Research Article
Total Chlorine-Free Bleaching of Populus deltoides Kraft Pulp by Oxone
Table 2
Pulp properties after Oxone bleaching stages.
| | Bleaching sequences |
OX (%)
in different stages |
NaOH (%)
in different stages | pH |
Yield
(%) | Kappa number | Brightness | | 1st | 2nd | 1st | 2nd | Initial | Final |
| | AOX | 1 | — | 0.5 | — | 9.50 | 7.10 | 97.9 | 12.45 | 31.17 | | AOX | 3 | — | 1.5 | — | 10.74 | 8.34 | 97.1 | 8.85 | 37.43 | | AOX | 5 | — | 2.5 | — | 11.12 | 8.50 | 97.0 | 7.86 | 40.02 | | AOX | 7 | — | 3.5 | — | 11.35 | 9.15 | 96.6 | 7.65 | 39.91 | | AOX | 10 | — | 5.0 | — | 11.71 | 9.02 | 96.6 | 4.86 | 48.81 | | AOX1OX2 | 3 | 3 | 1.5 | 1.5 | 10.56 | 7.90 | 95.3 | 4.94 | 46.97 | | AOX1OX2 | 5 | 5 | 2.5 | 2.5 | 12.05 | 9.52 | 93.7 | 3.50 | 54.91 |
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