| 摘要 |
PROBLEM TO BE SOLVED: To provide a production process for bleached pulp that can reduce the consumption of the bleaching chemicals in the production of the pulp bleached with ECF, in other words, by bleaching the pulp with a bleaching chemical free from chlorine and/or hypochlorous acid. SOLUTION: In the production of bleached pulp in which a lignocellulose material is cooked and the unbleached pulp is subjected to the oxidative bleaching, then to the multistep bleaching operation in the absence of elementary chlorine to produce the objective bleached pulp, the chlorine dioxide stage is provided on the first step and the immediately following step, that is followed by the extraction treatment under alkaline conditions and the treated pulp is additionally bleached.
|
