IMPROVED OXYGEN DELIGNIFICATION SELECTIVITY OF OIL PALM (ELAEIS GUINEENSIS) EFB SODA-AQ PULP: EFFECT OF PHOTO-PRETREATMENT AND AQ-AIDED H 2 O 2 REINFORCEMENT

Hui Yin, Soo Chong, Cheu Ng, Leh
2013 CELLULOSE CHEMISTRY AND TECHNOLOGY Cellulose Chem. Technol   unpublished
The kappa number (K n) reduction of oil palm empty fruit bunch (EFB) soda-anthraquinone (AQ) pulp by oxygen delignification was limited to only 34% to avoid substantial cellulose degradation. Thus, a preliminary study of photo-pretreatment was performed to improve the bleaching selectivity, and its effect was compared with the AQ-aided H 2 O 2 reinforced O-stage (O p-stage). The results showed that both methods performed better selectivity than the ordinary O-stage. It was suggested that the
more » ... ggested that the photo-treatment improved selectivity by diminishing carbonyl-induced carbohydrate degradation. Conversely, the AQ-aided O p-stage delivered higher delignifying power with minimum cellulose degradation. For pulps with the K n above 6.0, the effectiveness of both methods was about the same, but to achieve lower K n (5.8 and below), the AQ aided O p pulps exhibited better selectivity.
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