公开(公告)号：US5368688A

公开(公告)日：1994-11-29

申请号：US62176

申请日：1993-05-17

申请人： Kouhei Miki ,  Takuya Yamamoto ,  Yoshiko Shishido ,  Mitsuhiro Mieno

发明人： Kouhei Miki ,  Takuya Yamamoto ,  Yoshiko Shishido ,  Mitsuhiro Mieno

IPC分类号： D21C9/153 ,  D21C9/18

CPC分类号： D21C9/153

摘要： A method for bleaching pulp with ozone and, more specifically, to a method for bleaching pulp without deterioration of pulp quality. The starting material is a medium consistency pulp with easy handling during transfer and dewatering, namely, pulp of a consistency of about 10% by weight to 20% by weight. During the initial stage of the ozone bleaching process, the reaction velocity is maintained higher, while during the latter stage of the bleaching process, cellulose attack is prevented. Specifically, pulp bleaching is done with ozone, while the pulp consistency during the bleaching process is lowered in a stepwise manner within the range for a medium consistency pulp. The decreasing of the pulp consistency in a stepwise manner during the bleaching process involves bleaching a pulp of a consistency within the range of about 10 to 20% by weight with ozone, subsequently dewatering the pulp and then diluting the pulp with water to provide a pulp consistency lower than the pulp consistency before dewatering, repeating the cycle composed of the dehydration, the diluting and the ozone bleaching steps one or more times, whereby the pulp consistency is lowered within the range of medium consistency in a stepwise manner.

摘要翻译： 一种用臭氧漂白纸浆的方法，更具体地说，涉及一种在不劣化纸浆质量的情况下漂白纸浆的方法。 起始材料是中等稠度纸浆，在转移和脱水过程中易于处理，即稠度为约10重量％至20重量％的纸浆。 在臭氧漂白过程的初始阶段，反应速度保持较高，而在漂白过程的后期阶段，可以防止纤维素侵袭。 具体地说，用臭氧进行纸浆漂白，而在漂白过程中纸浆的稠度在中等稠度纸浆的范围内以逐步的方式降低。 在漂白过程中以逐步方式减少纸浆稠度包括用约10至20重量％的臭氧将稠度浓度的纸浆漂白，然后使纸浆脱水，然后用水稀释纸浆以提供纸浆 一致性低于脱水前的纸浆稠度，重复由脱水，稀释和臭氧漂白步骤组成的循环一次或多次，由此纸浆稠度在中等稠度范围内逐步降低。