| 摘要 |
The present invention relates to a process for bleaching of ligno-cellulosic pulp digested by a chemical process for reduced formation of chloro-organic compounds, while preserving the final brightness and strength properties of the pulp, by treating the pulp in a first stage with only chlorine dioxide at a charge factor of up to 2.0, whereupon the pulp is treated in an alkaline extraction stage reinforced with from 3.0 kg of hydrogen peroxide/ton of pulp. After the two-stage treatment the pulp can be finally bleached to the desired brightness in one or more chlorine dioxide stages. |
