| 摘要 |
A treatment sequence for paper pulp having a Kappa Number of 20 or less (e.g. 14 or less) may be AEopZ (the Z stage may be a (ZP) stage). The treatment sequence may be only the AEopZ sequence, or there can be an intervening ozone stage between the A and Eop stages, and/or subsequent oxidative treatment stages. During the A stage, or other metals removal stage, acid, chelating agent, and/or enzymes may be added. The Eop stage may be practised at superatmospheric pressure during at least part of the stage, at a temperature of 60-95 DEG C, with an oxygen charge of about 2-6 kg/adt and a H2O2 charge of about 10-20 kg/adt, and with a pH of 9-12, for 2-8 hours. |
