<br>(1) In yields of the products of the destructive distillation on weight of the samples, charcoal, acids in distilled liquor (mostly acetic acid) and wood-gas (including loss) increased, and distilled liquor (including settled tar) decreased, according as moisture content of the samples decreased.<br>(2) But moisture content of the samples had not any effect on the yields of these products per weight of the absolutely dry samples.<br>(3) According as moisture content of the samples decreased, concentration of acids in distilled liquor increased.<br>(4) Volumetric gravity of charcoal was largest in the case of wood not air-dried after being cut down.(5) In the destructive distillation, water was distilled almost at 100&sim;150&deg;C in the retort, the wood was decomposed gradually at 150-250&deg;C and then temp-erature rised rapidly, much distilled liquor was run out, and much wood-gas was exhausted at 250-350&deg;C. The wood-gas was composed of CO₂ and CO for the most part at 150-300&deg;C, namely of about 60% CO₂ and 20-30 CO.