| 摘要 |
PURPOSE:To improve a hydrolysis ratio of needle-leaf tree with an enzyme, by irradiating a cellulosic material with electron rays or gamma-rays, treating it with a halogen, delignifying it. CONSTITUTION:A cellulosic material consisting of needle-leaf tree such as pine, Japanese cedar, etc. is irradiated with 10<6>-10<8> rad electron rays or gamma-rays, immersed in an aqueous solution containing a halogen (e.g., Cl) or a halogen compound (e.g., hypochlorous acid), so that an aromatic nucleus of lignin is halogenated. The cellulosic material is then immersed in an alkali aqueous solution containing NaOH, KOH, NH3, etc. and delignified at >=100 deg.C.
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