纸浆绿色漂白——二氧化氯漂白

摘要

Chlorine dioxide bleaching was one of the main bleaching stage in the ECF bleaching processes. It has been widely used in the multistage bleaching. Compared with chlorine dioxide bleaching, the production of AOX (adsorbable organic halides) in chlorine bleaching was more with the same and effective usage of chlorine. Chlorine dioxide has strong oxidation of strong delignification capacity and delignification selectivity. Using of buffer system in the process of C102 bleaching was better for the stability of pH value. In C102 bleaching process, amounts of AOX were reduced, because dimethyl sulfoxide (DMSO), hydrogen peroxide and NaC102 were added as bleaching additive agents. C102 production equipment nationalization, and flexible bleachin~ process is the trend of future develooment.%二氧化氯是ECF漂白工艺的主要漂白剂之一，已被应用于制浆厂的多段漂白。生产实践表明，在相同有效氯用量下，二氧化氯漂白产生的可吸附有机卤化物（AOX）仅为氯气漂白的1／5，而不影响脱木素。二氧化氯具有强氧化性，较强的脱木素能力和脱木素选择性。在C102漂白过程中，缓冲体系的建立有利于维持pH的稳定，二甲基亚砜（DMSO）、H202、NaC102等一些助剂减少了C102漂白过程中AOX的生成量。CIO2生产设备国有化、采用灵活多变的漂白工艺是今后发展的趋势。