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首页> 外文期刊>Journal of Wood Chemistry and Technology >Soda Pulping of Hardwoods Catalyzed by Anthraquinone and Methyl Substituted Anthraquinones
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Soda Pulping of Hardwoods Catalyzed by Anthraquinone and Methyl Substituted Anthraquinones

机译：蒽醌和甲基取代的蒽醌催化的硬木苏打浆

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摘要

Black liquor gasification (BLG) as well as the recovery of lignin and other organic compounds from pulping black liquor would be aided if an efficient sulfur-free pulping process could be developed. This has provided new impetus for research on soda pulping with redox catalysts instead of sodium sulfide that is presently used in the kraft process. Soda/anthraquinone (AQ) pulping afforded white birch (Betula papyrifera) and sugar maple (Acer saccharum) pulps with equal if not superior strength to kraft pulps. However, the delignification rate was significantly lower for soda/AQ pulping. When AQ was replaced by 2-methylanthraquinone (2-MAQ) a delignification rate only slightly lower than that of kraft pulping was obtained at the same effective alkali (EA). At a kappa number of ～20, a soda/2-MAQ pulp was produced from sugar maple at a higher yield (1.2% on chips) than for a kraft pulp. 2-MAQ was synthesized, as a powder, at 75% yield using an AlCl_3-mediated Friedel-Crafts reaction that is one of the methods used for commercial production of AQ.
机译：如果可以开发一种有效的无硫制浆工艺，则将有助于黑液气化（BLG）以及从制浆黑液中回收木质素和其他有机化合物。这为研究用氧化还原催化剂代替目前牛皮纸工艺中使用的硫化钠制浆提供了新的动力。苏打/蒽醌（AQ）制浆获得的白桦木浆（Betula papyrifera）和糖枫木（Acer saccharum）浆粕的强度与牛皮纸浆强度相当甚至更高。但是，苏打/ AQ制浆的去木质素率明显较低。当用2-甲基蒽醌（2-MAQ）代替AQ时，在相同的有效碱（EA）下获得的脱木质素率仅略低于牛皮纸制浆。当卡伯值约为20时，由糖枫生产的苏打/ 2-MAQ纸浆比牛皮纸浆的产率高（碎屑为1.2％）。使用AlCl_3介导的Friedel-Crafts反应以75％的产率合成了粉末状的2-MAQ，这是用于AQ商业生产的方法之一。

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