| 摘要 |
PCT No. PCT/SE87/00467 Sec. 371 Date Jun. 20, 1988 Sec. 102(e) Date Jun. 20, 1988 PCT Filed Oct. 14, 1987 PCT Pub. No. WO88/02796 PCT Pub. Date Apr. 21, 1988.Method of peroxide bleaching of mechanical, thermomechanical and chemi-mechanical pulp wherein the peroxide bleaching is controlled by addition of a known amount of bleaching chemicals in the first stage which amount is allowed to react under defined conditions whereafter the brightness of the pulp after this first stage is used for control of a subsequent stage. In the first stage fresh chemicals, chemicals recirculated from a subsequent bleaching stage or a mixture of these is used. Hydrogen peroxide is the preferred bleaching agent but other peroxides can also be used. |
