木質バイオマス中の含水率が振動ロッドミル微粉砕物の特性に与える影響

摘要

本研究では，含水条件を変動させて木粉をロッドミル粉砕し，微粉砕木粉の各種特性を測定して以下の結論を得た。1.含水条件の違いにより，ロッドミル粉砕木粉のaセルロース含有率，80%エタノール水抽出物収率，結晶化度の3点について違いが見られた。2.含水条件の違いは，粉砕時の結晶化度の減少速度に影響を与えた。含水率7.9%以下の木粉は粉砕開始10分で結晶化度は0%まで低下する一方，含水率20.0%の木粉は粉砕開始から60分まで結晶化度は低下し，それ以降は約30%で安定した。%Mechano-chemical methods for modifying woody biomass proceed in the presence of liquid reagents. In this study, we investigated the effect of the moisture content of the woody biomass on the properties of milled wood flour. Japanese cedar chips conditioned to moisture contents of 0.0% to 20.0% were milled for 0 to 180 min using a high-speed vibration rod mill. We analyzed the wood flour to determine crystal-Unity, the contents of hollo-cellulose, alpha-cellulose, Klason lignin, and 80% ethanol aqueous extractive. Compared with wood chips with lower moisture contents, those with higher moisture contents produced milled wood flour with higher alpha-cellulose contents, higher crystallinities, and lower 80% ethanol aqueous extractives. For the wood chips with 20.0% moisture content, there was less decrease of crystallinity during milling, even when the milling time was longer than 60 min. The moisture content of the wood chips did not affect the hollo-cellulose and Klason lignin contents of the milled wood flour.