阔叶木碱-蒽醌制浆的改进

Developing Soda-anthraquinone Pulping of Hardwood

介绍了糖槭木硫酸盐、碱-蒽醌、碱-α-甲基蒽醌法制浆,虽然碱-蒽醌蒸煮过程中脱木素作用明显低于硫酸盐蒸煮,但是,当用α-甲基蒽醌代替蒽醌,蒸煮过程中脱木素速率稍低于硫酸盐蒸煮。当有效碱用量相同时,由糖槭木生产碱-α-甲基蒽醌法浆,在纸浆卡伯值相同(约20)情况下,比硫酸盐浆得率增加1.2%(对绝干木片重量计),而这两种纸浆强度基本相同。采用AlCl3催化Friedel-crafts反应是一种工业生产蒽醌方法,用甲苯代替苯可以生产α-甲基蒽醌,而甲苯价格比苯便宜,因此,碱-α-甲基蒽醌法适合于生产阔叶木化学浆。

Ways of kraft, soda-anthraquinone（AQ） and soda-α-methyl anthraquinone（α-MAQ） process pulping of sugar maple are discussed. However, the delignifiaction rate was significantly lower for soda-AQ pulping. When AQ was replaced by α-MAQ a delignification rate only slightly lower than that of kraft pulping was obtained at the same effective alkali. At a kappa number of -20, a soda-α-MAQ pulp was produced from sugar maple at a higher yield（1.2% on chips） than for a kraft pulp. The both pulps strength was same. Using an AlCl3-catalyzed friedel crafts reaction that is one of the methods used for commercial production of AQ. Replacing benzene（AQ） with toluene（α-MAQ） for the synthesis of α-MAQ. Toluene is generally less expensive than benzene. Therefore, using soda-α-MAQ were quite impressive for hardwood alkaline pulping.