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以烧碱-蒽醌麦草浆为原料,分别采用二氧化氯、氯和氧进行单段漂白,对不同方法的漂白效果进行分析比较。结果表明:传统的氯化效果最差,脱木素率及处理后的纸浆白度、黏度和成纸强度是3种方法中最低的;氧气虽然脱木素能力强、纸浆白度高,但纸浆黏度低,漂白过程对纤维的损伤也较严重;二氧化氯具有较好的选择性,不仅能够有效脱除木素,而且保持了较高的黏度和成纸强度。麦草原料纤维细小、木素含量较低,因而在确定漂白方案时,首段采用二氧化氯漂白比较适宜,才能尽量减少漂白中对纤维的降解,使纸浆获得较高的机械强度。
The caustic soda-anthraquinone wheat straw pulp was used as raw material, single-stage bleaching was carried out with chlorine dioxide, chlorine and oxygen respectively, and the bleaching effects of different methods were analyzed and compared. The results showed that the traditional chlorination was the worst, and the delignification rate and pulp whiteness, viscosity and paper strength were the lowest among the three methods. Although the oxygen delignification ability and pulp whiteness were high, Pulp viscosity is low, bleaching process is more serious damage to the fiber; chlorine dioxide has a good selectivity, not only can effectively remove lignin, but also to maintain a high viscosity and paper strength. Wheat straw raw material fiber is small, lignin content is low, so in determining the bleaching program, the first paragraph of chlorine dioxide bleaching more appropriate to minimize the bleaching of fiber degradation, the pulp to obtain higher mechanical strength.