3-4-4 半流通型2段階加圧熱水による稲わらの分解挙動(3-4 水熱・超臨界1,Session3 バイオマス等,研究発表)

概要

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Two-step hydrolysis of rice (Oryza sativa) straw, as one of the monocotyledonous angiosperms, was studied as treated by semi-flow hot-compressed water at 230℃/10MPa/15min (1^<st> stage) and 270℃/10MPa/30min (2^<nd> stage). In the 1^<st> stage, hemicellulose, pectin and para-crystalline cellulose, whose crystalline is somewhat disordered, were selectively hydrolyzed, as well as lignin being decomposed in part. In the 2^<nd> stage, hydrolysis of crystalline cellulose and some additional decomposition of lignin were observed. In addition, inorganic constituents and free neutral sugars such as xylose, arabinose, glucose and mannose were recovered in cold-water extraction (20℃/10MPa/30min) prior to the two-step hot-compressed water treatment. In total, 97.9% of oven-dried extractives-free rice straw sample could be solubilized into cold and hot-compressed water. Various products in the water-soluble portion were primarily recovered as saccharides (hydrolyzed moieties of the polyoses), which were later dehydrated, fragmented and isomerized partly. The residue (2.1%) after the treatment was composed mainly of lignin and silica.
2011-08-09