Comparison of Condensation Reactions of Lignin at Cα-Positionsin Kraft and Acid Sulfite Delignification of Western Hemlock
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概要
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Acid sulfite delignification of western hemlock(Tsuga heterophylla)was carried out from 90℃ to a final temperature of 145℃. Kraft pulping was also carried out from 90℃,but to a final temperature of 170℃. At various stages of delignification structual units condensed at Cα-positions in residual lignins weredetemined directly without isolating their lignins.In kraft pulping,the formation of structural units condensed at Cα-positions started at the point where about 50% of the lignin were removed. In acid sulfite pulping, the formation of those occurred when 65-70% of the lignin were removed. About 55% of the phenyl nuclei were found associated with condensed structures at Cα-positions in the residual lignins in both kraft and acid sulfite pulps having a kappa number about 35.Western hemlock のクラフトおよび酸性サルファイト蒸解過程におけるパルプ残留リグニンの構造変化を定量的に追跡した。リグニンベンシル位での縮合反応は, クラフト蒸解過程においてリグニン除去率約５０％の時点で開始したが, 一方酸性サルファイト蒸解では６５～７０％の時点で始まった。クラフトおよび酸性サルファイトいずれにおいても, パルプ（Kappa 価35）残留リグニンの芳香核の55％以上は側鎖α位縮合構造（ジフェニルメタン型構造単位)に取り込まれていた。
- Faculty of Bioresources, Mie Universityの論文
- 1991-01-31
Faculty of Bioresources, Mie University | 論文
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