旧报纸浆过氧化尿素漂白工艺的探讨

摘要

The purpose of this paper was to study the influence of various parameters on the result of old newspaper pulp ( ONP) bleaching with urea peroxide and the compare urea peroxide bleaching and hydrogen peroxide bleaching. The main influence factors of urea peroxide bleaching including urea peroxide charge, temperature and reaction time were analyzed by response surface methodology. The bleaching conditions were optimized as urea peroxide dosage 12. 10% , Na2SiO3 3% ,MgSO4 0. 05% , reaction time 120 min, temperature 80℃. At the optimal conditions, pulp brightness reached 59.8% ISO and had 12.5 points gain compared with the unbleached pulp. The brightness of urea peroxide bleached pulp was 2. 6 points higher than that of the pulp bleached with hydrogen peroxide bleaching under the same condition.%以旧报纸浆为原料,用过氧化尿素对其进行漂白.采用响应面分析法对影响漂白的主要工艺条件包括过氧化尿素用量、温度和时间进行优化,并与H2O2漂白进行比较.研究结果表明,旧报纸浆过氧化尿素漂白的最佳工艺条件为:过氧化尿素用量12.10％,Na2 SiO3用量3％,MgSO4用量0.05％,时间120m in,温度80℃.在此工艺条件下,漂后浆白度为59.8％,比漂白前提高了12.5个百分点,优于相同实验条件下的H2O2漂白,过氧化尿素漂白浆的白度比H2O2漂白浆的高2.6个百分点.