【摘要】 研究了碱抽提强化的木聚糖酶处理对麦草浆二氧化氯漂白的助漂作用。结果显示:木聚糖酶预处理对ClO2脱木素的改善效果不明显,无论是脱木素前预处理(XD)还是脱木素后处理(DX),ClO2脱木素效率提高不大;采用XDP和DXP漂序,木聚糖酶对麦草浆ClO2漂白的助漂效果不明显,白度提高仅1.5个百分点左右,但可以节省H2O2用量25%～33.3%;采用XDEpP和DXEpP漂序,经H2O2强化的碱抽提Ep后,木聚糖酶对麦草浆ClO2漂白的助漂效果显著增强,与对照样相比,可以提高白度4.5个百分点,同样漂序采用木聚糖酶处理可节省ClO2用量17%～20%。纸浆滤液的紫外-可见吸收光谱分析表明,酶处理后所释放出的发色物质中含有木素或木素衍生物。更多还原

【Abstract】 The boosting effects of xylanase treatment intensified by caustic extraction on chlorine dioxide bleaching of wheat straw pulp were investigated. Results show that the improvement of chlorine dioxide delignification with xylanase treatment is not significant. The effectiveness of chlorine dioxide delignification is not increased distinctly whether by xylanase pretreatment prior-delignification (XD) or by xylanase treatment post-delignificatiion (DX). When XDP and DXP bleaching sequences are used, the boosting effect of xylanase is not significant. By applying XDP and DXP, the brightness is increased only as much as 1.5 points, while the consumption of hydrogen peroxide can be reduced by 25%～33.3%. With peroxide-intensified extraction (EP) and using XDEPP and DXEPP bleaching sequences, the boosting effectiveness of xylanase is increased significantly, with the final brightness raised by 4.5 points. With the same sequences, xylanase treated pulp can save the dosage of chlorine dioxide up to 17%～20%. The analysis of UV-VIS absorption spectroscopy of the chromophoric compounds in the filtrate, released by enzyme treatment, showed the presence of lignin or lignin-derived compounds in the released coloring matter.更多还原