桉木预水解硫酸盐浆无元素氯漂白的研究

Elemental Chlorine-Free Bleaching Process for Eucalyptus Prehydrolysis Kraft Pulp

对桉木预水解硫酸盐浆无元素氯漂白方法进行了研究，并与少氯漂白方法比较。结果表明，Ｋａｐｐａ值为１２．２的未漂浆，用Ｏ－Ｄ１－Ｅ－Ｄ２－Ａ漂序，漂白浆的白度达到９３．１％ＳＢＤ；当用Ｏ－Ｄ１－Ｅ－Ｈ－Ｄ２－Ａ漂序时，浆的粘度低，废水ＢＯＤ５和ＣＯＤｃｒ含量升高；Ｋａｐｐａ值为７．４的未漂浆用Ｄ１－Ｅ－Ｄ２－Ａ漂序，可以把浆漂至９０．６％ＳＢＤ的白度。

Elemental chlorine-free bleaching of Eucalyptus prehydrolysis kraft pulp was studied and results were compared with minimum chlorine bleaching. The results indicated that the prehydrolysis kraft pulp with a Kappa No.of 12.2 could be bleached to a brightness of 93.1% SBD in a ODEDA sequence. When a ODEHDA sequence was used, the BOD5 and CODcr in the bleaching effluent were increased and the DP of the pulp suffered a decrease. The pulp with a Kappa No. of 7.4 could be bleached to 90.6% SBD brightness in a DEDA bleaching sequence.