活化剂在麦草硫酸盐浆中无氯和少氯漂白中的应用

APPLICATION OF ACTIVATOR IN TCF AND LESSCHLORINEBLEACHING OF WHEAT STRAW KP PULP

在麦草ＫＰ浆的无氯和少氯漂白程序中使用活化剂，可促进脱木素作用并提高浆的白度。在氧脱木素前用ＮＯ２，硫酸和过氧酸进行预处理比较，以ＮＯ２效果最佳。ＮＯ２用量２％，处理后浆的卡伯值比未处理降低了６％，白度提高４％，粘度只下降１．６％。在Ｄ／ＣＥＤＤ漂白程序中，漂前用对有效氯用量８％的Ｓ１２预处理，白度提高２．３％ＩＳＤ，粘度基本无变化；活化剂ＴＡ用于ＮＯＰ三段漂的Ｐ段，用量４％（对浆），可提高白度４．３％ＩＳＯ，粘度也有明显提高。本试验采用ＧＯＰＡＰＴＡ无氯漂白程序，可使麦草ｋｐ浆漂后白度达８０％ＩＳＯ。

The activator can promote delignifacation and increase brightress of pulp in TCF and lesschlorine bleaching processes of wheat straw KP pulp.The results of pretreatment with nitrogen dioxide,sulfuric acid and preoxyacid to oxygen delignification show nitrogen dioxide is the best one.With 2% NO2 (onpulp).the kappa number decreases by 6% and viscosity decreases by 1.6% with brightness increase by 4 unit.Pretreatment with 8% of S12 (based on the actived chlorine in D/C EDD bleaching inproves brightness 2.3 unit without viscosity decrease.Pretreatment with 4% of TA in NOP bleaching improves brightness 4.3 unit with significant increase of viscosity.The brightness of 80% ISO can be achtived with GOPAPTA bleaching sequence but the viscosity decreases.)