| 摘要 |
The present invention relates to a process of bleaching pulp derived from an alkaline pulping process having a hexenuronic acid content prior to the final bleaching stage from about 1 to about 80 mmol/kg dry pulp, said process comprising three chlorine 5 dioxide stages D0, D1, and D2, wherein the chlorine dioxide charges based on the total chlorine dioxide charge in a) D0 is from about 40 to about 60 %; b) D1 is from about 30 to about 55 %; c) D2 is from about 4 to about 20 %, and wherein the final chlorine dioxide stage D2 is 10 performed at a pH from about 2 to about 4.5. The invention also relates to a bleached pulp obtainable by the process. |
