改善KP浆二氧化氯漂白性能的研究 第二部分:采用缓和酸处理改善桉木KP浆漂白性能

Improving Eucalyptus Urophylla Kraft Pulp Bleachability by Mild Acidic Treatment

在ECF漂前采用温和的酸水解 (最佳条件 pH =3,95℃ ,3h)可以除去尾叶桉纸浆中大部分的己烯糖醛酸基。AD0 EPD1 漂序比D0 EPD1 D2 漂序在达到相同的白度时 (88%ISO) ,节约二氧化氯 2 0 %～ 2 5%。漂白废水中的AOX含量可控制在 0 5kg/t绝干浆以下。

Hexenuronic acid groups(HuA) can be removed from the E.urophylla kraft pulp by mild acidic hydrolysis. The conditions recommended are treatment at pH 3 and 95℃ for 3h.In comparison to the bleaching sequences D 0E PD 1D 2,the AD 0E PD 1 sequences applied to E.urophylla kraft pulp can reduce the ClO 2 requirement by 20% to 25% for the same final brightness(88%ISO) and viscosity. AD 0E PD 1 sequences bleaching of EMCC pulps results in 88 2%ISO brightness at AOX of less than 0 5kg/o d t of pulp.