| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing papermaking bleached pulp in which a pulp bleaching treatment is performed without using elementary chlorine and a chemical amount can be reduced than a conventional method to obtain high brightness pulp. <P>SOLUTION: A method for producing papermaking pulp is provided in which an alkaline oxygen bleaching is carried out for unbleached pulp obtained by digesting conifer, and then a chlorine dioxide bleaching stage-an alkaline hydrogen peroxide bleaching stage-an alkaline stage-an chlorine dioxide bleaching stage are carried out. The requirements for the alkaline stage are: a pulp concentration of 5-15%; a temperature of 40-80°C; a time of 10-180 minutes; and an alkaline addition rate of 0.01-0.2 mass% based on the amount of the pulp. <P>COPYRIGHT: (C)2012,JPO&INPIT |
